ViewDistributedFileSystem (Apache Hadoop HDFS Client 3.4.1.100-eep-941 API)

java.lang.Object
- org.apache.hadoop.conf.Configured
- - org.apache.hadoop.fs.FileSystem
  - - org.apache.hadoop.hdfs.DistributedFileSystem
    - - org.apache.hadoop.hdfs.ViewDistributedFileSystem

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, org.apache.hadoop.conf.Configurable, org.apache.hadoop.crypto.key.KeyProviderTokenIssuer, org.apache.hadoop.fs.BatchListingOperations, org.apache.hadoop.fs.BulkDeleteSource, org.apache.hadoop.fs.LeaseRecoverable, org.apache.hadoop.fs.PathCapabilities, org.apache.hadoop.fs.SafeMode, org.apache.hadoop.security.token.DelegationTokenIssuer
```
@Private
@Unstable
public class ViewDistributedFileSystem
extends DistributedFileSystem
```
The ViewDistributedFileSystem is an extended class to DistributedFileSystem with additional mounting functionality. The goal is to have better API compatibility for HDFS users when using mounting filesystem(ViewFileSystemOverloadScheme). The ViewFileSystemOverloadSchemeViewFileSystemOverloadScheme is a new filesystem with inherited mounting functionality from ViewFileSystem. For the user who is using ViewFileSystemOverloadScheme by setting fs.hdfs.impl=org.apache.hadoop.fs.viewfs.ViewFileSystemOverloadScheme, now they can set fs.hdfs.impl=org.apache.hadoop.hdfs.ViewDistributedFileSystem. So, that the hdfs users will get closely compatible API with mount functionality. For the rest of all other schemes can continue to use ViewFileSystemOverloadScheme class directly for mount functionality. Please note that ViewFileSystemOverloadScheme provides only ViewFileSystemViewFileSystem APIs. If user configured this class but no mount point configured? Then it will simply work as existing DistributedFileSystem class. If user configured both fs.hdfs.impl to this class and mount configurations, then users will be able to make calls the APIs available in this class, they are nothing but DFS APIs, but they will be delegated to viewfs functionality. Please note, APIs without any path in arguments( ex: isInSafeMode), will be delegated to default filesystem only, that is the configured fallback link. If you want to make these API calls on specific child filesystem, you may want to initialize them separately and call. In ViewDistributedFileSystem, we strongly recommend to configure linkFallBack when you add mount links and it's recommended to point be to your base cluster, usually your current fs.defaultFS if that's pointing to hdfs.

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.hadoop.hdfs.DistributedFileSystem
  DistributedFileSystem.HdfsDataOutputStreamBuilder
- Nested classes/interfaces inherited from class org.apache.hadoop.fs.FileSystem
  org.apache.hadoop.fs.FileSystem.DirectoryEntries, org.apache.hadoop.fs.FileSystem.Statistics

Field Summary
- Fields inherited from class org.apache.hadoop.fs.FileSystem
  DEFAULT_FS, FS_DEFAULT_NAME_KEY, LOG, SHUTDOWN_HOOK_PRIORITY, statistics, TRASH_PREFIX, USER_HOME_PREFIX
- Fields inherited from interface org.apache.hadoop.security.token.DelegationTokenIssuer
  TOKEN_LOG

Constructor Summary

Constructors
Constructor Description

ViewDistributedFileSystem()

