FSNamesystem (Apache Hadoop HDFS 3.4.1.0-eep-940 API)

java.lang.Object
- org.apache.hadoop.hdfs.server.namenode.FSNamesystem

All Implemented Interfaces:

ECBlockGroupsMBean, FSNamesystemMBean, ReplicatedBlocksMBean, NameNodeMXBean, Namesystem, SafeMode, RwLock
```
@Private
@Metrics(context="dfs")
public class FSNamesystem
extends java.lang.Object
implements Namesystem, FSNamesystemMBean, NameNodeMXBean, ReplicatedBlocksMBean, ECBlockGroupsMBean
```
FSNamesystem is a container of both transient and persisted name-space state, and does all the book-keeping work on a NameNode. Its roles are briefly described below: 1) Is the container for BlockManager, DatanodeManager, DelegationTokens, LeaseManager, etc. services. 2) RPC calls that modify or inspect the name-space should get delegated here. 3) Anything that touches only blocks (eg. block reports), it delegates to BlockManager. 4) Anything that touches only file information (eg. permissions, mkdirs), it delegates to FSDirectory. 5) Anything that crosses two of the above components should be coordinated here. 6) Logs mutations to FSEditLog. This class and its contents keep: 1) Valid fsname --> blocklist (kept on disk, logged) 2) Set of all valid blocks (inverted #1) 3) block --> machinelist (kept in memory, rebuilt dynamically from reports) 4) machine --> blocklist (inverted #2) 5) LRU cache of updated-heartbeat machines

