All Classes

Access time parameter.

Access tokens generally expire.

AclPermission parameter.

A response of add an ErasureCoding policy.

The exception that happens when you ask to create a file that already is being created, but is not closed yet.

A struct-like class for holding partial listings returned by the batched listing API.

Encapsulates various options related to how fine-grained data checksums are combined into block-level checksums.

Block Construction Stage

BlockMetadataHeader manages metadata for data blocks on Datanodes.

Indicates a failure due to block pinning.

Utility class to create BlockReader implementations.

This class maintains a metric of rolling average latency for short circuit reads.

Options that can be specified when manually triggering a block report.

Block size parameter.

Type of a block.

Manage byte array creation and release.

OutputStream that writes into a ByteBuffer.

This class wraps a URL and provides method to open connection.

Describes a path-based cache directive.

Denotes a relative or absolute expiration time for a CacheDirective.

Describes a path-based cache directive.

Specifies semantics for CacheDirective operations.

CachePoolInfo describes a cache pool.

CachePoolStats describes cache pool statistics.

The caching strategy we should use for an HDFS read or write operation.

This exception is thrown when the length of a LocatedBlock instance can not be obtained.

An client-datanode protocol for block recovery

This class is the client side translator to translate the requests made on ClientDatanodeProtocol interfaces to the RPC server implementing ClientDatanodeProtocolPB.

ClientProtocol is used by user code via the DistributedFileSystem class to communicate with the NameNode.

Writer support for JSON-based datanode configuration, an alternative format to the exclude/include files configuration.

Obtain an access token via a a credential (provided through the Configuration) using the Client Credentials Grant workflow.

Supply a access token obtained via a refresh token (provided through the Configuration using the second half of the Authorization Code Grant workflow.

Contains a list of paths corresponding to corrupt files and a cookie used for iterative calls to NameNode.listCorruptFileBlocks.

CreateEncryptionZoneFlag is used in HdfsAdmin.createEncryptionZone(Path, String, EnumSet) to indicate what should be done when creating an encryption zone.

Create Parent parameter.

A little struct class to contain all fields required to perform encryption of the DataTransferProtocol.

The class describes the configured admin properties for a datanode.

This class extends the primary identifier of a Datanode with ephemeral state, eg usage information, current administrative state, and the network location that is communicated to clients.

Building the DataNodeInfo.

Locally available datanode information

The state of the storage.

A class that allows DataNode to communicate information about usage statistics/metrics to NameNode.

This class is helper class to generate a live usage report by calculating the delta between current DataNode usage metrics and the usage metrics captured at the time of the last report.

Transfer data to/from datanode using a streaming protocol.

Utility methods implementing SASL negotiation for DataTransferProtocol.

Represents delegation token used for authentication.

A delegation token that is specialized for HDFS

Delete operations.

DFSClient can connect to a Hadoop Filesystem and perform basic file tasks.

Configuration for short-circuit reads.

DfsClientShm is a subclass of ShortCircuitShm which is used by the DfsClient.

The client-side metrics for hedged read feature.

DFSInputStream provides bytes from a named file.

This is for counting distributed file system operations.

DFSPacket is used by DataStreamer and DFSOutputStream.

DFSStripedInputStream reads from striped block groups.

This class defines a partial listing of a directory to support iterative directory listing.

Helper class that reports how much work has has been done by the node.

Various result values.

HdfsDataOutputStreamBuilder provides the HDFS-specific capabilities to write file on HDFS.

Represents a peer that we communicate with by using blocking I/O on a UNIX domain socket.

A EC policy loading tool that loads user defined EC policies from XML file.

Result of the verification whether the current cluster setup can support all enabled EC policies.

A simple class for representing an encryption zone.

A policy about how to write/read/code an erasure coding file.

Value denotes the possible states of an ErasureCodingPolicy.

Sent when an existing file is opened for append.

Sent when a file is closed after append or create.

Sent when a file, directory, or symlink is renamed.

Sent when a file is truncated.

Contains a list of event batches, the transaction ID in the edit log up to which we read to produce these events, and the first txid we observed when producing these events (the last of which is for the purpose of determining whether we have missed events due to edit deletion).

Identifies a Block uniquely across the block pools

An ExternalBlockReader uses pluggable ReplicaAccessor objects to read from replicas.

Get operations.

This interface aims to decouple the proxy creation implementation that used in AbstractNNFailoverProxyProvider.