Constructors
Constructor	Description
`ViewDistributedFileSystem()`

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`access(org.apache.hadoop.fs.Path path, org.apache.hadoop.fs.permission.FsAction mode)`
`long`	`addCacheDirective(CacheDirectiveInfo info)`
`long`	`addCacheDirective(CacheDirectiveInfo info, java.util.EnumSet<CacheFlag> flags)`	Add a new CacheDirective.
`void`	`addCachePool(CachePoolInfo info)`	Add a cache pool.
`AddErasureCodingPolicyResponse[]`	`addErasureCodingPolicies(ErasureCodingPolicy[] policies)`	Add Erasure coding policies to HDFS.
`void`	`allowSnapshot(org.apache.hadoop.fs.Path path)`
`org.apache.hadoop.fs.FSDataOutputStream`	`append(org.apache.hadoop.fs.Path f, int bufferSize, org.apache.hadoop.util.Progressable progress)`
`org.apache.hadoop.fs.FSDataOutputStream`	`append(org.apache.hadoop.fs.Path f, java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> flag, int bufferSize, org.apache.hadoop.util.Progressable progress)`	Append to an existing file (optional operation).
`org.apache.hadoop.fs.FSDataOutputStream`	`append(org.apache.hadoop.fs.Path f, java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> flag, int bufferSize, org.apache.hadoop.util.Progressable progress, java.net.InetSocketAddress[] favoredNodes)`	Append to an existing file (optional operation).
`DistributedFileSystem.HdfsDataOutputStreamBuilder`	`appendFile(org.apache.hadoop.fs.Path path)`	Create a `DistributedFileSystem.HdfsDataOutputStreamBuilder` to append a file on DFS.
`org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.PartialListing<org.apache.hadoop.fs.LocatedFileStatus>>`	`batchedListLocatedStatusIterator(java.util.List<org.apache.hadoop.fs.Path> paths)`
`org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.PartialListing<org.apache.hadoop.fs.FileStatus>>`	`batchedListStatusIterator(java.util.List<org.apache.hadoop.fs.Path> paths)`
`protected java.net.URI`	`canonicalizeUri(java.net.URI uri)`
`void`	`close()`
`void`	`concat(org.apache.hadoop.fs.Path trg, org.apache.hadoop.fs.Path[] psrcs)`	Move blocks from srcs to trg and delete srcs afterwards.
`org.apache.hadoop.fs.FSDataOutputStream`	`create(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission permission, boolean overwrite, int bufferSize, short replication, long blockSize, org.apache.hadoop.util.Progressable progress)`
`HdfsDataOutputStream`	`create(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission permission, boolean overwrite, int bufferSize, short replication, long blockSize, org.apache.hadoop.util.Progressable progress, java.net.InetSocketAddress[] favoredNodes)`	Same as `DistributedFileSystem.create(Path, FsPermission, boolean, int, short, long, Progressable)` with the addition of favoredNodes that is a hint to where the namenode should place the file blocks.
`org.apache.hadoop.fs.FSDataOutputStream`	`create(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission permission, java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> cflags, int bufferSize, short replication, long blockSize, org.apache.hadoop.util.Progressable progress, org.apache.hadoop.fs.Options.ChecksumOpt checksumOpt)`
`void`	`createEncryptionZone(org.apache.hadoop.fs.Path path, java.lang.String keyName)`
`DistributedFileSystem.HdfsDataOutputStreamBuilder`	`createFile(org.apache.hadoop.fs.Path path)`	Create a HdfsDataOutputStreamBuilder to create a file on DFS.
`org.apache.hadoop.fs.FSDataOutputStream`	`createNonRecursive(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission permission, java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> flags, int bufferSize, short replication, long blockSize, org.apache.hadoop.util.Progressable progress)`	Same as create(), except fails if parent directory doesn't already exist.
`protected HdfsPathHandle`	`createPathHandle(org.apache.hadoop.fs.FileStatus st, org.apache.hadoop.fs.Options.HandleOpt... opts)`	Create a handle to an HDFS file.
`org.apache.hadoop.fs.Path`	`createSnapshot(org.apache.hadoop.fs.Path path, java.lang.String snapshotName)`
`void`	`createSymlink(org.apache.hadoop.fs.Path target, org.apache.hadoop.fs.Path link, boolean createParent)`
`boolean`	`delete(org.apache.hadoop.fs.Path f)`
`boolean`	`delete(org.apache.hadoop.fs.Path f, boolean recursive)`
`void`	`deleteSnapshot(org.apache.hadoop.fs.Path path, java.lang.String snapshotName)`
`void`	`disableErasureCodingPolicy(java.lang.String ecPolicyName)`	Disable erasure coding policy.
`void`	`disallowSnapshot(org.apache.hadoop.fs.Path path)`
`void`	`enableErasureCodingPolicy(java.lang.String ecPolicyName)`	Enable erasure coding policy.
`void`	`finalizeUpgrade()`	Finalize previously upgraded files system state.
`protected org.apache.hadoop.fs.Path`	`fixRelativePart(org.apache.hadoop.fs.Path p)`
`org.apache.hadoop.fs.permission.AclStatus`	`getAclStatus(org.apache.hadoop.fs.Path path)`
`org.apache.hadoop.security.token.DelegationTokenIssuer[]`	`getAdditionalTokenIssuers()`
`java.util.Map<java.lang.String,java.lang.String>`	`getAllErasureCodingCodecs()`	Retrieve all the erasure coding codecs and coders supported by this file system.
`java.util.Collection<ErasureCodingPolicyInfo>`	`getAllErasureCodingPolicies()`	Gets all erasure coding policies from all available child file systems.
`java.util.Collection<BlockStoragePolicy>`	`getAllStoragePolicies()`
`long`	`getBytesWithFutureGenerationStamps()`	Returns number of bytes within blocks with future generation stamp.
`java.lang.String`	`getCanonicalServiceName()`	Get a canonical service name for this file system.
`org.apache.hadoop.fs.FileSystem[]`	`getChildFileSystems()`
`DFSClient`	`getClient()`
`org.apache.hadoop.fs.ContentSummary`	`getContentSummary(org.apache.hadoop.fs.Path f)`
`long`	`getCorruptBlocksCount()`	Returns count of blocks with at least one replica marked corrupt.
`DatanodeInfo[]`	`getDataNodeStats()`
`DatanodeInfo[]`	`getDataNodeStats(HdfsConstants.DatanodeReportType type)`
`long`	`getDefaultBlockSize(org.apache.hadoop.fs.Path f)`
`protected int`	`getDefaultPort()`
`short`	`getDefaultReplication(org.apache.hadoop.fs.Path f)`
`org.apache.hadoop.security.token.Token<DelegationTokenIdentifier>`	`getDelegationToken(java.lang.String renewer)`	If no mount points configured, it works same as `DistributedFileSystem.getDelegationToken(String)`.
`ECTopologyVerifierResult`	`getECTopologyResultForPolicies(java.lang.String... policyNames)`	Verifies if the given policies are supported in the given cluster setup.
`ErasureCodingPolicy`	`getErasureCodingPolicy(org.apache.hadoop.fs.Path path)`	Get erasure coding policy information for the specified path.
`EncryptionZone`	`getEZForPath(org.apache.hadoop.fs.Path path)`
`org.apache.hadoop.fs.BlockLocation[]`	`getFileBlockLocations(org.apache.hadoop.fs.FileStatus fs, long start, long len)`
`org.apache.hadoop.fs.BlockLocation[]`	`getFileBlockLocations(org.apache.hadoop.fs.Path p, long start, long len)`	The returned BlockLocation will have different formats for replicated and erasure coded file.
`org.apache.hadoop.fs.FileChecksum`	`getFileChecksum(org.apache.hadoop.fs.Path f)`
`org.apache.hadoop.fs.FileChecksum`	`getFileChecksum(org.apache.hadoop.fs.Path f, long length)`
`org.apache.hadoop.fs.FileEncryptionInfo`	`getFileEncryptionInfo(org.apache.hadoop.fs.Path path)`
`org.apache.hadoop.fs.FileStatus`	`getFileLinkStatus(org.apache.hadoop.fs.Path f)`
`org.apache.hadoop.fs.FileStatus`	`getFileStatus(org.apache.hadoop.fs.Path f)`	Returns the stat information about the file.
`DFSHedgedReadMetrics`	`getHedgedReadMetrics()`	Returns only default cluster getHedgedReadMetrics.
`org.apache.hadoop.fs.Path`	`getHomeDirectory()`
`DFSInotifyEventInputStream`	`getInotifyEventStream()`
`DFSInotifyEventInputStream`	`getInotifyEventStream(long lastReadTxid)`
`org.apache.hadoop.crypto.key.KeyProvider`	`getKeyProvider()`
`java.net.URI`	`getKeyProviderUri()`
`org.apache.hadoop.fs.Path`	`getLinkTarget(org.apache.hadoop.fs.Path path)`
`long`	`getLowRedundancyBlocksCount()`	Returns aggregated count of blocks with less redundancy.
`long`	`getMissingBlocksCount()`	Returns count of blocks with no good replicas left.
`long`	`getMissingReplOneBlocksCount()`	Returns count of blocks with replication factor 1 and have lost the only replica.
`org.apache.hadoop.fs.viewfs.ViewFileSystem.MountPoint[]`	`getMountPoints()`
`long`	`getPendingDeletionBlocksCount()`	Returns count of blocks pending on deletion.
`org.apache.hadoop.fs.QuotaUsage`	`getQuotaUsage(org.apache.hadoop.fs.Path f)`
`java.lang.String`	`getScheme()`	Return the protocol scheme for the FileSystem.
`org.apache.hadoop.fs.FsServerDefaults`	`getServerDefaults()`
`org.apache.hadoop.fs.FsServerDefaults`	`getServerDefaults(org.apache.hadoop.fs.Path f)`
`DatanodeInfo[]`	`getSlowDatanodeStats()`	Retrieve stats for slow running datanodes.
`SnapshotDiffReport`	`getSnapshotDiffReport(org.apache.hadoop.fs.Path snapshotDir, java.lang.String fromSnapshot, java.lang.String toSnapshot)`	Get the difference between two snapshots, or between a snapshot and the current tree of a directory.
`SnapshottableDirectoryStatus[]`	`getSnapshottableDirListing()`	Get the list of snapshottable directories that are owned by the current user.
`org.apache.hadoop.fs.FsStatus`	`getStatus()`
`org.apache.hadoop.fs.FsStatus`	`getStatus(org.apache.hadoop.fs.Path p)`
`BlockStoragePolicy[]`	`getStoragePolicies()`	Deprecated.
`org.apache.hadoop.fs.BlockStoragePolicySpi`	`getStoragePolicy(org.apache.hadoop.fs.Path src)`
`org.apache.hadoop.fs.Path`	`getTrashRoot(org.apache.hadoop.fs.Path path)`	Get the root directory of Trash for a path in HDFS.
`java.util.Collection<org.apache.hadoop.fs.FileStatus>`	`getTrashRoots(boolean allUsers)`	Get all the trash roots of HDFS for current user or for all the users.
`java.net.URI`	`getUri()`
`long`	`getUsed()`
`org.apache.hadoop.fs.Path`	`getWorkingDirectory()`
`byte[]`	`getXAttr(org.apache.hadoop.fs.Path path, java.lang.String name)`
`java.util.Map<java.lang.String,byte[]>`	`getXAttrs(org.apache.hadoop.fs.Path path)`
`java.util.Map<java.lang.String,byte[]>`	`getXAttrs(org.apache.hadoop.fs.Path path, java.util.List<java.lang.String> names)`
`boolean`	`hasPathCapability(org.apache.hadoop.fs.Path path, java.lang.String capability)`	HDFS client capabilities.
`void`	`initialize(java.net.URI uri, org.apache.hadoop.conf.Configuration conf)`
`boolean`	`isFileClosed(org.apache.hadoop.fs.Path src)`	Get the close status of a file
`boolean`	`isInSafeMode()`	Utility function that returns if the NameNode is in safemode or not.
`org.apache.hadoop.fs.RemoteIterator<CacheDirectiveEntry>`	`listCacheDirectives(CacheDirectiveInfo filter)`	List cache directives.
`org.apache.hadoop.fs.RemoteIterator<CachePoolEntry>`	`listCachePools()`	List all cache pools.
`org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.Path>`	`listCorruptFileBlocks(org.apache.hadoop.fs.Path path)`
`org.apache.hadoop.fs.RemoteIterator<EncryptionZone>`	`listEncryptionZones()`	Returns the results from default DFS (fallback).
`org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.LocatedFileStatus>`	`listLocatedStatus(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.PathFilter filter)`	The BlockLocation of returned LocatedFileStatus will have different formats for replicated and erasure coded file.
`org.apache.hadoop.fs.RemoteIterator<OpenFileEntry>`	`listOpenFiles()`	Deprecated.
`org.apache.hadoop.fs.RemoteIterator<OpenFileEntry>`	`listOpenFiles(java.util.EnumSet<OpenFilesIterator.OpenFilesType> openFilesTypes)`	Deprecated.
`org.apache.hadoop.fs.RemoteIterator<OpenFileEntry>`	`listOpenFiles(java.util.EnumSet<OpenFilesIterator.OpenFilesType> openFilesTypes, java.lang.String path)`
`org.apache.hadoop.fs.RemoteIterator<ZoneReencryptionStatus>`	`listReencryptionStatus()`	Returns the results from default DFS (fallback).
`org.apache.hadoop.fs.FileStatus[]`	`listStatus(org.apache.hadoop.fs.Path p)`	List all the entries of a directory Note that this operation is not atomic for a large directory.
`org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.FileStatus>`	`listStatusIterator(org.apache.hadoop.fs.Path p)`	Returns a remote iterator so that followup calls are made on demand while consuming the entries.
`java.util.List<java.lang.String>`	`listXAttrs(org.apache.hadoop.fs.Path path)`
`void`	`metaSave(java.lang.String pathname)`
`boolean`	`mkdir(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission permission)`	Create a directory, only when the parent directories exist.
`boolean`	`mkdirs(org.apache.hadoop.fs.Path dir)`
`boolean`	`mkdirs(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission permission)`	Create a directory and its parent directories.
`void`	`modifyAclEntries(org.apache.hadoop.fs.Path path, java.util.List<org.apache.hadoop.fs.permission.AclEntry> aclSpec)`
`void`	`modifyCacheDirective(CacheDirectiveInfo info)`
`void`	`modifyCacheDirective(CacheDirectiveInfo info, java.util.EnumSet<CacheFlag> flags)`	Modify a CacheDirective.
`void`	`modifyCachePool(CachePoolInfo info)`	Modify an existing cache pool.
`org.apache.hadoop.fs.FSDataInputStream`	`open(org.apache.hadoop.fs.PathHandle fd, int bufferSize)`	Opens an FSDataInputStream with the indicated file ID extracted from the `PathHandle`.
`org.apache.hadoop.fs.FSDataInputStream`	`open(org.apache.hadoop.fs.Path f, int bufferSize)`
`protected HdfsDataOutputStream`	`primitiveCreate(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission absolutePermission, java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> flag, int bufferSize, short replication, long blockSize, org.apache.hadoop.util.Progressable progress, org.apache.hadoop.fs.Options.ChecksumOpt checksumOpt)`
`protected boolean`	`primitiveMkdir(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission absolutePermission)`
`void`	`provisionEZTrash(org.apache.hadoop.fs.Path path, org.apache.hadoop.fs.permission.FsPermission trashPermission)`
`org.apache.hadoop.fs.Path`	`provisionSnapshotTrash(org.apache.hadoop.fs.Path path, org.apache.hadoop.fs.permission.FsPermission trashPermission)`	HDFS only.
`boolean`	`recoverLease(org.apache.hadoop.fs.Path f)`	Start the lease recovery of a file
`void`	`reencryptEncryptionZone(org.apache.hadoop.fs.Path zone, HdfsConstants.ReencryptAction action)`
`void`	`refreshNodes()`	Refreshes the list of hosts and excluded hosts from the configured files.
`void`	`removeAcl(org.apache.hadoop.fs.Path path)`
`void`	`removeAclEntries(org.apache.hadoop.fs.Path path, java.util.List<org.apache.hadoop.fs.permission.AclEntry> aclSpec)`
`void`	`removeCacheDirective(long id)`	Remove a CacheDirectiveInfo.
`void`	`removeCachePool(java.lang.String poolName)`	Remove a cache pool.
`void`	`removeDefaultAcl(org.apache.hadoop.fs.Path path)`
`void`	`removeErasureCodingPolicy(java.lang.String ecPolicyName)`	Remove erasure coding policy.
`void`	`removeXAttr(org.apache.hadoop.fs.Path path, java.lang.String name)`
`boolean`	`rename(org.apache.hadoop.fs.Path src, org.apache.hadoop.fs.Path dst)`
`void`	`rename(org.apache.hadoop.fs.Path src, org.apache.hadoop.fs.Path dst, org.apache.hadoop.fs.Options.Rename... options)`	This rename operation is guaranteed to be atomic.
`void`	`renameSnapshot(org.apache.hadoop.fs.Path path, java.lang.String snapshotOldName, java.lang.String snapshotNewName)`
`protected org.apache.hadoop.fs.Path`	`resolveLink(org.apache.hadoop.fs.Path f)`
`org.apache.hadoop.fs.Path`	`resolvePath(org.apache.hadoop.fs.Path f)`
`boolean`	`restoreFailedStorage(java.lang.String arg)`	enable/disable/check restoreFaileStorage.
`long`	`rollEdits()`	Rolls the edit log on the active NameNode.
`RollingUpgradeInfo`	`rollingUpgrade(HdfsConstants.RollingUpgradeAction action)`	Rolling upgrade: prepare/finalize/query.
`void`	`satisfyStoragePolicy(org.apache.hadoop.fs.Path src)`	Set the source path to satisfy storage policy.
`void`	`saveNamespace()`	Save namespace image.
`boolean`	`saveNamespace(long timeWindow, long txGap)`	Save namespace image.
`void`	`setAcl(org.apache.hadoop.fs.Path path, java.util.List<org.apache.hadoop.fs.permission.AclEntry> aclSpec)`
`void`	`setBalancerBandwidth(long bandwidth)`	Requests the namenode to tell all datanodes to use a new, non-persistent bandwidth value for dfs.datanode.balance.bandwidthPerSec.
`void`	`setErasureCodingPolicy(org.apache.hadoop.fs.Path path, java.lang.String ecPolicyName)`	Set the source path to the specified erasure coding policy.
`void`	`setOwner(org.apache.hadoop.fs.Path f, java.lang.String username, java.lang.String groupname)`
`void`	`setPermission(org.apache.hadoop.fs.Path f, org.apache.hadoop.fs.permission.FsPermission permission)`
`void`	`setQuota(org.apache.hadoop.fs.Path src, long namespaceQuota, long storagespaceQuota)`	Set a directory's quotas
`void`	`setQuotaByStorageType(org.apache.hadoop.fs.Path src, org.apache.hadoop.fs.StorageType type, long quota)`	Set the per type storage quota of a directory.
`boolean`	`setReplication(org.apache.hadoop.fs.Path f, short replication)`
`boolean`	`setSafeMode(HdfsConstants.SafeModeAction action)`	Enter, leave or get safe mode.
`boolean`	`setSafeMode(HdfsConstants.SafeModeAction action, boolean isChecked)`	Enter, leave or get safe mode.
`void`	`setStoragePolicy(org.apache.hadoop.fs.Path src, java.lang.String policyName)`	Set the source path to the specified storage policy.
`void`	`setTimes(org.apache.hadoop.fs.Path f, long mtime, long atime)`
`void`	`setVerifyChecksum(boolean verifyChecksum)`
`void`	`setWorkingDirectory(org.apache.hadoop.fs.Path dir)`
`void`	`setWriteChecksum(boolean writeChecksum)`
`void`	`setXAttr(org.apache.hadoop.fs.Path path, java.lang.String name, byte[] value, java.util.EnumSet<org.apache.hadoop.fs.XAttrSetFlag> flag)`
`org.apache.hadoop.fs.RemoteIterator<SnapshotDiffReportListing>`	`snapshotDiffReportListingRemoteIterator(org.apache.hadoop.fs.Path snapshotDir, java.lang.String fromSnapshot, java.lang.String toSnapshot)`	Returns a remote iterator so that followup calls are made on demand while consuming the SnapshotDiffReportListing entries.
`boolean`	`supportsSymlinks()`
`boolean`	`truncate(org.apache.hadoop.fs.Path f, long newLength)`
`void`	`unsetErasureCodingPolicy(org.apache.hadoop.fs.Path path)`	Unset the erasure coding policy from the source path.
`void`	`unsetStoragePolicy(org.apache.hadoop.fs.Path src)`
`boolean`	`upgradeStatus()`	Get status of upgrade - finalized or not.