Field Summary

Fields
Modifier and Type	Field	Description
`static org.slf4j.Logger`	`AUDIT_LOG`	Logger for audit events, noting successful FSNamesystem operations.
`static java.lang.String`	`DFS_NAMENODE_SNAPSHOT_TRASHROOT_ENABLED`
`static boolean`	`DFS_NAMENODE_SNAPSHOT_TRASHROOT_ENABLED_DEFAULT`
`static org.slf4j.Logger`	`LOG`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`checkAndProvisionSnapshotTrashRoots()`	Check if snapshot roots are created for all existing snapshottable directories.
`void`	`checkErasureCodingSupported(java.lang.String operationName)`	Check whether operation is supported.
`void`	`checkOperation(NameNode.OperationCategory op)`
`void`	`cpLock()`	Lock the checkpoint lock
`void`	`cpLockInterruptibly()`	Lock the checkpoint lock interrupibly
`void`	`cpUnlock()`	Unlock the checkpoint lock
`void`	`gcDeletedSnapshot(java.lang.String snapshotRoot, java.lang.String snapshotName)`
`java.util.List<AuditLogger>`	`getAuditLoggers()`
`int`	`getBlockCapacity()`
`INodeFile`	`getBlockCollection(long id)`
`long`	`getBlockDeletionStartTime()`	Time when block deletions will begin
`BlockManager`	`getBlockManager()`
`java.lang.String`	`getBlockPoolId()`	Gets the block pool id.
`long`	`getBlockPoolUsedSpace()`	Get the total space used by the block pools of this namenode.
`BlocksWithLocations`	`getBlocks(org.apache.hadoop.hdfs.protocol.DatanodeID datanode, long size, long minimumBlockSize, long timeInterval, org.apache.hadoop.fs.StorageType storageType)`	return a list of blocks & their locations on `datanode` whose total size is `size`
`long`	`getBlocksTotal()`	Get the total number of blocks in the system.
`long`	`getBytesInFuture()`	Gets number of bytes in the blocks in future generation stamps.
`long`	`getBytesInFutureECBlockGroups()`	Return total bytes of erasure coded future block groups.
`long`	`getBytesInFutureReplicatedBlocks()`	Return total bytes of future blocks.
`long`	`getCacheCapacity()`	Gets the total cache capacity of the datanode (in bytes).
`CacheManager`	`getCacheManager()`
`long`	`getCacheUsed()`	Gets the amount of cache used by the datanode (in bytes).
`long`	`getCapacityRemaining()`	Free (unused) storage capacity
`float`	`getCapacityRemainingGB()`
`long`	`getCapacityTotal()`	Total storage capacity
`float`	`getCapacityTotalGB()`
`long`	`getCapacityUsed()`	Used storage capacity
`float`	`getCapacityUsedGB()`
`long`	`getCapacityUsedNonDFS()`
`java.lang.String`	`getClusterId()`	Gets the cluster id.
`java.lang.String`	`getCompileInfo()`	Get the compilation information which contains date, user and branch.
`long`	`getCompleteBlocksTotal()`	Get the total number of COMPLETE blocks in the system.
`long`	`getCorruptECBlockGroups()`	Return count of erasure coded block groups that are corrupt.
`java.lang.String`	`getCorruptFiles()`	Get the list of corrupt files.
`int`	`getCorruptFilesCount()`	Get the length of the list of corrupt files.
`long`	`getCorruptReplicaBlocks()`	Returns number of blocks with corrupt replicas
`long`	`getCorruptReplicatedBlocks()`	Return corrupt blocks count.
`java.util.concurrent.locks.ReentrantLock`	`getCpLockForTests()`
`long`	`getCurrentTokensCount()`	Get the current number of delegation tokens in memory.
`java.lang.String`	`getDeadNodes()`	Returned information is a JSON representation of map with host name as the key and value is a map of dead node attribute keys to its values.
`java.lang.String`	`getDecomNodes()`	Returned information is a JSON representation of map with host name as the key and value is a map of decommissioning node attribute keys to its values.
`int`	`getDistinctVersionCount()`	Get the number of distinct versions of live datanodes.
`java.util.Map<java.lang.String,java.lang.Integer>`	`getDistinctVersions()`	Get the number of live datanodes for each distinct versions.
`org.apache.hadoop.hdfs.protocol.ECTopologyVerifierResult`	`getECTopologyResultForPolicies(java.lang.String[] policyNames)`	Verifies if the given policies are supported in the given cluster setup.
`FSEditLog`	`getEditLog()`
`EditLogTailer`	`getEditLogTailer()`
`int`	`getEffectiveLayoutVersion()`	Returns the layout version in effect.
`java.lang.String`	`getEnabledEcPolicies()`	Get the enabled erasure coding policies separated with comma.
`java.lang.String`	`getEnteringMaintenanceNodes()`	Returned information is a JSON representation of map with host name of nodes entering maintenance as the key and value as a map of various node attributes to its values.
`ErasureCodingPolicyManager`	`getErasureCodingPolicyManager()`
`long`	`getEstimatedCapacityLostTotal()`	Returns an estimate of total capacity lost due to volume failures in bytes across all live data nodes.
`long`	`getExcessBlocks()`
`int`	`getExpiredHeartbeats()`
`org.apache.hadoop.fs.BatchedRemoteIterator.BatchedListEntries<org.apache.hadoop.hdfs.protocol.OpenFileEntry>`	`getFilesBlockingDecom(long prevId, java.lang.String path)`
`long`	`getFilesTotal()`	Total number of files and directories
`long`	`getFree()`	Gets total non-used raw bytes.
`FSDirectory`	`getFSDirectory()`
`FSImage`	`getFSImage()`
`java.util.concurrent.locks.ReentrantReadWriteLock`	`getFsLockForTests()`
`int`	`getFsLockQueueLength()`	Returns the length of the wait Queue for the FSNameSystemLock.
`java.lang.String`	`getFSState()`	The state of the file system: Safemode or Operational
`HAContext`	`getHAContext()`
`java.lang.String`	`getHAState()`
`long`	`getHighestPriorityLowRedundancyECBlocks()`	Gets the total number of erasure coded low redundancy blocks on the cluster with the highest risk of loss.
`long`	`getHighestPriorityLowRedundancyReplicatedBlocks()`	Gets the total number of replicated low redundancy blocks on the cluster with the highest risk of loss.
`java.lang.String`	`getJournalTransactionInfo()`	Get information about the transaction ID, including the last applied transaction ID and the most recent checkpoint's transaction ID.
`long`	`getLastCheckpointTime()`
`long`	`getLastWrittenTransactionId()`
`long`	`getLazyPersistFileScrubberTS()`	Used as ad hoc to check the time stamp of the last full cycle of `lazyPersistFileScrubber` daemon.
`long`	`getLeaseRecheckIntervalMs()`
`java.lang.String`	`getLiveNodes()`	Returned information is a JSON representation of map with host name as the key and value is a map of live node attribute keys to its values.
`long`	`getLowRedundancyBlocks()`	Get aggregated count of all blocks with low redundancy.
`long`	`getLowRedundancyECBlockGroups()`	Return count of erasure coded block groups with low redundancy.
`long`	`getLowRedundancyReplicatedBlocks()`	Return low redundancy blocks count.
`int`	`getMaxListOpenFilesResponses()`
`long`	`getMaxLockHoldToReleaseLeaseMs()`
`long`	`getMaxObjects()`	Return the maximum number of inodes in the file system
`long`	`getMillisSinceLastLoadedEdits()`
`long`	`getMissingBlocksCount()`
`long`	`getMissingECBlockGroups()`	Return count of erasure coded block groups that are missing.
`long`	`getMissingReplicatedBlocks()`	Return missing blocks count.
`long`	`getMissingReplicationOneBlocks()`	Return count of missing blocks with replication factor one.
`long`	`getMissingReplOneBlocksCount()`
`java.lang.String`	`getNameDirSize()`	Get namenode directory size.
`java.lang.String`	`getNameDirStatuses()`	Get status information about the directories storing image and edits logs of the NN.
`java.lang.String`	`getNameJournalStatus()`	Get status information about the journals of the NN.
`static java.util.Collection<java.net.URI>`	`getNamespaceDirs(org.apache.hadoop.conf.Configuration conf)`
`static java.util.List<java.net.URI>`	`getNamespaceEditsDirs(org.apache.hadoop.conf.Configuration conf)`	Return an ordered list of edits directories to write to.
`static java.util.List<java.net.URI>`	`getNamespaceEditsDirs(org.apache.hadoop.conf.Configuration conf, boolean includeShared)`
`long`	`getNNStartedTimeInMillis()`	Gets the NN start time in milliseconds.
`java.lang.String`	`getNodeUsage()`	Get Max, Median, Min and Standard Deviation of DataNodes usage.
`long`	`getNonDfsUsedSpace()`	Gets total used space by data nodes for non DFS purposes such as storing temporary files on the local file system.
`long`	`getNumActiveClients()`	Get the total number of active clients holding lease in the system.
`long`	`getNumberOfMissingBlocks()`	Gets the total number of missing blocks on the cluster.
`long`	`getNumberOfMissingBlocksWithReplicationFactorOne()`	Gets the total number of missing blocks on the cluster with replication factor 1.
`long`	`getNumberOfSnapshottableDirs()`	Gets the total number of snapshottable dirs in the system.
`int`	`getNumDeadDataNodes()`	Number of dead data nodes
`int`	`getNumDecomDeadDataNodes()`	Number of decommissioned dead data nodes
`int`	`getNumDecomLiveDataNodes()`	Number of decommissioned Live data nodes
`int`	`getNumDecommissioningDataNodes()`	Number of data nodes that are in the decommissioning state
`int`	`getNumEncryptionZones()`	Return the number of encryption zones in the system.
`int`	`getNumEnteringMaintenanceDataNodes()`
`long`	`getNumFilesUnderConstruction()`	Get the number of files under construction in the system.
`int`	`getNumInMaintenanceDeadDataNodes()`
`int`	`getNumInMaintenanceLiveDataNodes()`
`int`	`getNumInServiceLiveDataNodes()`
`int`	`getNumLiveDataNodes()`	Number of Live data nodes
`long`	`getNumOfReadLockLongHold()`
`long`	`getNumOfWriteLockLongHold()`
`int`	`getNumSnapshots()`
`int`	`getNumSnapshottableDirs()`
`int`	`getNumStaleDataNodes()`	Number of stale data nodes
`int`	`getNumStaleStorages()`	Storages are marked as "content stale" after NN restart or fails over and before NN receives the first Heartbeat followed by the first Blockreport.
`long`	`getNumTimedOutPendingReconstructions()`
`int`	`getPendingDataNodeMessageCount()`
`long`	`getPendingDeletionBlocks()`	Number of blocks pending deletion
`long`	`getPendingDeletionECBlocks()`	Return count of erasure coded blocks that are pending deletion.
`long`	`getPendingDeletionReplicatedBlocks()`	Return count of blocks that are pending deletion.
`long`	`getPendingReconstructionBlocks()`	Get aggregated count of all blocks pending to be reconstructed.
`long`	`getPendingReplicationBlocks()`	Deprecated.
`int`	`getPendingSPSPaths()`	Returns the number of paths to be processed by storage policy satisfier.
`float`	`getPercentBlockPoolUsed()`	Get the total space used by the block pool as percentage of total capacity.
`float`	`getPercentRemaining()`	Gets the total remaining space by data nodes as percentage of total capacity.
`float`	`getPercentUsed()`	Gets the total used space by data nodes as percentage of total capacity.
`long`	`getPostponedMisreplicatedBlocks()`
`long`	`getProvidedCapacity()`	Gets capacity of the provided storage mounted, in bytes.
`long`	`getProvidedCapacityTotal()`	Total PROVIDED storage capacity.
`org.apache.hadoop.crypto.key.KeyProviderCryptoExtension`	`getProvider()`
`int`	`getReadHoldCount()`
`long`	`getReadLockReportingThresholdMs()`
`float`	`getReconstructionQueuesInitProgress()`	Get the progress of the reconstruction queues initialisation.
`static java.util.Collection<java.net.URI>`	`getRequiredNamespaceEditsDirs(org.apache.hadoop.conf.Configuration conf)`	Get all edits dirs which are required.
`org.apache.hadoop.ipc.RetryCache`	`getRetryCache()`
`org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo`	`getRollingUpgradeInfo()`
`org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo.Bean`	`getRollingUpgradeStatus()`	Gets the RollingUpgrade information.
`java.lang.String`	`getSafemode()`	Gets the safemode status.
`long`	`getScheduledReplicationBlocks()`	Blocks scheduled for replication
`org.apache.hadoop.fs.FsServerDefaults`	`getServerDefaults()`
`static java.util.List<java.net.URI>`	`getSharedEditsDirs(org.apache.hadoop.conf.Configuration conf)`	Returns edit directories that are shared between primary and secondary.
`org.apache.hadoop.hdfs.protocol.SnapshotStatus[]`	`getSnapshotListing(java.lang.String snapshotRoot)`	Get the list of snapshots for a given snapshottable directory.
`SnapshotManager`	`getSnapshotManager()`
`java.lang.String`	`getSnapshotStats()`	The statistics of snapshots
`org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus[]`	`getSnapshottableDirListing()`	Get the list of snapshottable directories that are owned by the current user.
`java.lang.String`	`getSoftwareVersion()`	Get the version of software running on the Namenode.
`byte[]`	`getSrcPathsHash(java.lang.String[] srcs)`
`org.apache.hadoop.ha.HAServiceProtocol.HAServiceState`	`getState()`
`int`	`getThreads()`	Gets the number of threads.
`java.lang.String`	`getTopUserOpCounts()`	Returns a nested JSON object listing the top users for different RPC operations over tracked time windows.
`long`	`getTotal()`	Gets total raw bytes including non-dfs used space.
`long`	`getTotalBlocks()`	Gets the total numbers of blocks on the cluster.
`long`	`getTotalECBlockGroups()`	Return total number of erasure coded block groups.
`int`	`getTotalLoad()`	Total number of connections.
`long`	`getTotalReplicatedBlocks()`	Return total number of replicated blocks.
`long`	`getTotalSyncCount()`	Return total number of Sync Operations on FSEditLog.
`java.lang.String`	`getTotalSyncTimes()`	Return total time spent doing sync operations on FSEditLog.
`long`	`getTransactionsSinceLastCheckpoint()`
`long`	`getTransactionsSinceLastLogRoll()`
`long`	`getUnderReplicatedBlocks()`	Deprecated. - Use `getLowRedundancyBlocks()` instead.
`long`	`getUsed()`	Gets the used space by data nodes.
`java.lang.String`	`getVerifyECWithTopologyResult()`	Verifies whether the cluster setup can support all enabled EC policies.
`java.lang.String`	`getVersion()`	Class representing Namenode information for JMX interfaces.
`int`	`getVolumeFailuresTotal()`	Number of failed data volumes across all live data nodes.
`int`	`getWriteHoldCount()`
`long`	`getWriteLockReportingThresholdMs()`
`boolean`	`hasReadLock()`	Check if the current thread holds read lock.
`boolean`	`hasWriteLock()`	Check if the current thread holds write lock.
`boolean`	`inTransitionToActive()`
`boolean`	`isHaEnabled()`
`boolean`	`isInSafeMode()`	Is the system in safe mode?
`boolean`	`isInSnapshot(long blockCollectionID)`
`boolean`	`isInStandbyState()`
`boolean`	`isInStartupSafeMode()`	Is the system in startup safe mode, i.e.
`boolean`	`isMetricsEnabled()`
`boolean`	`isNeedRollbackFsImage()`
`boolean`	`isRollingUpgrade()`	Is rolling upgrade in progress?
`boolean`	`isRunning()`	Is this name system running?
`boolean`	`isUpgradeFinalized()`	Checks if upgrade is finalized.
`void`	`logExpireDelegationToken(org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier id)`	Log the cancellation of expired tokens to edit logs.
`void`	`logUpdateMasterKey(org.apache.hadoop.security.token.delegation.DelegationKey key)`	Log the updateMasterKey operation to edit logs.
`void`	`processIncrementalBlockReport(org.apache.hadoop.hdfs.protocol.DatanodeID nodeID, StorageReceivedDeletedBlocks srdb)`
`void`	`readLock()`	Acquire read lock.
`void`	`readLockInterruptibly()`	Acquire read lock, unless interrupted while waiting
`void`	`readUnlock()`	Release read lock.
`void`	`readUnlock(java.lang.String opName)`	Release read lock with operation name.
`void`	`readUnlock(java.lang.String opName, java.util.function.Supplier<java.lang.String> lockReportInfoSupplier)`
`void`	`removeXattr(long id, java.lang.String xattrName)`	Remove xAttr from the inode.
`void`	`setBlockManagerForTesting(BlockManager bm)`
`void`	`setCreatedRollbackImages(boolean created)`
`void`	`setEditLogTailerForTests(EditLogTailer tailer)`
`void`	`setFSDirectory(FSDirectory dir)`	Set the FSDirectory.
`protected void`	`setImageLoaded(boolean flag)`
`void`	`setMetricsEnabled(boolean metricsEnabled)`
`void`	`setNeedRollbackFsImage(boolean needRollbackFsImage)`
`void`	`setNNResourceChecker(NameNodeResourceChecker nnResourceChecker)`
`void`	`setReadLockReportingThresholdMs(long readLockReportingThresholdMs)`
`void`	`setWriteLockReportingThresholdMs(long writeLockReportingThresholdMs)`
`void`	`startSecretManagerIfNecessary()`
`void`	`verifyToken(org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier identifier, byte[] password)`	Verifies that the given identifier and password are valid and match.
`void`	`writeLock()`	Acquire write lock.
`void`	`writeLockInterruptibly()`	Acquire write lock, unless interrupted while waiting
`void`	`writeUnlock()`	Release write lock.
`void`	`writeUnlock(java.lang.String opName)`	Release write lock with operation name.
`void`	`writeUnlock(java.lang.String opName, boolean suppressWriteLockReport)`
`void`	`writeUnlock(java.lang.String opName, java.util.function.Supplier<java.lang.String> lockReportInfoSupplier)`