Wrapper for BlockLocation that also includes a LocatedBlock, allowing more detailed queries to the datanode about a block.

dfs.client.block.write configuration properties

These are deprecated config keys to client code.

dfs.client.hedged.read configuration properties

dfs.client.mmap configuration properties

dfs.client.short.circuit configuration properties

dfs.client.write configuration properties

Adds deprecated keys into the configuration.

This enum wraps above Storage Policy ID and name.

Upgrade actions.

The Hdfs implementation of FSDataOutputStream.

HDFS metadata for an entity in the filesystem.

Set of features potentially active on an instance.

HDFS metadata for an entity in the filesystem with locations.

A partial listing returned by the batched listing API.

The public utility API for HDFS.

Http operation interface.

Http operation types

Access token verification failed.

A little struct class to wrap an InputStream and an OutputStream.

A NNFailoverProxyProvider implementation which works on IP failover setup.

Use UserGroupInformation as a fallback authenticator if the server does not use Kerberos SPNEGO HTTP authentication.

Class to contain Lastblock and HdfsFileStatus for the Append operation

Length parameter.

Collection of blocks with their locations and the file length.

LocatedBlock with striped block support.

Modification time parameter.

Wrapper for a client proxy as well as its associated service ID.

NewLength parameter.

Thrown when no EC policy is set explicitly on the directory.

The file has not finished being written to enough datanodes yet.

Configure a connection to use OAuth2 authentication.

A FailoverProxyProvider implementation that supports reading from observer namenode(s).

Offset parameter.

Operation

OpenFilesIterator is a remote iterator that iterates over the open files list managed by the NameNode.

Outlier detection metrics - median, median absolute deviation, upper latency limit, actual latency etc.

Owner parameter.

Class to handle reading packets one-at-a-time from the wire.

Utilities for converting protobuf classes to and from hdfs-client side implementation classes and other helper utilities to help in dealing with protobuf.

A cache of input stream sockets to Data Node.

Pipeline Acknowledgment

Post operations.

Http POST operation parameter.

Marker interface used to annotate methods that are readonly.

ReconfigurationProtocol is used by HDFS admin to reload configuration for NN/DN without restarting them.

This class is the client side translator to translate the requests made on ReconfigurationProtocol interfaces to the RPC server implementing ReconfigurationProtocolPB.

Recursive parameter.

ReencryptionStatusIterator is a remote iterator that iterates over the reencryption status of encryption zones.

Rename option set parameter.

The setting of replace-datanode-on-failure feature.

The public API for ReplicaAccessor objects.

Exception indicating that DataNode does not have a replica that matches the target block.

Replication parameter.

A FailoverProxyProvider implementation to support automatic msync-ing when using routers.

This exception is thrown when the name node is in safe mode.

The ShortCircuitCache tracks things which the client needs to access HDFS block files via short-circuit.

Identifies a DfsClientShm.

A class that allows a DataNode to communicate information about all its disks that appear to be slow.

A class that allows a DataNode to communicate information about all its peer DataNodes that appear to be slow.

resuming index of snapshotDiffReportListing operation.

Representing the full path and diff type of a file/directory where changes have happened.

Types of the difference, which include CREATE, MODIFY, DELETE, and RENAME.

This class represents to the difference between two snapshots of the same directory, or the difference between a snapshot of the directory and its current state.

The snapshot startPath parameter used by snapshotDiffReportListing.

Metadata about a snapshottable directory.

Used during batched ListStatus operations.

Utilization report for a Datanode storage

storage type parameter.

When accessing a file in striped layout, operations on logical byte ranges in the file need to be mapped to physical byte ranges on block files stored on DataNodes.

Struct holding the read statistics.

Used to indicate the buffered data's range in the block group.

Indicates the coverage of an StripedBlockUtil.AlignedStripe on an internal block, and the state of the chunk in the context of the read request.

A simple utility class representing an arbitrary vertical inclusive range starting at StripedBlockUtil.VerticalRange.offsetInBlock and lasting for StripedBlockUtil.VerticalRange.spanInBlock bytes in an internal block.

AbstractFileSystem implementation for HDFS over the web (secure).

The set of built-in erasure coding policies.

Class used to indicate whether a channel is trusted or not.

Thrown when a symbolic link is encountered in a path.

User parameter.

AbstractFileSystem implementation for HDFS over the web.

A FileSystem for HDFS over the web.

XAttr is the POSIX Extended Attribute model similar to that found in traditional Operating Systems.

The exception that happens when you ask to get a non existing XAttr.

Builder of ZoneReencryptionStatus.