Methods inherited from class org.apache.hadoop.hdfs.DistributedFileSystem
append, createMultipartUploader, getDefaultBlockSize, getDefaultReplication, getEnclosingRoot, getLocatedBlocks, getSnapshotDiffReportListing, getSnapshotListing, isSnapshotTrashRootEnabled, msync, setSafeMode, setSafeMode, toString

Methods inherited from class org.apache.hadoop.fs.FileSystem
append, append, append, areSymlinksEnabled, cancelDeleteOnExit, checkPath, clearStatistics, closeAll, closeAllForUGI, completeLocalOutput, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, create, createBulkDelete, createDataInputStreamBuilder, createDataInputStreamBuilder, createDataOutputStreamBuilder, createFid, createNewFile, createNonRecursive, createNonRecursive, createPathId, createSnapshot, deleteFid, deleteOnExit, enableSymlinks, exists, get, get, get, getAllStatistics, getBlockSize, getCanonicalUri, getDefaultUri, getFileSystemClass, getFSofPath, getGlobalStorageStatistics, getInitialWorkingDirectory, getJobTrackerAddrs, getLength, getLocal, getName, getNamed, getPathHandle, getReplication, getStatistics, getStatistics, getStorageStatistics, getUsed, getZkConnectString, globStatus, globStatus, isDirectory, isFile, listFiles, listLocatedStatus, listStatus, listStatus, listStatus, listStatusBatch, makeQualified, mkdirs, mkdirsFid, mkdirsFid, moveFromLocalFile, moveFromLocalFile, moveToLocalFile, newInstance, newInstance, newInstance, newInstanceLocal, open, open, openFid, openFid, openFid2, openFile, openFile, openFileWithOptions, openFileWithOptions, primitiveMkdir, printStatistics, processDeleteOnExit, setDefaultUri, setDefaultUri, setOwnerFid, setXAttr, startLocalOutput

Methods inherited from class org.apache.hadoop.conf.Configured
getConf, setConf

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.hadoop.security.token.DelegationTokenIssuer
addDelegationTokens

- Constructor Detail
  - ViewDistributedFileSystem
```
public ViewDistributedFileSystem()
```
- Method Detail
  - initialize
```
public void initialize(java.net.URI uri,
                       org.apache.hadoop.conf.Configuration conf)
                throws java.io.IOException
```
    Overrides:
    
    initialize in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getUri
```
public java.net.URI getUri()
```
    Overrides:
    
    getUri in class DistributedFileSystem
  - getScheme
```
public java.lang.String getScheme()
```
    Description copied from class: DistributedFileSystem
    
    Return the protocol scheme for the FileSystem.
    
    Overrides:
    
    getScheme in class DistributedFileSystem
    
    Returns:
    
    hdfs
  - getWorkingDirectory
```
public org.apache.hadoop.fs.Path getWorkingDirectory()
```
    Overrides:
    
    getWorkingDirectory in class DistributedFileSystem
  - setWorkingDirectory
```
public void setWorkingDirectory(org.apache.hadoop.fs.Path dir)
```
    Overrides:
    
    setWorkingDirectory in class DistributedFileSystem
  - getHomeDirectory
```
public org.apache.hadoop.fs.Path getHomeDirectory()
```
    Overrides:
    
    getHomeDirectory in class DistributedFileSystem
  - getHedgedReadMetrics
```
public DFSHedgedReadMetrics getHedgedReadMetrics()
```
    Returns only default cluster getHedgedReadMetrics.
    
    Overrides:
    
    getHedgedReadMetrics in class DistributedFileSystem
    
    Returns:
    
    object of DFSHedgedReadMetrics
  - getFileBlockLocations
```
public org.apache.hadoop.fs.BlockLocation[] getFileBlockLocations(org.apache.hadoop.fs.FileStatus fs,
                                                                  long start,
                                                                  long len)
                                                           throws java.io.IOException
```
    Overrides:
    
    getFileBlockLocations in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getFileBlockLocations
```
public org.apache.hadoop.fs.BlockLocation[] getFileBlockLocations(org.apache.hadoop.fs.Path p,
                                                                  long start,
                                                                  long len)
                                                           throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    The returned BlockLocation will have different formats for replicated and erasure coded file. Please refer to FileSystem.getFileBlockLocations(FileStatus, long, long) for more details.
    
    Overrides:
    
    getFileBlockLocations in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - setVerifyChecksum
```
public void setVerifyChecksum(boolean verifyChecksum)
```
    Overrides:
    
    setVerifyChecksum in class DistributedFileSystem
  - recoverLease
```
public boolean recoverLease(org.apache.hadoop.fs.Path f)
                     throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Start the lease recovery of a file
    
    Specified by:
    
    recoverLease in interface org.apache.hadoop.fs.LeaseRecoverable
    
    Overrides:
    
    recoverLease in class DistributedFileSystem
    
    Parameters:
    
    f - a file
    
    Returns:
    
    true if the file is already closed
    
    Throws:
    
    java.io.IOException - if an error occurs
  - open
```
public org.apache.hadoop.fs.FSDataInputStream open(org.apache.hadoop.fs.Path f,
                                                   int bufferSize)
                                            throws org.apache.hadoop.security.AccessControlException,
                                                   java.io.FileNotFoundException,
                                                   java.io.IOException
```
    Overrides:
    
    open in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - open
```
public org.apache.hadoop.fs.FSDataInputStream open(org.apache.hadoop.fs.PathHandle fd,
                                                   int bufferSize)
                                            throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Opens an FSDataInputStream with the indicated file ID extracted from the PathHandle.
    
    Overrides:
    
    open in class DistributedFileSystem
    
    Parameters:
    
    fd - Reference to entity in this FileSystem.
    
    bufferSize - the size of the buffer to be used.
    
    Throws:
    
    org.apache.hadoop.fs.InvalidPathHandleException - If PathHandle constraints do not hold
    
    java.io.IOException - On I/O errors
  - createPathHandle
```
protected HdfsPathHandle createPathHandle(org.apache.hadoop.fs.FileStatus st,
                                          org.apache.hadoop.fs.Options.HandleOpt... opts)
```
    Description copied from class: DistributedFileSystem
    
    Create a handle to an HDFS file.
    
    Overrides:
    
    createPathHandle in class DistributedFileSystem
    
    Parameters:
    
    st - HdfsFileStatus instance from NameNode
    
    opts - Standard handle arguments
    
    Returns:
    
    A handle to the file.
  - append
```
public org.apache.hadoop.fs.FSDataOutputStream append(org.apache.hadoop.fs.Path f,
                                                      int bufferSize,
                                                      org.apache.hadoop.util.Progressable progress)
                                               throws java.io.IOException
```
    Overrides:
    
    append in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - append
```
public org.apache.hadoop.fs.FSDataOutputStream append(org.apache.hadoop.fs.Path f,
                                                      java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> flag,
                                                      int bufferSize,
                                                      org.apache.hadoop.util.Progressable progress)
                                               throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Append to an existing file (optional operation).
    
    Overrides:
    
    append in class DistributedFileSystem
    
    Parameters:
    
    f - the existing file to be appended.
    
    flag - Flags for the Append operation. CreateFlag.APPEND is mandatory to be present.
    
    bufferSize - the size of the buffer to be used.
    
    progress - for reporting progress if it is not null.
    