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

- Field Detail
  - LOG
```
public static final org.slf4j.Logger LOG
```
  - DFS_NAMENODE_SNAPSHOT_TRASHROOT_ENABLED
```
public static final java.lang.String DFS_NAMENODE_SNAPSHOT_TRASHROOT_ENABLED
```
    See Also:
    
    Constant Field Values
  - DFS_NAMENODE_SNAPSHOT_TRASHROOT_ENABLED_DEFAULT
```
public static final boolean DFS_NAMENODE_SNAPSHOT_TRASHROOT_ENABLED_DEFAULT
```
    See Also:
    
    Constant Field Values
  - AUDIT_LOG
```
public static final org.slf4j.Logger AUDIT_LOG
```
    Logger for audit events, noting successful FSNamesystem operations. Emits to FSNamesystem.audit at INFO. Each event causes a set of tab-separated key=value pairs to be written for the following properties: ugi=<ugi in RPC> ip=<remote IP> cmd=<command> src=<src path> dst=<dst path (optional)> perm=<permissions (optional)>
- Method Detail
  - setImageLoaded
```
protected void setImageLoaded(boolean flag)
```
  - getLazyPersistFileScrubberTS
```
@VisibleForTesting
public long getLazyPersistFileScrubberTS()
```
    Used as ad hoc to check the time stamp of the last full cycle of lazyPersistFileScrubber daemon. This is used by the Junit tests to block until lazyPersistFileScrubberTS is updated.
    
    Returns:
    
    the current lazyPersistFileScrubberTS if lazyPersistFileScrubber is not null.
  - isHaEnabled
```
public boolean isHaEnabled()
```
  - getAuditLoggers
```
@VisibleForTesting
public java.util.List<AuditLogger> getAuditLoggers()
```
  - getRetryCache
```
@VisibleForTesting
public org.apache.hadoop.ipc.RetryCache getRetryCache()
```
  - getLeaseRecheckIntervalMs
```
@VisibleForTesting
public long getLeaseRecheckIntervalMs()
```
  - getMaxLockHoldToReleaseLeaseMs
```
@VisibleForTesting
public long getMaxLockHoldToReleaseLeaseMs()
```
  - getMaxListOpenFilesResponses
```
public int getMaxListOpenFilesResponses()
```
  - getProvider
```
@VisibleForTesting
public org.apache.hadoop.crypto.key.KeyProviderCryptoExtension getProvider()
```
  - startSecretManagerIfNecessary
```
public void startSecretManagerIfNecessary()
```
    Specified by:
    
    startSecretManagerIfNecessary in interface Namesystem
  - inTransitionToActive
```
public boolean inTransitionToActive()
```
    Specified by:
    
    inTransitionToActive in interface Namesystem
    
    Returns:
    
    Whether the namenode is transitioning to active state and is in the middle of the starting active services.
  - checkOperation
```
public void checkOperation(NameNode.OperationCategory op)
                    throws org.apache.hadoop.ipc.StandbyException
```
    Throws:
    
    org.apache.hadoop.ipc.StandbyException
  - getNamespaceDirs
```
public static java.util.Collection<java.net.URI> getNamespaceDirs(org.apache.hadoop.conf.Configuration conf)
```
  - getRequiredNamespaceEditsDirs
```
public static java.util.Collection<java.net.URI> getRequiredNamespaceEditsDirs(org.apache.hadoop.conf.Configuration conf)
```
    Get all edits dirs which are required. If any shared edits dirs are configured, these are also included in the set of required dirs.
    
    Parameters:
    
    conf - the HDFS configuration.
    
    Returns:
    
    all required dirs.
  - getNamespaceEditsDirs
```
public static java.util.List<java.net.URI> getNamespaceEditsDirs(org.apache.hadoop.conf.Configuration conf)
                                                          throws java.io.IOException
```
    Return an ordered list of edits directories to write to. The list is ordered such that all shared edits directories are ordered before non-shared directories, and any duplicates are removed. The order they are specified in the configuration is retained.
    
    Returns:
    
    Collection of shared edits directories.
    
    Throws:
    
    java.io.IOException - if multiple shared edits directories are configured
  - getNamespaceEditsDirs
```
public static java.util.List<java.net.URI> getNamespaceEditsDirs(org.apache.hadoop.conf.Configuration conf,
                                                                 boolean includeShared)
                                                          throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - getSharedEditsDirs
```
public static java.util.List<java.net.URI> getSharedEditsDirs(org.apache.hadoop.conf.Configuration conf)
```
    Returns edit directories that are shared between primary and secondary.
    
    Parameters:
    
    conf - configuration
    
    Returns:
    
    collection of edit directories from conf
  - readLock
```
public void readLock()
```
    Description copied from interface: RwLock
    
    Acquire read lock.
    
    Specified by:
    
    readLock in interface RwLock
  - readLockInterruptibly
```
public void readLockInterruptibly()
                           throws java.lang.InterruptedException
```
    Description copied from interface: RwLock
    
    Acquire read lock, unless interrupted while waiting
    
    Specified by:
    
    readLockInterruptibly in interface RwLock
    
    Throws:
    
    java.lang.InterruptedException
  - readUnlock
```
public void readUnlock()
```
    Description copied from interface: RwLock
    
    Release read lock.
    
    Specified by:
    
    readUnlock in interface RwLock
  - readUnlock
```
public void readUnlock(java.lang.String opName)
```
    Description copied from interface: RwLock
    
    Release read lock with operation name.
    
    Specified by:
    
    readUnlock in interface RwLock
    
    Parameters:
    
    opName - Option name.
  - readUnlock
```
public void readUnlock(java.lang.String opName,
                       java.util.function.Supplier<java.lang.String> lockReportInfoSupplier)
```
  - writeLock
```
public void writeLock()
```
    Description copied from interface: RwLock
    
    Acquire write lock.
    
    Specified by:
    
    writeLock in interface RwLock
  - writeLockInterruptibly
```
public void writeLockInterruptibly()
                            throws java.lang.InterruptedException
```
    Description copied from interface: RwLock
    
    Acquire write lock, unless interrupted while waiting
    
    Specified by:
    
    writeLockInterruptibly in interface RwLock
    
    Throws:
    
    java.lang.InterruptedException
  - writeUnlock
```
public void writeUnlock()
```
    Description copied from interface: RwLock
    
    Release write lock.
    
    Specified by:
    
    writeUnlock in interface RwLock
  - writeUnlock
```
public void writeUnlock(java.lang.String opName)
```
    Description copied from interface: RwLock
    
    Release write lock with operation name.
    
    Specified by:
    
    writeUnlock in interface RwLock
    
    Parameters:
    
    opName - Option name.
  - writeUnlock
```
public void writeUnlock(java.lang.String opName,
                        boolean suppressWriteLockReport)
```
  - writeUnlock
```
public void writeUnlock(java.lang.String opName,
                        java.util.function.Supplier<java.lang.String> lockReportInfoSupplier)
```
  - hasWriteLock
```
public boolean hasWriteLock()
```
    Description copied from interface: RwLock
    
    Check if the current thread holds write lock.
    
    Specified by:
    
    hasWriteLock in interface RwLock
  - hasReadLock
```
public boolean hasReadLock()
```
    Description copied from interface: RwLock
    
    Check if the current thread holds read lock.
    
    Specified by:
    
    hasReadLock in interface RwLock
  - getReadHoldCount
```
public int getReadHoldCount()
```
  - getWriteHoldCount
```
public int getWriteHoldCount()
```
  - cpLock
```
public void cpLock()
```
    Lock the checkpoint lock
  - cpLockInterruptibly
```
public void cpLockInterruptibly()
                         throws java.lang.InterruptedException
```
    Lock the checkpoint lock interrupibly
    
    Throws:
    
    java.lang.InterruptedException
  - cpUnlock
```
public void cpUnlock()
```
    Unlock the checkpoint lock
  - isRunning
```
public boolean isRunning()
```
    Description copied from interface: Namesystem
    
    Is this name system running?
    
    Specified by:
    
    isRunning in interface Namesystem
  - isInStandbyState
```
public boolean isInStandbyState()
```
  - getBlocks
```
public BlocksWithLocations getBlocks(org.apache.hadoop.hdfs.protocol.DatanodeID datanode,
                                     long size,
                                     long minimumBlockSize,
                                     long timeInterval,
                                     org.apache.hadoop.fs.StorageType storageType)
                              throws java.io.IOException
```
    return a list of blocks & their locations on datanode whose total size is size
    
    Parameters:
    
    datanode - on which blocks are located
    
    size - total size of blocks
    
    minimumBlockSize - each block should be of this minimum Block Size
    
    timeInterval - prefer to get blocks which are belong to the cold files accessed before the time interval
    
    storageType - the given storage type StorageType
    
    Throws:
    
    java.io.IOException
  - getFilesBlockingDecom
```
public org.apache.hadoop.fs.BatchedRemoteIterator.BatchedListEntries<org.apache.hadoop.hdfs.protocol.OpenFileEntry> getFilesBlockingDecom(long prevId,
                                                                                                                                          java.lang.String path)
```
  - getServerDefaults
```
@VisibleForTesting
public org.apache.hadoop.fs.FsServerDefaults getServerDefaults()
                                                        throws org.apache.hadoop.ipc.StandbyException
```
    Throws:
    
    org.apache.hadoop.ipc.StandbyException
  - isInSnapshot
```
public boolean isInSnapshot(long blockCollectionID)
```
    Specified by:
    
    isInSnapshot in interface Namesystem
  - getBlockCollection
```
public INodeFile getBlockCollection(long id)
```
    Specified by:
    
    getBlockCollection in interface Namesystem
  - getSrcPathsHash
```
public byte[] getSrcPathsHash(java.lang.String[] srcs)
```
  - getFSImage
```
public FSImage getFSImage()
```
  - getEditLog
```
public FSEditLog getEditLog()
```
  - getMissingBlocksCount
```
@Metric({"MissingBlocks","Number of missing blocks"})
public long getMissingBlocksCount()
```
  - getMissingReplOneBlocksCount
```
@Metric({"MissingReplOneBlocks","Number of missing blocks with replication factor 1"})
public long getMissingReplOneBlocksCount()
```
  - getExpiredHeartbeats
```
@Metric(value={"ExpiredHeartbeats","Number of expired heartbeats"},
        type=COUNTER)
public int getExpiredHeartbeats()
```
  - getTransactionsSinceLastCheckpoint
```
@Metric({"TransactionsSinceLastCheckpoint","Number of transactions since last checkpoint"})
public long getTransactionsSinceLastCheckpoint()
```
  - getTransactionsSinceLastLogRoll
```
@Metric({"TransactionsSinceLastLogRoll","Number of transactions since last edit log roll"})
public long getTransactionsSinceLastLogRoll()
```
  - getLastWrittenTransactionId
```
@Metric({"LastWrittenTransactionId","Transaction ID written to the edit log"})
public long getLastWrittenTransactionId()
```
  - getLastCheckpointTime
```
@Metric({"LastCheckpointTime","Time in milliseconds since the epoch of the last checkpoint"})
public long getLastCheckpointTime()
```
  - getCapacityTotal
```
@Metric({"CapacityTotal","Total raw capacity of data nodes in bytes"})
public long getCapacityTotal()
```
    Description copied from interface: FSNamesystemMBean
    
    Total storage capacity
    
    Specified by:
    
    getCapacityTotal in interface FSNamesystemMBean
    
    Returns:
    
    - total capacity in bytes
  - getCapacityTotalGB
```
@Metric({"CapacityTotalGB","Total raw capacity of data nodes in GB"})
public float getCapacityTotalGB()
```
  - getCapacityUsed
```
@Metric({"CapacityUsed","Total used capacity across all data nodes in bytes"})
public long getCapacityUsed()
```
    Description copied from interface: FSNamesystemMBean
    
    Used storage capacity
    
    Specified by:
    
    getCapacityUsed in interface FSNamesystemMBean
    
    Returns:
    
    - used capacity in bytes
  - getCapacityUsedGB
```
@Metric({"CapacityUsedGB","Total used capacity across all data nodes in GB"})
public float getCapacityUsedGB()
```
  - getCapacityRemaining
```
@Metric({"CapacityRemaining","Remaining capacity in bytes"})
public long getCapacityRemaining()
```
    Description copied from interface: FSNamesystemMBean
    
    Free (unused) storage capacity
    
    Specified by:
    
    getCapacityRemaining in interface FSNamesystemMBean
    
    Returns:
    
    - free capacity in bytes
  - getProvidedCapacityTotal
```
@Metric({"ProvidedCapacityTotal","Total space used in PROVIDED storage in bytes"})
public long getProvidedCapacityTotal()
```
    Description copied from interface: FSNamesystemMBean
    
    Total PROVIDED storage capacity.
    
    Specified by:
    
    getProvidedCapacityTotal in interface FSNamesystemMBean
    
    Returns:
    
    - total PROVIDED storage capacity in bytes
  - getCapacityRemainingGB
```
@Metric({"CapacityRemainingGB","Remaining capacity in GB"})
public float getCapacityRemainingGB()
```
  - getCapacityUsedNonDFS
```
@Metric({"CapacityUsedNonDFS","Total space used by data nodes for non DFS purposes in bytes"})
public long getCapacityUsedNonDFS()
```
  - getTotalLoad
```
@Metric
public int getTotalLoad()
```
    Total number of connections.
    
    Specified by:
    
    getTotalLoad in interface FSNamesystemMBean
    
    Returns:
    
    - total load of FSNamesystem
  - getNumSnapshottableDirs
```
@Metric({"SnapshottableDirectories","Number of snapshottable directories"})
public int getNumSnapshottableDirs()
```
  - getNumSnapshots
```
@Metric({"Snapshots","The number of snapshots"})
public int getNumSnapshots()
```
  - getSnapshotStats
```
public java.lang.String getSnapshotStats()
```
    Description copied from interface: FSNamesystemMBean
    
    The statistics of snapshots
    
    Specified by:
    
    getSnapshotStats in interface FSNamesystemMBean
  - getNumEncryptionZones
```
@Metric({"NumEncryptionZones","The number of encryption zones"})
public int getNumEncryptionZones()
```
    Description copied from interface: FSNamesystemMBean
    
    Return the number of encryption zones in the system.
    
    Specified by:
    
    getNumEncryptionZones in interface FSNamesystemMBean
  - getCurrentTokensCount
```
@Metric({"CurrentTokensCount","The number of delegation tokens"})
public long getCurrentTokensCount()
```
    Description copied from interface: FSNamesystemMBean
    
    Get the current number of delegation tokens in memory.
    
    Specified by:
    
    getCurrentTokensCount in interface FSNamesystemMBean
    
    Returns:
    
    number of DTs
  - getPendingSPSPaths
```
@Metric({"PendingSPSPaths","The number of paths to be processed by storage policy satisfier"})
public int getPendingSPSPaths()
```
    Description copied from interface: FSNamesystemMBean
    
    Returns the number of paths to be processed by storage policy satisfier.
    
    Specified by:
    
    getPendingSPSPaths in interface FSNamesystemMBean
    
    Returns:
    
    The number of paths to be processed by sps.
  - getReconstructionQueuesInitProgress
```
@Metric
public float getReconstructionQueuesInitProgress()
```
    Get the progress of the reconstruction queues initialisation.
    
    Specified by:
    
    getReconstructionQueuesInitProgress in interface FSNamesystemMBean
    
    Returns:
    
    Returns values between 0 and 1 for the progress.
  - getFsLockQueueLength
```
@Metric({"LockQueueLength","Number of threads waiting to acquire FSNameSystemLock"})
public int getFsLockQueueLength()
```
    Returns the length of the wait Queue for the FSNameSystemLock. A larger number here indicates lots of threads are waiting for FSNameSystemLock.
    
    Specified by:
    
    getFsLockQueueLength in interface FSNamesystemMBean
    
    Returns:
    
    int - Number of Threads waiting to acquire FSNameSystemLock
  - getNumOfReadLockLongHold
```
@Metric(value={"ReadLockLongHoldCount","The number of time the read lock has been held for longer than the threshold"},
        type=COUNTER)
public long getNumOfReadLockLongHold()
```
  - getNumOfWriteLockLongHold
```
@Metric(value={"WriteLockLongHoldCount","The number of time the write lock has been held for longer than the threshold"},
        type=COUNTER)
public long getNumOfWriteLockLongHold()
```
  - getBlocksTotal
```
@Metric
public long getBlocksTotal()
```
    Get the total number of blocks in the system.
    
    Specified by:
    
    getBlocksTotal in interface FSNamesystemMBean
    
    Returns:
    
    - number of allocated blocks
  - getNumFilesUnderConstruction
```
@Metric({"NumFilesUnderConstruction","Number of files under construction"})
public long getNumFilesUnderConstruction()
```
    Get the number of files under construction in the system.
  - getNumActiveClients
```
@Metric({"NumActiveClients","Number of active clients holding lease"})
public long getNumActiveClients()
```
    Get the total number of active clients holding lease in the system.
  - getCompleteBlocksTotal
```
public long getCompleteBlocksTotal()
```
    Get the total number of COMPLETE blocks in the system. For safe mode only complete blocks are counted. This is invoked only during NN startup and checkpointing.
  - isInSafeMode
```
public boolean isInSafeMode()
```
    Description copied from interface: SafeMode
    
    Is the system in safe mode?
    
    Specified by:
    
    isInSafeMode in interface SafeMode
  - isInStartupSafeMode
```
public boolean isInStartupSafeMode()
```
    Description copied from interface: SafeMode
    
    Is the system in startup safe mode, i.e. the system is starting up with safe mode turned on automatically?
    
    Specified by:
    
    isInStartupSafeMode in interface SafeMode
  - processIncrementalBlockReport
```
public void processIncrementalBlockReport(org.apache.hadoop.hdfs.protocol.DatanodeID nodeID,
                                          StorageReceivedDeletedBlocks srdb)
                                   throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - getMaxObjects
```
public long getMaxObjects()
```
    Description copied from interface: FSNamesystemMBean
    
    Return the maximum number of inodes in the file system
    
    Specified by:
    
    getMaxObjects in interface FSNamesystemMBean
  - getFilesTotal
```
@Metric
public long getFilesTotal()
```
    Description copied from interface: FSNamesystemMBean
    
    Total number of files and directories
    
    Specified by:
    
    getFilesTotal in interface FSNamesystemMBean
    
    Returns:
    
    - num of files and directories
  - getPendingReplicationBlocks
```
@Metric
@Deprecated
public long getPendingReplicationBlocks()
```
    Deprecated.
    