    Returns:
    
    Returns instance of FSDataOutputStream
    
    Throws:
    
    java.io.IOException
  - append
```
public org.apache.hadoop.fs.FSDataOutputStream append(org.apache.hadoop.fs.Path f,
                                                      java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> flag,
                                                      int bufferSize,
                                                      org.apache.hadoop.util.Progressable progress,
                                                      java.net.InetSocketAddress[] favoredNodes)
                                               throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Append to an existing file (optional operation).
    
    Overrides:
    
    append in class DistributedFileSystem
    
    Parameters:
    
    f - the existing file to be appended.
    
    flag - Flags for the Append operation. CreateFlag.APPEND is mandatory to be present.
    
    bufferSize - the size of the buffer to be used.
    
    progress - for reporting progress if it is not null.
    
    favoredNodes - Favored nodes for new blocks
    
    Returns:
    
    Returns instance of FSDataOutputStream
    
    Throws:
    
    java.io.IOException
  - create
```
public org.apache.hadoop.fs.FSDataOutputStream create(org.apache.hadoop.fs.Path f,
                                                      org.apache.hadoop.fs.permission.FsPermission permission,
                                                      boolean overwrite,
                                                      int bufferSize,
                                                      short replication,
                                                      long blockSize,
                                                      org.apache.hadoop.util.Progressable progress)
                                               throws java.io.IOException
```
    Overrides:
    
    create in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - create
```
public HdfsDataOutputStream create(org.apache.hadoop.fs.Path f,
                                   org.apache.hadoop.fs.permission.FsPermission permission,
                                   boolean overwrite,
                                   int bufferSize,
                                   short replication,
                                   long blockSize,
                                   org.apache.hadoop.util.Progressable progress,
                                   java.net.InetSocketAddress[] favoredNodes)
                            throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Same as DistributedFileSystem.create(Path, FsPermission, boolean, int, short, long, Progressable) with the addition of favoredNodes that is a hint to where the namenode should place the file blocks. The favored nodes hint is not persisted in HDFS. Hence it may be honored at the creation time only. And with favored nodes, blocks will be pinned on the datanodes to prevent balancing move the block. HDFS could move the blocks during replication, to move the blocks from favored nodes. A value of null means no favored nodes for this create
    
    Overrides:
    
    create in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - create
```
public org.apache.hadoop.fs.FSDataOutputStream create(org.apache.hadoop.fs.Path f,
                                                      org.apache.hadoop.fs.permission.FsPermission permission,
                                                      java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> cflags,
                                                      int bufferSize,
                                                      short replication,
                                                      long blockSize,
                                                      org.apache.hadoop.util.Progressable progress,
                                                      org.apache.hadoop.fs.Options.ChecksumOpt checksumOpt)
                                               throws java.io.IOException
```
    Overrides:
    
    create in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - primitiveCreate
```
protected HdfsDataOutputStream primitiveCreate(org.apache.hadoop.fs.Path f,
                                               org.apache.hadoop.fs.permission.FsPermission absolutePermission,
                                               java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> flag,
                                               int bufferSize,
                                               short replication,
                                               long blockSize,
                                               org.apache.hadoop.util.Progressable progress,
                                               org.apache.hadoop.fs.Options.ChecksumOpt checksumOpt)
                                        throws java.io.IOException
```
    Overrides:
    
    primitiveCreate in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - createNonRecursive
```
public org.apache.hadoop.fs.FSDataOutputStream createNonRecursive(org.apache.hadoop.fs.Path f,
                                                                  org.apache.hadoop.fs.permission.FsPermission permission,
                                                                  java.util.EnumSet<org.apache.hadoop.fs.CreateFlag> flags,
                                                                  int bufferSize,
                                                                  short replication,
                                                                  long blockSize,
                                                                  org.apache.hadoop.util.Progressable progress)
                                                           throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Same as create(), except fails if parent directory doesn't already exist.
    
    Overrides:
    
    createNonRecursive in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - setReplication
```
public boolean setReplication(org.apache.hadoop.fs.Path f,
                              short replication)
                       throws org.apache.hadoop.security.AccessControlException,
                              java.io.FileNotFoundException,
                              java.io.IOException
```
    Overrides:
    
    setReplication in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - setStoragePolicy
```
public void setStoragePolicy(org.apache.hadoop.fs.Path src,
                             java.lang.String policyName)
                      throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Set the source path to the specified storage policy.
    
    Overrides:
    
    setStoragePolicy in class DistributedFileSystem
    
    Parameters:
    
    src - The source path referring to either a directory or a file.
    
    policyName - The name of the storage policy.
    
    Throws:
    
    java.io.IOException
  - unsetStoragePolicy
```
public void unsetStoragePolicy(org.apache.hadoop.fs.Path src)
                        throws java.io.IOException
```
    Overrides:
    
    unsetStoragePolicy in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getStoragePolicy
```
public org.apache.hadoop.fs.BlockStoragePolicySpi getStoragePolicy(org.apache.hadoop.fs.Path src)
                                                            throws java.io.IOException
```
    Overrides:
    
    getStoragePolicy in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getAllStoragePolicies
```
public java.util.Collection<BlockStoragePolicy> getAllStoragePolicies()
                                                               throws java.io.IOException
```
    Overrides:
    
    getAllStoragePolicies in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getBytesWithFutureGenerationStamps
```
public long getBytesWithFutureGenerationStamps()
                                        throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns number of bytes within blocks with future generation stamp. These are bytes that will be potentially deleted if we forceExit from safe mode.
    
    Overrides:
    
    getBytesWithFutureGenerationStamps in class DistributedFileSystem
    
    Returns:
    
    number of bytes.
    
    Throws:
    
    java.io.IOException
  - getStoragePolicies
```
@Deprecated
public BlockStoragePolicy[] getStoragePolicies()
                                        throws java.io.IOException
```
    Deprecated.
    
    Description copied from class: DistributedFileSystem
    
    Deprecated. Prefer FileSystem.getAllStoragePolicies()
    
    Overrides:
    
    getStoragePolicies in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - concat
```
public void concat(org.apache.hadoop.fs.Path trg,
                   org.apache.hadoop.fs.Path[] psrcs)
            throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Move blocks from srcs to trg and delete srcs afterwards. The file block sizes must be the same.
    
    Overrides:
    
    concat in class DistributedFileSystem
    
    Parameters:
    
    trg - existing file to append to
    
    psrcs - list of files (same block size, same replication)
    
    Throws:
    
    java.io.IOException
  - rename
```
public boolean rename(org.apache.hadoop.fs.Path src,
                      org.apache.hadoop.fs.Path dst)
               throws java.io.IOException
```
    Overrides:
    
    rename in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - rename
```
public void rename(org.apache.hadoop.fs.Path src,
                   org.apache.hadoop.fs.Path dst,
                   org.apache.hadoop.fs.Options.Rename... options)
            throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    This rename operation is guaranteed to be atomic.
    
    Overrides:
    
    rename in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - truncate
```
public boolean truncate(org.apache.hadoop.fs.Path f,
                        long newLength)
                 throws java.io.IOException
```
    Overrides:
    
    truncate in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - delete
```
public boolean delete(org.apache.hadoop.fs.Path f,
                      boolean recursive)
               throws org.apache.hadoop.security.AccessControlException,
                      java.io.FileNotFoundException,
                      java.io.IOException
```
    Overrides:
    
    delete in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - getContentSummary
```
public org.apache.hadoop.fs.ContentSummary getContentSummary(org.apache.hadoop.fs.Path f)
                                                      throws java.io.IOException
```
    Overrides:
    
    getContentSummary in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getQuotaUsage
```
public org.apache.hadoop.fs.QuotaUsage getQuotaUsage(org.apache.hadoop.fs.Path f)
                                              throws java.io.IOException
```
    Overrides:
    
    getQuotaUsage in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - setQuota
```
public void setQuota(org.apache.hadoop.fs.Path src,
                     long namespaceQuota,
                     long storagespaceQuota)
              throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Set a directory's quotas
    
    Overrides:
    
    setQuota in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    ClientProtocol.setQuota(String, long, long, StorageType)
  - setQuotaByStorageType
```
public void setQuotaByStorageType(org.apache.hadoop.fs.Path src,
                                  org.apache.hadoop.fs.StorageType type,
                                  long quota)
                           throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Set the per type storage quota of a directory.
    
    Overrides:
    
    setQuotaByStorageType in class DistributedFileSystem
    
    Parameters:
    
    src - target directory whose quota is to be modified.
    
    type - storage type of the specific storage type quota to be modified.
    
    quota - value of the specific storage type quota to be modified. Maybe HdfsConstants.QUOTA_RESET to clear quota by storage type.
    
    Throws:
    
    java.io.IOException
  - listStatus
```
public org.apache.hadoop.fs.FileStatus[] listStatus(org.apache.hadoop.fs.Path p)
                                             throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    List all the entries of a directory Note that this operation is not atomic for a large directory. The entries of a directory may be fetched from NameNode multiple times. It only guarantees that each name occurs once if a directory undergoes changes between the calls. If any of the the immediate children of the given path f is a symlink, the returned FileStatus object of that children would be represented as a symlink. It will not be resolved to the target path and will not get the target path FileStatus object. The target path will be available via getSymlink on that children's FileStatus object. Since it represents as symlink, isDirectory on that children's FileStatus will return false. If you want to get the FileStatus of target path for that children, you may want to use GetFileStatus API with that children's symlink path. Please see DistributedFileSystem.getFileStatus(Path f)
    
    Overrides:
    
    listStatus in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - listLocatedStatus
```
public org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.LocatedFileStatus> listLocatedStatus(org.apache.hadoop.fs.Path f,
                                                                                                     org.apache.hadoop.fs.PathFilter filter)
                                                                                              throws java.io.FileNotFoundException,
                                                                                                     java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    The BlockLocation of returned LocatedFileStatus will have different formats for replicated and erasure coded file. Please refer to FileSystem.getFileBlockLocations(FileStatus, long, long) for more details.
    
    Overrides:
    
    listLocatedStatus in class DistributedFileSystem
    
    Throws:
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - listStatusIterator
```
public org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.FileStatus> listStatusIterator(org.apache.hadoop.fs.Path p)
                                                                                        throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns a remote iterator so that followup calls are made on demand while consuming the entries. This reduces memory consumption during listing of a large directory.
    