    Get aggregated count of all blocks pending to be reconstructed.
    
    Specified by:
    
    getPendingReplicationBlocks in interface FSNamesystemMBean
  - getPendingReconstructionBlocks
```
@Metric
public long getPendingReconstructionBlocks()
```
    Get aggregated count of all blocks pending to be reconstructed.
    
    Specified by:
    
    getPendingReconstructionBlocks in interface FSNamesystemMBean
    
    Returns:
    
    Number of blocks to be replicated.
  - getUnderReplicatedBlocks
```
@Metric
@Deprecated
public long getUnderReplicatedBlocks()
```
    Deprecated.
    - Use getLowRedundancyBlocks() instead.
    
    Get aggregated count of all blocks with low redundancy.
    
    Specified by:
    
    getUnderReplicatedBlocks in interface FSNamesystemMBean
  - getLowRedundancyBlocks
```
@Metric
public long getLowRedundancyBlocks()
```
    Get aggregated count of all blocks with low redundancy.
    
    Specified by:
    
    getLowRedundancyBlocks in interface FSNamesystemMBean
    
    Returns:
    
    Number of blocks with low redundancy.
  - getCorruptReplicaBlocks
```
@Metric({"CorruptBlocks","Number of blocks with corrupt replicas"})
public long getCorruptReplicaBlocks()
```
    Returns number of blocks with corrupt replicas
  - getScheduledReplicationBlocks
```
@Metric
public long getScheduledReplicationBlocks()
```
    Description copied from interface: FSNamesystemMBean
    
    Blocks scheduled for replication
    
    Specified by:
    
    getScheduledReplicationBlocks in interface FSNamesystemMBean
    
    Returns:
    
    - num of blocks scheduled for replication
  - getPendingDeletionBlocks
```
@Metric
public long getPendingDeletionBlocks()
```
    Description copied from interface: FSNamesystemMBean
    
    Number of blocks pending deletion
    
    Specified by:
    
    getPendingDeletionBlocks in interface FSNamesystemMBean
    
    Returns:
    
    number of blocks pending deletion
  - getLowRedundancyReplicatedBlocks
```
@Metric({"LowRedundancyReplicatedBlocks","Number of low redundancy replicated blocks"})
public long getLowRedundancyReplicatedBlocks()
```
    Description copied from interface: ReplicatedBlocksMBean
    
    Return low redundancy blocks count.
    
    Specified by:
    
    getLowRedundancyReplicatedBlocks in interface ReplicatedBlocksMBean
  - getCorruptReplicatedBlocks
```
@Metric({"CorruptReplicatedBlocks","Number of corrupted replicated blocks"})
public long getCorruptReplicatedBlocks()
```
    Description copied from interface: ReplicatedBlocksMBean
    
    Return corrupt blocks count.
    
    Specified by:
    
    getCorruptReplicatedBlocks in interface ReplicatedBlocksMBean
  - getMissingReplicatedBlocks
```
@Metric({"MissingReplicatedBlocks","Number of missing replicated blocks"})
public long getMissingReplicatedBlocks()
```
    Description copied from interface: ReplicatedBlocksMBean
    
    Return missing blocks count.
    
    Specified by:
    
    getMissingReplicatedBlocks in interface ReplicatedBlocksMBean
  - getMissingReplicationOneBlocks
```
@Metric({"MissingReplicationOneBlocks","Number of missing replicated blocks with replication factor 1"})
public long getMissingReplicationOneBlocks()
```
    Description copied from interface: ReplicatedBlocksMBean
    
    Return count of missing blocks with replication factor one.
    
    Specified by:
    
    getMissingReplicationOneBlocks in interface ReplicatedBlocksMBean
  - getHighestPriorityLowRedundancyReplicatedBlocks
```
@Metric({"HighestPriorityLowRedundancyReplicatedBlocks","Number of replicated blocks which have the highest risk of loss."})
public long getHighestPriorityLowRedundancyReplicatedBlocks()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total number of replicated low redundancy blocks on the cluster with the highest risk of loss.
    
    Specified by:
    
    getHighestPriorityLowRedundancyReplicatedBlocks in interface NameNodeMXBean
    
    Returns:
    
    the total number of low redundancy blocks on the cluster with the highest risk of loss.
  - getHighestPriorityLowRedundancyECBlocks
```
@Metric({"HighestPriorityLowRedundancyECBlocks","Number of erasure coded blocks which have the highest risk of loss."})
public long getHighestPriorityLowRedundancyECBlocks()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total number of erasure coded low redundancy blocks on the cluster with the highest risk of loss.
    
    Specified by:
    
    getHighestPriorityLowRedundancyECBlocks in interface NameNodeMXBean
    
    Returns:
    
    the total number of low redundancy blocks on the cluster with the highest risk of loss.
  - getBytesInFutureReplicatedBlocks
```
@Metric({"BytesInFutureReplicatedBlocks","Total bytes in replicated blocks with future generation stamp"})
public long getBytesInFutureReplicatedBlocks()
```
    Description copied from interface: ReplicatedBlocksMBean
    
    Return total bytes of future blocks.
    
    Specified by:
    
    getBytesInFutureReplicatedBlocks in interface ReplicatedBlocksMBean
  - getPendingDeletionReplicatedBlocks
```
@Metric({"PendingDeletionReplicatedBlocks","Number of replicated blocks that are pending deletion"})
public long getPendingDeletionReplicatedBlocks()
```
    Description copied from interface: ReplicatedBlocksMBean
    
    Return count of blocks that are pending deletion.
    
    Specified by:
    
    getPendingDeletionReplicatedBlocks in interface ReplicatedBlocksMBean
  - getTotalReplicatedBlocks
```
@Metric({"TotalReplicatedBlocks","Total number of replicated blocks"})
public long getTotalReplicatedBlocks()
```
    Description copied from interface: ReplicatedBlocksMBean
    
    Return total number of replicated blocks.
    
    Specified by:
    
    getTotalReplicatedBlocks in interface ReplicatedBlocksMBean
  - getLowRedundancyECBlockGroups
```
@Metric({"LowRedundancyECBlockGroups","Number of erasure coded block groups with low redundancy"})
public long getLowRedundancyECBlockGroups()
```
    Description copied from interface: ECBlockGroupsMBean
    
    Return count of erasure coded block groups with low redundancy.
    
    Specified by:
    
    getLowRedundancyECBlockGroups in interface ECBlockGroupsMBean
  - getCorruptECBlockGroups
```
@Metric({"CorruptECBlockGroups","Number of erasure coded block groups that are corrupt"})
public long getCorruptECBlockGroups()
```
    Description copied from interface: ECBlockGroupsMBean
    
    Return count of erasure coded block groups that are corrupt.
    
    Specified by:
    
    getCorruptECBlockGroups in interface ECBlockGroupsMBean
  - getMissingECBlockGroups
```
@Metric({"MissingECBlockGroups","Number of erasure coded block groups that are missing"})
public long getMissingECBlockGroups()
```
    Description copied from interface: ECBlockGroupsMBean
    
    Return count of erasure coded block groups that are missing.
    
    Specified by:
    
    getMissingECBlockGroups in interface ECBlockGroupsMBean
  - getBytesInFutureECBlockGroups
```
@Metric({"BytesInFutureECBlockGroups","Total bytes in erasure coded block groups with future generation stamp"})
public long getBytesInFutureECBlockGroups()
```
    Description copied from interface: ECBlockGroupsMBean
    
    Return total bytes of erasure coded future block groups.
    
    Specified by:
    
    getBytesInFutureECBlockGroups in interface ECBlockGroupsMBean
  - getPendingDeletionECBlocks
```
@Metric({"PendingDeletionECBlocks","Number of erasure coded blocks that are pending deletion"})
public long getPendingDeletionECBlocks()
```
    Description copied from interface: ECBlockGroupsMBean
    
    Return count of erasure coded blocks that are pending deletion.
    
    Specified by:
    
    getPendingDeletionECBlocks in interface ECBlockGroupsMBean
  - getTotalECBlockGroups
```
@Metric({"TotalECBlockGroups","Total number of erasure coded block groups"})
public long getTotalECBlockGroups()
```
    Description copied from interface: ECBlockGroupsMBean
    
    Return total number of erasure coded block groups.
    
    Specified by:
    
    getTotalECBlockGroups in interface ECBlockGroupsMBean
  - getEnabledEcPolicies
```
@Metric({"EnabledEcPolicies","Enabled erasure coding policies"})
public java.lang.String getEnabledEcPolicies()
```
    Get the enabled erasure coding policies separated with comma.
    