    Overrides:
    
    listStatusIterator in class DistributedFileSystem
    
    Parameters:
    
    p - target path
    
    Returns:
    
    remote iterator
    
    Throws:
    
    java.io.IOException
  - batchedListStatusIterator
```
public org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.PartialListing<org.apache.hadoop.fs.FileStatus>> batchedListStatusIterator(java.util.List<org.apache.hadoop.fs.Path> paths)
                                                                                                                                    throws java.io.IOException
```
    Specified by:
    
    batchedListStatusIterator in interface org.apache.hadoop.fs.BatchListingOperations
    
    Overrides:
    
    batchedListStatusIterator in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - batchedListLocatedStatusIterator
```
public org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.PartialListing<org.apache.hadoop.fs.LocatedFileStatus>> batchedListLocatedStatusIterator(java.util.List<org.apache.hadoop.fs.Path> paths)
                                                                                                                                                  throws java.io.IOException
```
    Specified by:
    
    batchedListLocatedStatusIterator in interface org.apache.hadoop.fs.BatchListingOperations
    
    Overrides:
    
    batchedListLocatedStatusIterator in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - mkdir
```
public boolean mkdir(org.apache.hadoop.fs.Path f,
                     org.apache.hadoop.fs.permission.FsPermission permission)
              throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Create a directory, only when the parent directories exist. See FsPermission.applyUMask(FsPermission) for details of how the permission is applied.
    
    Overrides:
    
    mkdir in class DistributedFileSystem
    
    Parameters:
    
    f - The path to create
    
    permission - The permission. See FsPermission#applyUMask for details about how this is used to calculate the effective permission.
    
    Throws:
    
    java.io.IOException
  - mkdirs
```
public boolean mkdirs(org.apache.hadoop.fs.Path f,
                      org.apache.hadoop.fs.permission.FsPermission permission)
               throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Create a directory and its parent directories. See FsPermission.applyUMask(FsPermission) for details of how the permission is applied.
    
    Overrides:
    
    mkdirs in class DistributedFileSystem
    
    Parameters:
    
    f - The path to create
    
    permission - The permission. See FsPermission#applyUMask for details about how this is used to calculate the effective permission.
    
    Throws:
    
    java.io.IOException
  - primitiveMkdir
```
protected boolean primitiveMkdir(org.apache.hadoop.fs.Path f,
                                 org.apache.hadoop.fs.permission.FsPermission absolutePermission)
                          throws java.io.IOException
```
    Overrides:
    
    primitiveMkdir in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - close
```
public void close()
           throws java.io.IOException
```
    Specified by:
    
    close in interface java.lang.AutoCloseable
    
    Specified by:
    
    close in interface java.io.Closeable
    
    Overrides:
    
    close in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getClient
```
@Private
public DFSClient getClient()
```
    Overrides:
    
    getClient in class DistributedFileSystem
  - getStatus
```
public org.apache.hadoop.fs.FsStatus getStatus(org.apache.hadoop.fs.Path p)
                                        throws java.io.IOException
```
    Overrides:
    
    getStatus in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getMissingBlocksCount
```
public long getMissingBlocksCount()
                           throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns count of blocks with no good replicas left. Normally should be zero.
    
    Overrides:
    
    getMissingBlocksCount in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getPendingDeletionBlocksCount
```
public long getPendingDeletionBlocksCount()
                                   throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns count of blocks pending on deletion.
    
    Overrides:
    
    getPendingDeletionBlocksCount in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getMissingReplOneBlocksCount
```
public long getMissingReplOneBlocksCount()
                                  throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns count of blocks with replication factor 1 and have lost the only replica.
    
    Overrides:
    
    getMissingReplOneBlocksCount in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getLowRedundancyBlocksCount
```
public long getLowRedundancyBlocksCount()
                                 throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns aggregated count of blocks with less redundancy.
    
    Overrides:
    
    getLowRedundancyBlocksCount in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getCorruptBlocksCount
```
public long getCorruptBlocksCount()
                           throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns count of blocks with at least one replica marked corrupt.
    
    Overrides:
    
    getCorruptBlocksCount in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - listCorruptFileBlocks
```
public org.apache.hadoop.fs.RemoteIterator<org.apache.hadoop.fs.Path> listCorruptFileBlocks(org.apache.hadoop.fs.Path path)
                                                                                     throws java.io.IOException
```
    Overrides:
    
    listCorruptFileBlocks in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getDataNodeStats
```
public DatanodeInfo[] getDataNodeStats()
                                throws java.io.IOException
```
    Overrides:
    
    getDataNodeStats in class DistributedFileSystem
    
    Returns:
    
    datanode statistics.
    
    Throws:
    
    java.io.IOException
  - getDataNodeStats
```
public DatanodeInfo[] getDataNodeStats(HdfsConstants.DatanodeReportType type)
                                throws java.io.IOException
```
    Overrides:
    
    getDataNodeStats in class DistributedFileSystem
    
    Returns:
    
    datanode statistics for the given type.
    
    Throws:
    
    java.io.IOException
  - setSafeMode
```
public boolean setSafeMode(HdfsConstants.SafeModeAction action)
                    throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Enter, leave or get safe mode.
    
    Overrides:
    
    setSafeMode in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    ClientProtocol.setSafeMode(HdfsConstants.SafeModeAction, boolean)
  - setSafeMode
```
public boolean setSafeMode(HdfsConstants.SafeModeAction action,
                           boolean isChecked)
                    throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Enter, leave or get safe mode.
    
    Overrides:
    
    setSafeMode in class DistributedFileSystem
    
    Parameters:
    
    action - One of SafeModeAction.ENTER, SafeModeAction.LEAVE and SafeModeAction.GET.
    
    isChecked - If true check only for Active NNs status, else check first NN's status.
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    ClientProtocol.setSafeMode(HdfsConstants.SafeModeAction, boolean)
  - saveNamespace
```
public boolean saveNamespace(long timeWindow,
                             long txGap)
                      throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Save namespace image.
    
    Overrides:
    
    saveNamespace in class DistributedFileSystem
    
    Parameters:
    
    timeWindow - NameNode can ignore this command if the latest checkpoint was done within the given time period (in seconds).
    
    Returns:
    
    true if a new checkpoint has been made
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    ClientProtocol.saveNamespace(long, long)
  - saveNamespace
```
public void saveNamespace()
                   throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Save namespace image. NameNode always does the checkpoint.
    
    Overrides:
    
    saveNamespace in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - rollEdits
```
public long rollEdits()
               throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Rolls the edit log on the active NameNode. Requires super-user privileges.
    
    Overrides:
    
    rollEdits in class DistributedFileSystem
    
    Returns:
    
    the transaction ID of the newly created segment
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    ClientProtocol.rollEdits()
  - restoreFailedStorage
```
public boolean restoreFailedStorage(java.lang.String arg)
                             throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    enable/disable/check restoreFaileStorage.
    
    Overrides:
    
    restoreFailedStorage in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    ClientProtocol.restoreFailedStorage(String arg)
  - refreshNodes
```
public void refreshNodes()
                  throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Refreshes the list of hosts and excluded hosts from the configured files.
    
    Overrides:
    
    refreshNodes in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - finalizeUpgrade
```
public void finalizeUpgrade()
                     throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Finalize previously upgraded files system state.
    
    Overrides:
    
    finalizeUpgrade in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - upgradeStatus
```
public boolean upgradeStatus()
                      throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Get status of upgrade - finalized or not.
    
    Overrides:
    
    upgradeStatus in class DistributedFileSystem
    
    Returns:
    
    true if upgrade is finalized or if no upgrade is in progress and false otherwise.
    
    Throws:
    
    java.io.IOException
  - rollingUpgrade
```
public RollingUpgradeInfo rollingUpgrade(HdfsConstants.RollingUpgradeAction action)
                                  throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Rolling upgrade: prepare/finalize/query.
    
    Overrides:
    
    rollingUpgrade in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - metaSave
```
public void metaSave(java.lang.String pathname)
              throws java.io.IOException
```
    Overrides:
    
    metaSave in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getServerDefaults
```
public org.apache.hadoop.fs.FsServerDefaults getServerDefaults()
                                                        throws java.io.IOException
```
    Overrides:
    
    getServerDefaults in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getFileStatus
```
public org.apache.hadoop.fs.FileStatus getFileStatus(org.apache.hadoop.fs.Path f)
                                              throws org.apache.hadoop.security.AccessControlException,
                                                     java.io.FileNotFoundException,
                                                     java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns the stat information about the file. If the given path is a symlink, the path will be resolved to a target path and it will get the resolved path's FileStatus object. It will not be represented as a symlink and isDirectory API returns true if the resolved path is a directory, false otherwise.
    
    Overrides:
    
    getFileStatus in class DistributedFileSystem
    
    Throws:
    
    java.io.FileNotFoundException - if the file does not exist.
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.IOException
  - createSymlink
```
public void createSymlink(org.apache.hadoop.fs.Path target,
                          org.apache.hadoop.fs.Path link,
                          boolean createParent)
                   throws java.io.IOException
```
    Overrides:
    
    createSymlink in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - supportsSymlinks
```
public boolean supportsSymlinks()
```
    Overrides:
    
    supportsSymlinks in class DistributedFileSystem
  - getFileLinkStatus
```
public org.apache.hadoop.fs.FileStatus getFileLinkStatus(org.apache.hadoop.fs.Path f)
                                                  throws java.io.IOException
```
    Overrides:
    
    getFileLinkStatus in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getLinkTarget
```
public org.apache.hadoop.fs.Path getLinkTarget(org.apache.hadoop.fs.Path path)
                                        throws java.io.IOException
```
    Overrides:
    
    getLinkTarget in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - resolveLink
```
protected org.apache.hadoop.fs.Path resolveLink(org.apache.hadoop.fs.Path f)
                                         throws java.io.IOException
```
    Overrides:
    
    resolveLink in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getFileChecksum
```
public org.apache.hadoop.fs.FileChecksum getFileChecksum(org.apache.hadoop.fs.Path f)
                                                  throws org.apache.hadoop.security.AccessControlException,
                                                         java.io.FileNotFoundException,
                                                         java.io.IOException
```
    Overrides:
    
    getFileChecksum in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - setPermission
```
public void setPermission(org.apache.hadoop.fs.Path f,
                          org.apache.hadoop.fs.permission.FsPermission permission)
                   throws org.apache.hadoop.security.AccessControlException,
                          java.io.FileNotFoundException,
                          java.io.IOException
```
    Overrides:
    
    setPermission in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - setOwner
```
public void setOwner(org.apache.hadoop.fs.Path f,
                     java.lang.String username,
                     java.lang.String groupname)
              throws org.apache.hadoop.security.AccessControlException,
                     java.io.FileNotFoundException,
                     java.io.IOException
```
    Overrides:
    
    setOwner in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - setTimes
```
public void setTimes(org.apache.hadoop.fs.Path f,
                     long mtime,
                     long atime)
              throws org.apache.hadoop.security.AccessControlException,
                     java.io.FileNotFoundException,
                     java.io.IOException
```
    Overrides:
    
    setTimes in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - getDefaultPort
```
protected int getDefaultPort()
```
    Overrides:
    
    getDefaultPort in class DistributedFileSystem
  - getDelegationToken
```
public org.apache.hadoop.security.token.Token<DelegationTokenIdentifier> getDelegationToken(java.lang.String renewer)
                                                                                     throws java.io.IOException
```
    If no mount points configured, it works same as DistributedFileSystem.getDelegationToken(String). If there are mount points configured and if default fs(linkFallback) configured, then it will return default fs delegation token. Otherwise it will return null.
    
    Specified by:
    
    getDelegationToken in interface org.apache.hadoop.security.token.DelegationTokenIssuer
    
    Overrides:
    
    getDelegationToken in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - setBalancerBandwidth
```
public void setBalancerBandwidth(long bandwidth)
                          throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Requests the namenode to tell all datanodes to use a new, non-persistent bandwidth value for dfs.datanode.balance.bandwidthPerSec. The bandwidth parameter is the max number of bytes per second of network bandwidth to be used by a datanode during balancing.
    
    Overrides:
    
    setBalancerBandwidth in class DistributedFileSystem
    
    Parameters:
    
    bandwidth - Balancer bandwidth in bytes per second for all datanodes.
    
    Throws:
    
    java.io.IOException
  - getCanonicalServiceName
```
public java.lang.String getCanonicalServiceName()
```
    Description copied from class: DistributedFileSystem
    
    Get a canonical service name for this file system. If the URI is logical, the hostname part of the URI will be returned.
    
    Specified by:
    
    getCanonicalServiceName in interface org.apache.hadoop.security.token.DelegationTokenIssuer
    
    Overrides:
    
    getCanonicalServiceName in class DistributedFileSystem
    
    Returns:
    
    a service string that uniquely identifies this file system.
  - canonicalizeUri
```
protected java.net.URI canonicalizeUri(java.net.URI uri)
```
    Overrides:
    
    canonicalizeUri in class DistributedFileSystem
  - isInSafeMode
```
public boolean isInSafeMode()
                     throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Utility function that returns if the NameNode is in safemode or not. In HA mode, this API will return only ActiveNN's safemode status.
    
    Overrides:
    
    isInSafeMode in class DistributedFileSystem
    
    Returns:
    
    true if NameNode is in safemode, false otherwise.
    
    Throws:
    
    java.io.IOException - when there is an issue communicating with the NameNode
  - allowSnapshot
```
public void allowSnapshot(org.apache.hadoop.fs.Path path)
                   throws java.io.IOException
```
    Overrides:
    
    allowSnapshot in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    HdfsAdmin.allowSnapshot(Path)
  - disallowSnapshot
```
public void disallowSnapshot(org.apache.hadoop.fs.Path path)
                      throws java.io.IOException
```
    Overrides:
    
    disallowSnapshot in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    HdfsAdmin.disallowSnapshot(Path)
  - createSnapshot
```
public org.apache.hadoop.fs.Path createSnapshot(org.apache.hadoop.fs.Path path,
                                                java.lang.String snapshotName)
                                         throws java.io.IOException
```
    Overrides:
    
    createSnapshot in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - renameSnapshot
```
public void renameSnapshot(org.apache.hadoop.fs.Path path,
                           java.lang.String snapshotOldName,
                           java.lang.String snapshotNewName)
                    throws java.io.IOException
```
    Overrides:
    
    renameSnapshot in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getSnapshottableDirListing
```
public SnapshottableDirectoryStatus[] getSnapshottableDirListing()
                                                          throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Get the list of snapshottable directories that are owned by the current user. Return all the snapshottable directories if the current user is a super user.
    
    Overrides:
    
    getSnapshottableDirListing in class DistributedFileSystem
    
    Returns:
    
    The list of all the current snapshottable directories.
    
    Throws:
    
    java.io.IOException - If an I/O error occurred.
  - deleteSnapshot
```
public void deleteSnapshot(org.apache.hadoop.fs.Path path,
                           java.lang.String snapshotName)
                    throws java.io.IOException
```
    Overrides:
    
    deleteSnapshot in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - snapshotDiffReportListingRemoteIterator
```
public org.apache.hadoop.fs.RemoteIterator<SnapshotDiffReportListing> snapshotDiffReportListingRemoteIterator(org.apache.hadoop.fs.Path snapshotDir,
                                                                                                              java.lang.String fromSnapshot,
                                                                                                              java.lang.String toSnapshot)
                                                                                                       throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Returns a remote iterator so that followup calls are made on demand while consuming the SnapshotDiffReportListing entries. This reduces memory consumption overhead in case the snapshotDiffReport is huge.
    
    Overrides:
    
    snapshotDiffReportListingRemoteIterator in class DistributedFileSystem
    
    Parameters:
    
    snapshotDir - full path of the directory where snapshots are taken
    
    fromSnapshot - snapshot name of the from point. Null indicates the current tree
    
    toSnapshot - snapshot name of the to point. Null indicates the current tree.
    
    Returns:
    
    Remote iterator
    
    Throws:
    
    java.io.IOException
  - getSnapshotDiffReport
```
public SnapshotDiffReport getSnapshotDiffReport(org.apache.hadoop.fs.Path snapshotDir,
                                                java.lang.String fromSnapshot,
                                                java.lang.String toSnapshot)
                                         throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Get the difference between two snapshots, or between a snapshot and the current tree of a directory.
    
    Overrides:
    
    getSnapshotDiffReport in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    DFSClient.getSnapshotDiffReportListing(java.lang.String, java.lang.String, java.lang.String, byte[], int)
  - isFileClosed
```
public boolean isFileClosed(org.apache.hadoop.fs.Path src)
                     throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Get the close status of a file
    
    Specified by:
    
    isFileClosed in interface org.apache.hadoop.fs.LeaseRecoverable
    
    Overrides:
    
    isFileClosed in class DistributedFileSystem
    
    Parameters:
    
    src - The path to the file
    
    Returns:
    
    return true if file is closed
    
    Throws:
    
    java.io.FileNotFoundException - if the file does not exist.
    
    java.io.IOException - If an I/O error occurred
  - addCacheDirective
```
public long addCacheDirective(CacheDirectiveInfo info)
                       throws java.io.IOException
```
    Overrides:
    
    addCacheDirective in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    DistributedFileSystem.addCacheDirective(CacheDirectiveInfo, EnumSet)
  - addCacheDirective
```
public long addCacheDirective(CacheDirectiveInfo info,
                              java.util.EnumSet<CacheFlag> flags)
                       throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Add a new CacheDirective.
    
    Overrides:
    
    addCacheDirective in class DistributedFileSystem
    
    Parameters:
    
    info - Information about a directive to add.
    
    flags - CacheFlags to use for this operation.
    
    Returns:
    
    the ID of the directive that was created.
    
    Throws:
    
    java.io.IOException - if the directive could not be added
  - modifyCacheDirective
```
public void modifyCacheDirective(CacheDirectiveInfo info)
                          throws java.io.IOException
```
    Overrides:
    
    modifyCacheDirective in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
    
    See Also:
    
    DistributedFileSystem.modifyCacheDirective(CacheDirectiveInfo, EnumSet)
  - modifyCacheDirective
```
public void modifyCacheDirective(CacheDirectiveInfo info,
                                 java.util.EnumSet<CacheFlag> flags)
                          throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Modify a CacheDirective.
    
    Overrides:
    
    modifyCacheDirective in class DistributedFileSystem
    
    Parameters:
    
    info - Information about the directive to modify. You must set the ID to indicate which CacheDirective you want to modify.
    
    flags - CacheFlags to use for this operation.
    
    Throws:
    
    java.io.IOException - if the directive could not be modified
  - removeCacheDirective
```
public void removeCacheDirective(long id)
                          throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Remove a CacheDirectiveInfo.
    
    Overrides:
    
    removeCacheDirective in class DistributedFileSystem
    
    Parameters:
    
    id - identifier of the CacheDirectiveInfo to remove
    
    Throws:
    
    java.io.IOException - if the directive could not be removed
  - listCacheDirectives
```
public org.apache.hadoop.fs.RemoteIterator<CacheDirectiveEntry> listCacheDirectives(CacheDirectiveInfo filter)
                                                                             throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    List cache directives. Incrementally fetches results from the server.
    
    Overrides:
    
    listCacheDirectives in class DistributedFileSystem
    
    Parameters:
    
    filter - Filter parameters to use when listing the directives, null to list all directives visible to us.
    
    Returns:
    
    A RemoteIterator which returns CacheDirectiveInfo objects.
    
    Throws:
    
    java.io.IOException
  - addCachePool
```
public void addCachePool(CachePoolInfo info)
                  throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Add a cache pool.
    
    Overrides:
    
    addCachePool in class DistributedFileSystem
    
    Parameters:
    
    info - The request to add a cache pool.
    
    Throws:
    
    java.io.IOException - If the request could not be completed.
  - modifyCachePool
```
public void modifyCachePool(CachePoolInfo info)
                     throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Modify an existing cache pool.
    
    Overrides:
    
    modifyCachePool in class DistributedFileSystem
    
    Parameters:
    
    info - The request to modify a cache pool.
    
    Throws:
    
    java.io.IOException - If the request could not be completed.
  - removeCachePool
```
public void removeCachePool(java.lang.String poolName)
                     throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Remove a cache pool.
    
    Overrides:
    
    removeCachePool in class DistributedFileSystem
    
    Parameters:
    
    poolName - Name of the cache pool to remove.
    
    Throws:
    
    java.io.IOException - if the cache pool did not exist, or could not be removed.
  - listCachePools
```
public org.apache.hadoop.fs.RemoteIterator<CachePoolEntry> listCachePools()
                                                                   throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    List all cache pools.
    
    Overrides:
    
    listCachePools in class DistributedFileSystem
    
    Returns:
    
    A remote iterator from which you can get CachePoolEntry objects. Requests will be made as needed.
    