    Specified by:
    
    getEnabledEcPolicies in interface ECBlockGroupsMBean
    
    Returns:
    
    the enabled erasure coding policies separated with comma.
  - getBlockDeletionStartTime
```
public long getBlockDeletionStartTime()
```
    Description copied from interface: FSNamesystemMBean
    
    Time when block deletions will begin
    
    Specified by:
    
    getBlockDeletionStartTime in interface FSNamesystemMBean
    
    Returns:
    
    time when block deletions will begin
  - getExcessBlocks
```
@Metric
public long getExcessBlocks()
```
  - getNumTimedOutPendingReconstructions
```
@Metric
public long getNumTimedOutPendingReconstructions()
```
  - getPostponedMisreplicatedBlocks
```
@Metric
public long getPostponedMisreplicatedBlocks()
```
  - getPendingDataNodeMessageCount
```
@Metric
public int getPendingDataNodeMessageCount()
```
  - getHAState
```
@Metric
public java.lang.String getHAState()
```
  - getMillisSinceLastLoadedEdits
```
@Metric
public long getMillisSinceLastLoadedEdits()
```
  - getBlockCapacity
```
@Metric
public int getBlockCapacity()
```
  - getState
```
public org.apache.hadoop.ha.HAServiceProtocol.HAServiceState getState()
```
  - getFSState
```
public java.lang.String getFSState()
```
    Description copied from interface: FSNamesystemMBean
    
    The state of the file system: Safemode or Operational
    
    Specified by:
    
    getFSState in interface FSNamesystemMBean
    
    Returns:
    
    the state
  - getNumLiveDataNodes
```
@Metric({"NumLiveDataNodes","Number of datanodes which are currently live"})
public int getNumLiveDataNodes()
```
    Description copied from interface: FSNamesystemMBean
    
    Number of Live data nodes
    
    Specified by:
    
    getNumLiveDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    number of live data nodes
  - getNumDeadDataNodes
```
@Metric({"NumDeadDataNodes","Number of datanodes which are currently dead"})
public int getNumDeadDataNodes()
```
    Description copied from interface: FSNamesystemMBean
    
    Number of dead data nodes
    
    Specified by:
    
    getNumDeadDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    number of dead data nodes
  - getNumDecomLiveDataNodes
```
@Metric({"NumDecomLiveDataNodes","Number of datanodes which have been decommissioned and are now live"})
public int getNumDecomLiveDataNodes()
```
    Description copied from interface: FSNamesystemMBean
    
    Number of decommissioned Live data nodes
    
    Specified by:
    
    getNumDecomLiveDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    number of decommissioned live data nodes
  - getNumDecomDeadDataNodes
```
@Metric({"NumDecomDeadDataNodes","Number of datanodes which have been decommissioned and are now dead"})
public int getNumDecomDeadDataNodes()
```
    Description copied from interface: FSNamesystemMBean
    
    Number of decommissioned dead data nodes
    
    Specified by:
    
    getNumDecomDeadDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    number of decommissioned dead data nodes
  - getNumInServiceLiveDataNodes
```
@Metric({"NumInServiceLiveDataNodes","Number of live datanodes which are currently in service"})
public int getNumInServiceLiveDataNodes()
```
    Specified by:
    
    getNumInServiceLiveDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    Number of in-service data nodes, where NumInServiceDataNodes = NumLiveDataNodes - NumDecomLiveDataNodes - NumInMaintenanceLiveDataNodes
  - getVolumeFailuresTotal
```
@Metric({"VolumeFailuresTotal","Total number of volume failures across all Datanodes"})
public int getVolumeFailuresTotal()
```
    Description copied from interface: FSNamesystemMBean
    
    Number of failed data volumes across all live data nodes.
    
    Specified by:
    
    getVolumeFailuresTotal in interface FSNamesystemMBean
    
    Returns:
    
    number of failed data volumes across all live data nodes
  - getEstimatedCapacityLostTotal
```
@Metric({"EstimatedCapacityLostTotal","An estimate of the total capacity lost due to volume failures"})
public long getEstimatedCapacityLostTotal()
```
    Description copied from interface: FSNamesystemMBean
    
    Returns an estimate of total capacity lost due to volume failures in bytes across all live data nodes.
    
    Specified by:
    
    getEstimatedCapacityLostTotal in interface FSNamesystemMBean
    
    Returns:
    
    estimate of total capacity lost in bytes
  - getNumDecommissioningDataNodes
```
@Metric({"NumDecommissioningDataNodes","Number of datanodes in decommissioning state"})
public int getNumDecommissioningDataNodes()
```
    Description copied from interface: FSNamesystemMBean
    
    Number of data nodes that are in the decommissioning state
    
    Specified by:
    
    getNumDecommissioningDataNodes in interface FSNamesystemMBean
  - getNumStaleDataNodes
```
@Metric({"StaleDataNodes","Number of datanodes marked stale due to delayed heartbeat"})
public int getNumStaleDataNodes()
```
    Description copied from interface: FSNamesystemMBean
    
    Number of stale data nodes
    
    Specified by:
    
    getNumStaleDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    number of stale data nodes
  - getNumStaleStorages
```
@Metric({"NumStaleStorages","Number of storages marked as content stale"})
public int getNumStaleStorages()
```
    Storages are marked as "content stale" after NN restart or fails over and before NN receives the first Heartbeat followed by the first Blockreport.
    
    Specified by:
    
    getNumStaleStorages in interface FSNamesystemMBean
    
    Returns:
    
    number of content stale storages
  - getTopUserOpCounts
```
public java.lang.String getTopUserOpCounts()
```
    Description copied from interface: FSNamesystemMBean
    
    Returns a nested JSON object listing the top users for different RPC operations over tracked time windows.
    
    Specified by:
    
    getTopUserOpCounts in interface FSNamesystemMBean
    
    Returns:
    
    JSON string
  - logUpdateMasterKey
```
public void logUpdateMasterKey(org.apache.hadoop.security.token.delegation.DelegationKey key)
```
    Log the updateMasterKey operation to edit logs.
    
    Parameters:
    
    key - new delegation key.
  - logExpireDelegationToken
```
public void logExpireDelegationToken(org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier id)
```
    Log the cancellation of expired tokens to edit logs.
    
    Parameters:
    
    id - token identifier to cancel
  - getVersion
```
public java.lang.String getVersion()
```
    Class representing Namenode information for JMX interfaces.
    
    Specified by:
    
    getVersion in interface NameNodeMXBean
    
    Returns:
    
    the version.
  - getUsed
```
public long getUsed()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the used space by data nodes.
    
    Specified by:
    
    getUsed in interface NameNodeMXBean
    
    Returns:
    
    the used space by data nodes.
  - getFree
```
public long getFree()
```
    Description copied from interface: NameNodeMXBean
    
    Gets total non-used raw bytes.
    
    Specified by:
    
    getFree in interface NameNodeMXBean
    
    Returns:
    
    total non-used raw bytes.
  - getTotal
```
public long getTotal()
```
    Description copied from interface: NameNodeMXBean
    
    Gets total raw bytes including non-dfs used space.
    
    Specified by:
    
    getTotal in interface NameNodeMXBean
    
    Returns:
    
    the total raw bytes including non-dfs used space.
  - getProvidedCapacity
```
public long getProvidedCapacity()
```
    Description copied from interface: NameNodeMXBean
    
    Gets capacity of the provided storage mounted, in bytes.
    
    Specified by:
    
    getProvidedCapacity in interface NameNodeMXBean
    
    Returns:
    
    the total raw bytes present in the provided storage.
  - getSafemode
```
public java.lang.String getSafemode()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the safemode status.
    
    Specified by:
    
    getSafemode in interface NameNodeMXBean
    
    Returns:
    
    the safemode status.
  - isUpgradeFinalized
```
public boolean isUpgradeFinalized()
```
    Description copied from interface: NameNodeMXBean
    
    Checks if upgrade is finalized.
    
    Specified by:
    
    isUpgradeFinalized in interface NameNodeMXBean
    
    Returns:
    
    true, if upgrade is finalized.
  - getNonDfsUsedSpace
```
public long getNonDfsUsedSpace()
```
    Description copied from interface: NameNodeMXBean
    
    Gets total used space by data nodes for non DFS purposes such as storing temporary files on the local file system.
    
    Specified by:
    
    getNonDfsUsedSpace in interface NameNodeMXBean
    
    Returns:
    
    the non dfs space of the cluster.
  - getPercentUsed
```
public float getPercentUsed()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total used space by data nodes as percentage of total capacity.
    
    Specified by:
    
    getPercentUsed in interface NameNodeMXBean
    
    Returns:
    
    the percentage of used space on the cluster.
  - getBlockPoolUsedSpace
```
public long getBlockPoolUsedSpace()
```
    Description copied from interface: NameNodeMXBean
    
    Get the total space used by the block pools of this namenode.
    
    Specified by:
    
    getBlockPoolUsedSpace in interface NameNodeMXBean
    
    Returns:
    
    the total space used by the block pools of this namenode.
  - getPercentBlockPoolUsed
```
public float getPercentBlockPoolUsed()
```
    Description copied from interface: NameNodeMXBean
    
    Get the total space used by the block pool as percentage of total capacity.
    
    Specified by:
    
    getPercentBlockPoolUsed in interface NameNodeMXBean
    
    Returns:
    
    the total space used by the block pool as percentage of total capacity.
  - getPercentRemaining
```
public float getPercentRemaining()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total remaining space by data nodes as percentage of total capacity.
    
    Specified by:
    
    getPercentRemaining in interface NameNodeMXBean
    
    Returns:
    
    the percentage of the remaining space on the cluster.
  - getCacheCapacity
```
public long getCacheCapacity()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total cache capacity of the datanode (in bytes).
    
    Specified by:
    
    getCacheCapacity in interface NameNodeMXBean
    
    Returns:
    
    the total cache capacity of the datanode (in bytes).
  - getCacheUsed
```
public long getCacheUsed()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the amount of cache used by the datanode (in bytes).
    
    Specified by:
    
    getCacheUsed in interface NameNodeMXBean
    
    Returns:
    
    the amount of cache used by the datanode (in bytes).
  - getTotalBlocks
```
public long getTotalBlocks()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total numbers of blocks on the cluster.
    
    Specified by:
    
    getTotalBlocks in interface NameNodeMXBean
    
    Returns:
    
    the total number of blocks of the cluster.
  - getNumberOfMissingBlocks
```
public long getNumberOfMissingBlocks()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total number of missing blocks on the cluster.
    
    Specified by:
    
    getNumberOfMissingBlocks in interface NameNodeMXBean
    
    Returns:
    
    the total number of missing blocks on the cluster.
  - getNumberOfMissingBlocksWithReplicationFactorOne
```
public long getNumberOfMissingBlocksWithReplicationFactorOne()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total number of missing blocks on the cluster with replication factor 1.
    
    Specified by:
    
    getNumberOfMissingBlocksWithReplicationFactorOne in interface NameNodeMXBean
    
    Returns:
    
    the total number of missing blocks on the cluster with replication factor 1.
  - getThreads
```
public int getThreads()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the number of threads.
    
    Specified by:
    
    getThreads in interface NameNodeMXBean
    
    Returns:
    
    the number of threads.
  - getLiveNodes
```
public java.lang.String getLiveNodes()
```
    Returned information is a JSON representation of map with host name as the key and value is a map of live node attribute keys to its values.
    
    Specified by:
    
    getLiveNodes in interface NameNodeMXBean
    
    Returns:
    
    the live node information.
  - getDeadNodes
```
public java.lang.String getDeadNodes()
```
    Returned information is a JSON representation of map with host name as the key and value is a map of dead node attribute keys to its values.
    
    Specified by:
    
    getDeadNodes in interface NameNodeMXBean
    
    Returns:
    
    the dead node information.
  - getDecomNodes
```
public java.lang.String getDecomNodes()
```
    Returned information is a JSON representation of map with host name as the key and value is a map of decommissioning node attribute keys to its values.
    
    Specified by:
    
    getDecomNodes in interface NameNodeMXBean
    
    Returns:
    
    the decommissioning node information.
  - getEnteringMaintenanceNodes
```
public java.lang.String getEnteringMaintenanceNodes()
```
    Returned information is a JSON representation of map with host name of nodes entering maintenance as the key and value as a map of various node attributes to its values.
    
    Specified by:
    
    getEnteringMaintenanceNodes in interface NameNodeMXBean
    
    Returns:
    
    the information on nodes entering maintenance.
  - getClusterId
```
public java.lang.String getClusterId()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the cluster id.
    
    Specified by:
    
    getClusterId in interface NameNodeMXBean
    
    Returns:
    
    the cluster id.
  - getBlockPoolId
```
public java.lang.String getBlockPoolId()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the block pool id.
    
    Specified by:
    
    getBlockPoolId in interface NameNodeMXBean
    
    Returns:
    
    the block pool id.
  - getNameDirStatuses
```
public java.lang.String getNameDirStatuses()
```
    Description copied from interface: NameNodeMXBean
    
    Get status information about the directories storing image and edits logs of the NN.
    
    Specified by:
    
    getNameDirStatuses in interface NameNodeMXBean
    
    Returns:
    
    the name dir status information, as a JSON string.
  - getNodeUsage
```
public java.lang.String getNodeUsage()
```
    Description copied from interface: NameNodeMXBean
    
    Get Max, Median, Min and Standard Deviation of DataNodes usage.
    
    Specified by:
    
    getNodeUsage in interface NameNodeMXBean
    
    Returns:
    
    the DataNode usage information, as a JSON string.
  - getNameJournalStatus
```
public java.lang.String getNameJournalStatus()
```
    Description copied from interface: NameNodeMXBean
    
    Get status information about the journals of the NN.
    
    Specified by:
    
    getNameJournalStatus in interface NameNodeMXBean
    
    Returns:
    
    the name journal status information, as a JSON string.
  - getJournalTransactionInfo
```
public java.lang.String getJournalTransactionInfo()
```
    Description copied from interface: NameNodeMXBean
    
    Get information about the transaction ID, including the last applied transaction ID and the most recent checkpoint's transaction ID.
    
    Specified by:
    
    getJournalTransactionInfo in interface NameNodeMXBean
    
    Returns:
    
    information about the transaction ID.
  - getNNStartedTimeInMillis
```
public long getNNStartedTimeInMillis()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the NN start time in milliseconds.
    
    Specified by:
    
    getNNStartedTimeInMillis in interface NameNodeMXBean
    
    Returns:
    
    the NN start time in msec.
  - getCompileInfo
```
public java.lang.String getCompileInfo()
```
    Description copied from interface: NameNodeMXBean
    
    Get the compilation information which contains date, user and branch.
    
    Specified by:
    
    getCompileInfo in interface NameNodeMXBean
    
    Returns:
    
    the compilation information, as a JSON string.
  - getBlockManager
```
public BlockManager getBlockManager()
```
    Returns:
    
    the block manager.
  - setBlockManagerForTesting
```
@VisibleForTesting
public void setBlockManagerForTesting(BlockManager bm)
```
  - getFSDirectory
```
public FSDirectory getFSDirectory()
```
    Specified by:
    
    getFSDirectory in interface Namesystem
    
    Returns:
    
    the FSDirectory.
  - setFSDirectory
```
@VisibleForTesting
public void setFSDirectory(FSDirectory dir)
```
    Set the FSDirectory.
  - getCacheManager
```
public CacheManager getCacheManager()
```
    Specified by:
    
    getCacheManager in interface Namesystem
    
    Returns:
    
    the cache manager.
  - getErasureCodingPolicyManager
```
public ErasureCodingPolicyManager getErasureCodingPolicyManager()
```
    Returns:
    
    the ErasureCodingPolicyManager.
  - getHAContext
```
public HAContext getHAContext()
```
    Specified by:
    
    getHAContext in interface Namesystem
  - getCorruptFiles
```
public java.lang.String getCorruptFiles()
```
    Description copied from interface: NameNodeMXBean
    
    Get the list of corrupt files.
    
    Specified by:
    
    getCorruptFiles in interface NameNodeMXBean
    
    Returns:
    
    the list of corrupt files, as a JSON string.
  - getCorruptFilesCount
```
public int getCorruptFilesCount()
```
    Description copied from interface: NameNodeMXBean
    
    Get the length of the list of corrupt files.
    
    Specified by:
    
    getCorruptFilesCount in interface NameNodeMXBean
    
    Returns:
    
    the length of the list of corrupt files.
  - getNumberOfSnapshottableDirs
```
public long getNumberOfSnapshottableDirs()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the total number of snapshottable dirs in the system.
    
    Specified by:
    
    getNumberOfSnapshottableDirs in interface NameNodeMXBean
    
    Returns:
    
    the total number of snapshottable dirs in the system.
  - getDistinctVersionCount
```
public int getDistinctVersionCount()
```
    Description copied from interface: NameNodeMXBean
    
    Get the number of distinct versions of live datanodes.
    
    Specified by:
    
    getDistinctVersionCount in interface NameNodeMXBean
    
    Returns:
    
    the number of distinct versions of live datanodes.
  - getDistinctVersions
```
public java.util.Map<java.lang.String,java.lang.Integer> getDistinctVersions()
```
    Description copied from interface: NameNodeMXBean
    
    Get the number of live datanodes for each distinct versions.
    
    Specified by:
    
    getDistinctVersions in interface NameNodeMXBean
    
    Returns:
    
    the number of live datanodes for each distinct versions.
  - getSoftwareVersion
```
public java.lang.String getSoftwareVersion()
```
    Description copied from interface: NameNodeMXBean
    
    Get the version of software running on the Namenode.
    
    Specified by:
    
    getSoftwareVersion in interface NameNodeMXBean
    
    Returns:
    
    a string representing the version.
  - getNameDirSize
```
public java.lang.String getNameDirSize()
```
    Description copied from interface: NameNodeMXBean
    
    Get namenode directory size.
    
    Specified by:
    
    getNameDirSize in interface NameNodeMXBean
    
    Returns:
    
    namenode directory size.
  - verifyToken
```
public void verifyToken(org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier identifier,
                        byte[] password)
                 throws org.apache.hadoop.security.token.SecretManager.InvalidToken,
                        org.apache.hadoop.ipc.RetriableException
```
    Verifies that the given identifier and password are valid and match.
    
    Parameters:
    
    identifier - Token identifier.
    
    password - Password in the token.
    