    Throws:
    
    java.io.IOException - If there was an error listing cache pools.
  - modifyAclEntries
```
public void modifyAclEntries(org.apache.hadoop.fs.Path path,
                             java.util.List<org.apache.hadoop.fs.permission.AclEntry> aclSpec)
                      throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Overrides:
    
    modifyAclEntries in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - removeAclEntries
```
public void removeAclEntries(org.apache.hadoop.fs.Path path,
                             java.util.List<org.apache.hadoop.fs.permission.AclEntry> aclSpec)
                      throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Overrides:
    
    removeAclEntries in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - removeDefaultAcl
```
public void removeDefaultAcl(org.apache.hadoop.fs.Path path)
                      throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Overrides:
    
    removeDefaultAcl in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - removeAcl
```
public void removeAcl(org.apache.hadoop.fs.Path path)
               throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Overrides:
    
    removeAcl in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - setAcl
```
public void setAcl(org.apache.hadoop.fs.Path path,
                   java.util.List<org.apache.hadoop.fs.permission.AclEntry> aclSpec)
            throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Overrides:
    
    setAcl in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getAclStatus
```
public org.apache.hadoop.fs.permission.AclStatus getAclStatus(org.apache.hadoop.fs.Path path)
                                                       throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Overrides:
    
    getAclStatus in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - createEncryptionZone
```
public void createEncryptionZone(org.apache.hadoop.fs.Path path,
                                 java.lang.String keyName)
                          throws java.io.IOException
```
    Overrides:
    
    createEncryptionZone in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getEZForPath
```
public EncryptionZone getEZForPath(org.apache.hadoop.fs.Path path)
                            throws java.io.IOException
```
    Overrides:
    
    getEZForPath in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - listEncryptionZones
```
public org.apache.hadoop.fs.RemoteIterator<EncryptionZone> listEncryptionZones()
                                                                        throws java.io.IOException
```
    Returns the results from default DFS (fallback). If you want the results from specific clusters, please invoke them on child fs instance directly.
    
    Overrides:
    
    listEncryptionZones in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - reencryptEncryptionZone
```
public void reencryptEncryptionZone(org.apache.hadoop.fs.Path zone,
                                    HdfsConstants.ReencryptAction action)
                             throws java.io.IOException
```
    Overrides:
    
    reencryptEncryptionZone in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - listReencryptionStatus
```
public org.apache.hadoop.fs.RemoteIterator<ZoneReencryptionStatus> listReencryptionStatus()
                                                                                   throws java.io.IOException
```
    Returns the results from default DFS (fallback). If you want the results from specific clusters, please invoke them on child fs instance directly.
    
    Overrides:
    
    listReencryptionStatus in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getFileEncryptionInfo
```
public org.apache.hadoop.fs.FileEncryptionInfo getFileEncryptionInfo(org.apache.hadoop.fs.Path path)
                                                              throws java.io.IOException
```
    Overrides:
    
    getFileEncryptionInfo in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - provisionEZTrash
```
public void provisionEZTrash(org.apache.hadoop.fs.Path path,
                             org.apache.hadoop.fs.permission.FsPermission trashPermission)
                      throws java.io.IOException
```
    Overrides:
    
    provisionEZTrash in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - provisionSnapshotTrash
```
public org.apache.hadoop.fs.Path provisionSnapshotTrash(org.apache.hadoop.fs.Path path,
                                                        org.apache.hadoop.fs.permission.FsPermission trashPermission)
                                                 throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    HDFS only. Provision snapshottable directory trash.
    
    Overrides:
    
    provisionSnapshotTrash in class DistributedFileSystem
    
    Parameters:
    
    path - Path to a snapshottable directory.
    
    trashPermission - Expected FsPermission of the trash root.
    
    Returns:
    
    Path of the provisioned trash root
    
    Throws:
    
    java.io.IOException
  - setXAttr
```
public void setXAttr(org.apache.hadoop.fs.Path path,
                     java.lang.String name,
                     byte[] value,
                     java.util.EnumSet<org.apache.hadoop.fs.XAttrSetFlag> flag)
              throws java.io.IOException
```
    Overrides:
    
    setXAttr in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getXAttr
```
public byte[] getXAttr(org.apache.hadoop.fs.Path path,
                       java.lang.String name)
                throws java.io.IOException
```
    Overrides:
    
    getXAttr in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getXAttrs
```
public java.util.Map<java.lang.String,byte[]> getXAttrs(org.apache.hadoop.fs.Path path)
                                                       throws java.io.IOException
```
    Overrides:
    
    getXAttrs in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getXAttrs
```
public java.util.Map<java.lang.String,byte[]> getXAttrs(org.apache.hadoop.fs.Path path,
                                                              java.util.List<java.lang.String> names)
                                                       throws java.io.IOException
```
    Overrides:
    
    getXAttrs in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - listXAttrs
```
public java.util.List<java.lang.String> listXAttrs(org.apache.hadoop.fs.Path path)
                                            throws java.io.IOException
```
    Overrides:
    
    listXAttrs in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - removeXAttr
```
public void removeXAttr(org.apache.hadoop.fs.Path path,
                        java.lang.String name)
                 throws java.io.IOException
```
    Overrides:
    
    removeXAttr in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - access
```
public void access(org.apache.hadoop.fs.Path path,
                   org.apache.hadoop.fs.permission.FsAction mode)
            throws org.apache.hadoop.security.AccessControlException,
                   java.io.FileNotFoundException,
                   java.io.IOException
```
    Overrides:
    
    access in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - getKeyProviderUri
```
public java.net.URI getKeyProviderUri()
                               throws java.io.IOException
```
    Specified by:
    
    getKeyProviderUri in interface org.apache.hadoop.crypto.key.KeyProviderTokenIssuer
    
    Overrides:
    
    getKeyProviderUri in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getKeyProvider
```
public org.apache.hadoop.crypto.key.KeyProvider getKeyProvider()
                                                        throws java.io.IOException
```
    Specified by:
    
    getKeyProvider in interface org.apache.hadoop.crypto.key.KeyProviderTokenIssuer
    
    Overrides:
    
    getKeyProvider in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getAdditionalTokenIssuers
```
public org.apache.hadoop.security.token.DelegationTokenIssuer[] getAdditionalTokenIssuers()
                                                                                   throws java.io.IOException
```
    Specified by:
    
    getAdditionalTokenIssuers in interface org.apache.hadoop.security.token.DelegationTokenIssuer
    
    Overrides:
    
    getAdditionalTokenIssuers in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getInotifyEventStream
```
public DFSInotifyEventInputStream getInotifyEventStream()
                                                 throws java.io.IOException
```
    Overrides:
    
    getInotifyEventStream in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - getInotifyEventStream
```
public DFSInotifyEventInputStream getInotifyEventStream(long lastReadTxid)
                                                 throws java.io.IOException
```
    Overrides:
    
    getInotifyEventStream in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - setErasureCodingPolicy
```
public void setErasureCodingPolicy(org.apache.hadoop.fs.Path path,
                                   java.lang.String ecPolicyName)
                            throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Set the source path to the specified erasure coding policy.
    
    Overrides:
    
    setErasureCodingPolicy in class DistributedFileSystem
    
    Parameters:
    
    path - The directory to set the policy
    
    ecPolicyName - The erasure coding policy name.
    
    Throws:
    
    java.io.IOException
  - satisfyStoragePolicy
```
public void satisfyStoragePolicy(org.apache.hadoop.fs.Path src)
                          throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Set the source path to satisfy storage policy.
    
    Overrides:
    
    satisfyStoragePolicy in class DistributedFileSystem
    
    Parameters:
    
    src - The source path referring to either a directory or a file.
    
    Throws:
    
    java.io.IOException
  - getErasureCodingPolicy
```
public ErasureCodingPolicy getErasureCodingPolicy(org.apache.hadoop.fs.Path path)
                                           throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Get erasure coding policy information for the specified path.
    
    Overrides:
    
    getErasureCodingPolicy in class DistributedFileSystem
    
    Parameters:
    
    path - The path of the file or directory
    
    Returns:
    
    Returns the policy information if file or directory on the path is erasure coded, null otherwise. Null will be returned if directory or file has REPLICATION policy.
    
    Throws:
    
    java.io.IOException
  - getAllErasureCodingPolicies
```
public java.util.Collection<ErasureCodingPolicyInfo> getAllErasureCodingPolicies()
                                                                          throws java.io.IOException
```
    Gets all erasure coding policies from all available child file systems.
    
    Overrides:
    
    getAllErasureCodingPolicies in class DistributedFileSystem
    
    Returns:
    
    all erasure coding policies supported by this file system.
    
    Throws:
    
    java.io.IOException
  - getAllErasureCodingCodecs
```
public java.util.Map<java.lang.String,java.lang.String> getAllErasureCodingCodecs()
                                                                                 throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Retrieve all the erasure coding codecs and coders supported by this file system.
    
    Overrides:
    
    getAllErasureCodingCodecs in class DistributedFileSystem
    
    Returns:
    
    all erasure coding codecs and coders supported by this file system.
    
    Throws:
    
    java.io.IOException
  - addErasureCodingPolicies
```
public AddErasureCodingPolicyResponse[] addErasureCodingPolicies(ErasureCodingPolicy[] policies)
                                                          throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Add Erasure coding policies to HDFS. For each policy input, schema and cellSize are musts, name and id are ignored. They will be automatically created and assigned by Namenode once the policy is successfully added, and will be returned in the response; policy states will be set to DISABLED automatically.
    
    Overrides:
    
    addErasureCodingPolicies in class DistributedFileSystem
    
    Parameters:
    
    policies - The user defined ec policy list to add.
    
    Returns:
    
    Return the response list of adding operations.
    
    Throws:
    
    java.io.IOException
  - removeErasureCodingPolicy
```
public void removeErasureCodingPolicy(java.lang.String ecPolicyName)
                               throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Remove erasure coding policy.
    
    Overrides:
    
    removeErasureCodingPolicy in class DistributedFileSystem
    
    Parameters:
    
    ecPolicyName - The name of the policy to be removed.
    
    Throws:
    
    java.io.IOException
  - enableErasureCodingPolicy
```
public void enableErasureCodingPolicy(java.lang.String ecPolicyName)
                               throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Enable erasure coding policy.
    
    Overrides:
    
    enableErasureCodingPolicy in class DistributedFileSystem
    
    Parameters:
    
    ecPolicyName - The name of the policy to be enabled.
    
    Throws:
    
    java.io.IOException
  - disableErasureCodingPolicy
```
public void disableErasureCodingPolicy(java.lang.String ecPolicyName)
                                throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Disable erasure coding policy.
    
    Overrides:
    
    disableErasureCodingPolicy in class DistributedFileSystem
    
    Parameters:
    
    ecPolicyName - The name of the policy to be disabled.
    
    Throws:
    
    java.io.IOException
  - unsetErasureCodingPolicy
```
public void unsetErasureCodingPolicy(org.apache.hadoop.fs.Path path)
                              throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Unset the erasure coding policy from the source path.
    