    Throws:
    
    org.apache.hadoop.security.token.SecretManager.InvalidToken
    
    org.apache.hadoop.ipc.RetriableException
  - getEditLogTailer
```
@VisibleForTesting
public EditLogTailer getEditLogTailer()
```
  - setEditLogTailerForTests
```
@VisibleForTesting
public void setEditLogTailerForTests(EditLogTailer tailer)
```
  - getFsLockForTests
```
@VisibleForTesting
public java.util.concurrent.locks.ReentrantReadWriteLock getFsLockForTests()
```
  - getCpLockForTests
```
@VisibleForTesting
public java.util.concurrent.locks.ReentrantLock getCpLockForTests()
```
  - setNNResourceChecker
```
@VisibleForTesting
public void setNNResourceChecker(NameNodeResourceChecker nnResourceChecker)
```
  - getSnapshotManager
```
public SnapshotManager getSnapshotManager()
```
  - getSnapshottableDirListing
```
public org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus[] getSnapshottableDirListing()
                                                                                          throws java.io.IOException
```
    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.
    
    Returns:
    
    The list of all the current snapshottable directories.
    
    Throws:
    
    java.io.IOException - If an I/O error occurred.
  - getSnapshotListing
```
public org.apache.hadoop.hdfs.protocol.SnapshotStatus[] getSnapshotListing(java.lang.String snapshotRoot)
                                                                    throws java.io.IOException
```
    Get the list of snapshots for a given snapshottable directory.
    
    Returns:
    
    The list of all the snapshots for a snapshottable directory
    
    Throws:
    
    java.io.IOException
  - gcDeletedSnapshot
```
public void gcDeletedSnapshot(java.lang.String snapshotRoot,
                              java.lang.String snapshotName)
                       throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - setCreatedRollbackImages
```
public void setCreatedRollbackImages(boolean created)
```
  - getRollingUpgradeInfo
```
public org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo getRollingUpgradeInfo()
```
  - isNeedRollbackFsImage
```
public boolean isNeedRollbackFsImage()
```
  - setNeedRollbackFsImage
```
public void setNeedRollbackFsImage(boolean needRollbackFsImage)
```
  - getRollingUpgradeStatus
```
public org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo.Bean getRollingUpgradeStatus()
```
    Description copied from interface: NameNodeMXBean
    
    Gets the RollingUpgrade information.
    
    Specified by:
    
    getRollingUpgradeStatus in interface NameNodeMXBean
    
    Returns:
    
    Rolling upgrade information if an upgrade is in progress. Else (e.g. if there is no upgrade or the upgrade is finalized), returns null.
  - isRollingUpgrade
```
public boolean isRollingUpgrade()
```
    Is rolling upgrade in progress?
  - getEffectiveLayoutVersion
```
public int getEffectiveLayoutVersion()
```
    Returns the layout version in effect. Under normal operation, this is the same as the software's current layout version, defined in NameNodeLayoutVersion.CURRENT_LAYOUT_VERSION. During a rolling upgrade, this can retain the layout version that was persisted to metadata prior to starting the rolling upgrade, back to a lower bound defined in NameNodeLayoutVersion.MINIMUM_COMPATIBLE_LAYOUT_VERSION. New fsimage files and edit log segments will continue to be written with this older layout version, so that the files are still readable by the old software version if the admin chooses to downgrade.
    
    Returns:
    
    layout version in effect
  - getECTopologyResultForPolicies
```
public org.apache.hadoop.hdfs.protocol.ECTopologyVerifierResult getECTopologyResultForPolicies(java.lang.String[] policyNames)
                                                                                        throws java.io.IOException
```
    Verifies if the given policies are supported in the given cluster setup. If not policy is specified checks for all enabled policies.
    
    Parameters:
    
    policyNames - name of policies.
    
    Returns:
    
    the result if the given policies are supported in the cluster setup
    
    Throws:
    
    java.io.IOException
  - removeXattr
```
public void removeXattr(long id,
                        java.lang.String xattrName)
                 throws java.io.IOException
```
    Description copied from interface: Namesystem
    
    Remove xAttr from the inode.
    
    Specified by:
    
    removeXattr in interface Namesystem
    
    Throws:
    
    java.io.IOException
  - checkAndProvisionSnapshotTrashRoots
```
public void checkAndProvisionSnapshotTrashRoots()
```
    Check if snapshot roots are created for all existing snapshottable directories. Create them if not. Only the active NameNode needs to execute this in HA setup once it is out of safe mode. The function gets called while exiting safe mode or post starting the services in Active NameNode, but comes into effect post whichever event happens later.
    
    Specified by:
    
    checkAndProvisionSnapshotTrashRoots in interface Namesystem
  - getTotalSyncCount
```
@Metric({"TotalSyncCount","Total number of sync operations performed on edit logs"})
public long getTotalSyncCount()
```
    Return total number of Sync Operations on FSEditLog.
    
    Specified by:
    
    getTotalSyncCount in interface FSNamesystemMBean
  - getTotalSyncTimes
```
@Metric({"TotalSyncTimes","Total time spend in sync operation on various edit logs"})
public java.lang.String getTotalSyncTimes()
```
    Return total time spent doing sync operations on FSEditLog.
    
    Specified by:
    
    getTotalSyncTimes in interface FSNamesystemMBean
  - getBytesInFuture
```
public long getBytesInFuture()
```
    Gets number of bytes in the blocks in future generation stamps.
    
    Returns:
    
    number of bytes that can be deleted if exited from safe mode.
  - getNumInMaintenanceLiveDataNodes
```
@Metric({"NumInMaintenanceLiveDataNodes","Number of live Datanodes which are in maintenance state"})
public int getNumInMaintenanceLiveDataNodes()
```
    Specified by:
    
    getNumInMaintenanceLiveDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    Number of IN_MAINTENANCE live data nodes
  - getNumInMaintenanceDeadDataNodes
```
@Metric({"NumInMaintenanceDeadDataNodes","Number of dead Datanodes which are in maintenance state"})
public int getNumInMaintenanceDeadDataNodes()
```
    Specified by:
    
    getNumInMaintenanceDeadDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    Number of IN_MAINTENANCE dead data nodes
  - getNumEnteringMaintenanceDataNodes
```
@Metric({"NumEnteringMaintenanceDataNodes","Number of Datanodes that are entering the maintenance state"})
public int getNumEnteringMaintenanceDataNodes()
```
    Specified by:
    
    getNumEnteringMaintenanceDataNodes in interface FSNamesystemMBean
    
    Returns:
    
    Number of ENTERING_MAINTENANCE data nodes
  - getVerifyECWithTopologyResult
```
public java.lang.String getVerifyECWithTopologyResult()
```
    Description copied from interface: NameNodeMXBean
    
    Verifies whether the cluster setup can support all enabled EC policies.
    
    Specified by:
    
    getVerifyECWithTopologyResult in interface NameNodeMXBean
    
    Returns:
    
    the result of the verification.
  - checkErasureCodingSupported
```
public void checkErasureCodingSupported(java.lang.String operationName)
                                 throws UnsupportedActionException
```
    Check whether operation is supported.
    
    Parameters:
    
    operationName - the name of operation.
    
    Throws:
    
    UnsupportedActionException - throws UAE if not supported.
  - setMetricsEnabled
```
public void setMetricsEnabled(boolean metricsEnabled)
```
  - isMetricsEnabled
```
@VisibleForTesting
public boolean isMetricsEnabled()
```
  - setReadLockReportingThresholdMs
```
public void setReadLockReportingThresholdMs(long readLockReportingThresholdMs)
```
  - getReadLockReportingThresholdMs
```
@VisibleForTesting
public long getReadLockReportingThresholdMs()
```
  - setWriteLockReportingThresholdMs
```
public void setWriteLockReportingThresholdMs(long writeLockReportingThresholdMs)
```
  - getWriteLockReportingThresholdMs
```
@VisibleForTesting
public long getWriteLockReportingThresholdMs()
```

Class FSNamesystem

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LOG

DFS_NAMENODE_SNAPSHOT_TRASHROOT_ENABLED

DFS_NAMENODE_SNAPSHOT_TRASHROOT_ENABLED_DEFAULT

AUDIT_LOG

Method Detail

setImageLoaded

getLazyPersistFileScrubberTS

isHaEnabled

getAuditLoggers

getRetryCache

getLeaseRecheckIntervalMs

getMaxLockHoldToReleaseLeaseMs

getMaxListOpenFilesResponses

getProvider

startSecretManagerIfNecessary

inTransitionToActive

checkOperation

getNamespaceDirs

getRequiredNamespaceEditsDirs

getNamespaceEditsDirs

getNamespaceEditsDirs

getSharedEditsDirs

readLock

readLockInterruptibly

readUnlock

readUnlock

readUnlock

writeLock

writeLockInterruptibly

writeUnlock

writeUnlock

writeUnlock

writeUnlock

hasWriteLock

hasReadLock

getReadHoldCount

getWriteHoldCount

cpLock

cpLockInterruptibly

cpUnlock

isRunning

isInStandbyState

getBlocks

getFilesBlockingDecom

getServerDefaults

isInSnapshot

getBlockCollection

getSrcPathsHash

getFSImage

getEditLog

getMissingBlocksCount

getMissingReplOneBlocksCount

getExpiredHeartbeats

getTransactionsSinceLastCheckpoint

getTransactionsSinceLastLogRoll

getLastWrittenTransactionId

getLastCheckpointTime

getCapacityTotal

getCapacityTotalGB

getCapacityUsed

getCapacityUsedGB

getCapacityRemaining

getProvidedCapacityTotal

getCapacityRemainingGB

getCapacityUsedNonDFS

getTotalLoad

getNumSnapshottableDirs

getNumSnapshots

getSnapshotStats

getNumEncryptionZones

getCurrentTokensCount

getPendingSPSPaths

getReconstructionQueuesInitProgress

getFsLockQueueLength

getNumOfReadLockLongHold