    Overrides:
    
    unsetErasureCodingPolicy in class DistributedFileSystem
    
    Parameters:
    
    path - The directory to unset the policy
    
    Throws:
    
    java.io.IOException
  - getECTopologyResultForPolicies
```
public ECTopologyVerifierResult getECTopologyResultForPolicies(java.lang.String... policyNames)
                                                        throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Verifies if the given policies are supported in the given cluster setup. If not policy is specified checks for all enabled policies.
    
    Overrides:
    
    getECTopologyResultForPolicies in class DistributedFileSystem
    
    Parameters:
    
    policyNames - name of policies.
    
    Returns:
    
    the result if the given policies are supported in the cluster setup
    
    Throws:
    
    java.io.IOException
  - getTrashRoot
```
public org.apache.hadoop.fs.Path getTrashRoot(org.apache.hadoop.fs.Path path)
```
    Description copied from class: DistributedFileSystem
    
    Get the root directory of Trash for a path in HDFS. 1. File in encryption zone returns /ez1/.Trash/username 2. File in snapshottable directory returns /snapdir1/.Trash/username if dfs.namenode.snapshot.trashroot.enabled is set to true. 3. In other cases, or encountered exception when checking the encryption zone or when checking snapshot root of the path, returns /users/username/.Trash Caller appends either Current or checkpoint timestamp for trash destination
    
    Overrides:
    
    getTrashRoot in class DistributedFileSystem
    
    Parameters:
    
    path - the trash root of the path to be determined.
    
    Returns:
    
    trash root
  - getTrashRoots
```
public java.util.Collection<org.apache.hadoop.fs.FileStatus> getTrashRoots(boolean allUsers)
```
    Description copied from class: DistributedFileSystem
    
    Get all the trash roots of HDFS for current user or for all the users. 1. File deleted from encryption zones e.g., ez1 rooted at /ez1 has its trash root at /ez1/.Trash/$USER 2. File deleted from snapshottable directories if dfs.namenode.snapshot.trashroot.enabled is set to true. e.g., snapshottable directory /snapdir1 has its trash root at /snapdir1/.Trash/$USER 3. File deleted from other directories /user/username/.Trash
    
    Overrides:
    
    getTrashRoots in class DistributedFileSystem
    
    Parameters:
    
    allUsers - return trashRoots of all users if true, used by emptier
    
    Returns:
    
    trash roots of HDFS
  - fixRelativePart
```
protected org.apache.hadoop.fs.Path fixRelativePart(org.apache.hadoop.fs.Path p)
```
    Overrides:
    
    fixRelativePart in class DistributedFileSystem
  - createFile
```
public DistributedFileSystem.HdfsDataOutputStreamBuilder createFile(org.apache.hadoop.fs.Path path)
```
    Description copied from class: DistributedFileSystem
    
    Create a HdfsDataOutputStreamBuilder to create a file on DFS. Similar to FileSystem.create(Path), file is overwritten by default.
    
    Overrides:
    
    createFile in class DistributedFileSystem
    
    Parameters:
    
    path - the path of the file to create.
    
    Returns:
    
    A HdfsDataOutputStreamBuilder for creating a file.
  - listOpenFiles
```
@Deprecated
public org.apache.hadoop.fs.RemoteIterator<OpenFileEntry> listOpenFiles()
                                                                 throws java.io.IOException
```
    Deprecated.
    
    Description copied from class: DistributedFileSystem
    
    Returns a RemoteIterator which can be used to list all open files currently managed by the NameNode. For large numbers of open files, iterator will fetch the list in batches of configured size.
    Since the list is fetched in batches, it does not represent a consistent snapshot of the all open files.
    This method can only be called by HDFS superusers.
    
    Overrides:
    
    listOpenFiles in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - listOpenFiles
```
@Deprecated
public org.apache.hadoop.fs.RemoteIterator<OpenFileEntry> listOpenFiles(java.util.EnumSet<OpenFilesIterator.OpenFilesType> openFilesTypes)
                                                                 throws java.io.IOException
```
    Deprecated.
    
    Overrides:
    
    listOpenFiles in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - listOpenFiles
```
public org.apache.hadoop.fs.RemoteIterator<OpenFileEntry> listOpenFiles(java.util.EnumSet<OpenFilesIterator.OpenFilesType> openFilesTypes,
                                                                        java.lang.String path)
                                                                 throws java.io.IOException
```
    Overrides:
    
    listOpenFiles in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - appendFile
```
public DistributedFileSystem.HdfsDataOutputStreamBuilder appendFile(org.apache.hadoop.fs.Path path)
```
    Description copied from class: DistributedFileSystem
    
    Create a DistributedFileSystem.HdfsDataOutputStreamBuilder to append a file on DFS.
    
    Overrides:
    
    appendFile in class DistributedFileSystem
    
    Parameters:
    
    path - file path.
    
    Returns:
    
    A DistributedFileSystem.HdfsDataOutputStreamBuilder for appending a file.
  - hasPathCapability
```
public boolean hasPathCapability(org.apache.hadoop.fs.Path path,
                                 java.lang.String capability)
                          throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    HDFS client capabilities. Uses DfsPathCapabilities to keep WebHdfsFileSystem in sync.
    
    Specified by:
    
    hasPathCapability in interface org.apache.hadoop.fs.PathCapabilities
    
    Overrides:
    
    hasPathCapability in class DistributedFileSystem
    
    Throws:
    
    java.io.IOException
  - resolvePath
```
public org.apache.hadoop.fs.Path resolvePath(org.apache.hadoop.fs.Path f)
                                      throws java.io.IOException
```
    Overrides:
    
    resolvePath in class org.apache.hadoop.fs.FileSystem
    
    Throws:
    
    java.io.IOException
  - delete
```
public boolean delete(org.apache.hadoop.fs.Path f)
               throws org.apache.hadoop.security.AccessControlException,
                      java.io.FileNotFoundException,
                      java.io.IOException
```
    Overrides:
    
    delete in class org.apache.hadoop.fs.FileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - getFileChecksum
```
public org.apache.hadoop.fs.FileChecksum getFileChecksum(org.apache.hadoop.fs.Path f,
                                                         long length)
                                                  throws org.apache.hadoop.security.AccessControlException,
                                                         java.io.FileNotFoundException,
                                                         java.io.IOException
```
    Overrides:
    
    getFileChecksum in class DistributedFileSystem
    
    Throws:
    
    org.apache.hadoop.security.AccessControlException
    
    java.io.FileNotFoundException
    
    java.io.IOException
  - mkdirs
```
public boolean mkdirs(org.apache.hadoop.fs.Path dir)
               throws java.io.IOException
```
    Overrides:
    
    mkdirs in class org.apache.hadoop.fs.FileSystem
    
    Throws:
    
    java.io.IOException
  - getDefaultBlockSize
```
public long getDefaultBlockSize(org.apache.hadoop.fs.Path f)
```
    Overrides:
    
    getDefaultBlockSize in class org.apache.hadoop.fs.FileSystem
  - getDefaultReplication
```
public short getDefaultReplication(org.apache.hadoop.fs.Path f)
```
    Overrides:
    
    getDefaultReplication in class org.apache.hadoop.fs.FileSystem
  - getServerDefaults
```
public org.apache.hadoop.fs.FsServerDefaults getServerDefaults(org.apache.hadoop.fs.Path f)
                                                        throws java.io.IOException
```
    Overrides:
    
    getServerDefaults in class org.apache.hadoop.fs.FileSystem
    
    Throws:
    
    java.io.IOException
  - setWriteChecksum
```
public void setWriteChecksum(boolean writeChecksum)
```
    Overrides:
    
    setWriteChecksum in class org.apache.hadoop.fs.FileSystem
  - getChildFileSystems
```
public org.apache.hadoop.fs.FileSystem[] getChildFileSystems()
```
    Overrides:
    
    getChildFileSystems in class org.apache.hadoop.fs.FileSystem
  - getMountPoints
```
public org.apache.hadoop.fs.viewfs.ViewFileSystem.MountPoint[] getMountPoints()
```
  - getStatus
```
public org.apache.hadoop.fs.FsStatus getStatus()
                                        throws java.io.IOException
```
    Overrides:
    
    getStatus in class org.apache.hadoop.fs.FileSystem
    
    Throws:
    
    java.io.IOException
  - getUsed
```
public long getUsed()
             throws java.io.IOException
```
    Overrides:
    
    getUsed in class org.apache.hadoop.fs.FileSystem
    
    Throws:
    
    java.io.IOException
  - getSlowDatanodeStats
```
public DatanodeInfo[] getSlowDatanodeStats()
                                    throws java.io.IOException
```
    Description copied from class: DistributedFileSystem
    
    Retrieve stats for slow running datanodes.
    
    Overrides:
    
    getSlowDatanodeStats in class DistributedFileSystem
    
    Returns:
    
    An array of slow datanode info.
    
    Throws:
    
    java.io.IOException - If an I/O error occurs.

Class ViewDistributedFileSystem

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hdfs.DistributedFileSystem

Nested classes/interfaces inherited from class org.apache.hadoop.fs.FileSystem

Field Summary

Fields inherited from class org.apache.hadoop.fs.FileSystem

Fields inherited from interface org.apache.hadoop.security.token.DelegationTokenIssuer

Constructor Summary

Method Summary

Methods inherited from class org.apache.hadoop.hdfs.DistributedFileSystem

Methods inherited from class org.apache.hadoop.fs.FileSystem

Methods inherited from class org.apache.hadoop.conf.Configured

Methods inherited from class java.lang.Object

Methods inherited from interface org.apache.hadoop.security.token.DelegationTokenIssuer

Constructor Detail

ViewDistributedFileSystem

Method Detail

initialize

getUri

getScheme

getWorkingDirectory

setWorkingDirectory

getHomeDirectory

getHedgedReadMetrics

getFileBlockLocations

getFileBlockLocations

setVerifyChecksum

recoverLease

open

open

createPathHandle

append

append

append

create

create

create

primitiveCreate

createNonRecursive

setReplication

setStoragePolicy

unsetStoragePolicy

getStoragePolicy

getAllStoragePolicies

getBytesWithFutureGenerationStamps

getStoragePolicies

concat

rename

rename

truncate

delete

getContentSummary

getQuotaUsage

setQuota

setQuotaByStorageType

listStatus

listLocatedStatus

listStatusIterator

batchedListStatusIterator

batchedListLocatedStatusIterator

mkdir

mkdirs

primitiveMkdir

close

getClient

getStatus

getMissingBlocksCount

getPendingDeletionBlocksCount

getMissingReplOneBlocksCount

getLowRedundancyBlocksCount

getCorruptBlocksCount

listCorruptFileBlocks

getDataNodeStats

getDataNodeStats

setSafeMode

setSafeMode

saveNamespace

saveNamespace

rollEdits

restoreFailedStorage