Interface | Description |
---|---|
DataNodeMXBean |
This is the JMX management interface for data node information
|
Replica |
This represents block replicas which are stored in DataNode.
|
ReplicaInPipelineInterface |
This defines the interface of a replica in Pipeline that's being written to
|
Class | Description |
---|---|
BlockMetadataHeader |
BlockMetadataHeader manages metadata for data blocks on Datanodes.
|
BlockPoolSliceStorage |
Manages storage for the set of BlockPoolSlices which share a particular
block pool id, on this DataNode.
|
CachingStrategy |
The caching strategy we should use for an HDFS read or write operation.
|
DataBlockScanner |
DataBlockScanner manages block scanning for all the block pools.
|
DataBlockScanner.Servlet | |
DataNode |
DataNode is a class (and program) that stores a set of
blocks for a DFS deployment.
|
DatanodeJspHelper | |
DatanodeUtil |
Provide utility methods for Datanode.
|
DataStorage |
Data storage information file.
|
DirectoryScanner |
Periodically scans the data directories for block and block metadata files.
|
DNConf |
Simple class encapsulating all of the configuration that the DataNode
loads at startup time.
|
FinalizedReplica |
This class describes a replica that has been finalized.
|
ReplicaBeingWritten |
This class represents replicas being written.
|
ReplicaInfo |
This class is used by datanodes to maintain meta data of its replicas.
|
ReplicaInfo.ReplicaDirInfo | |
ReplicaInPipeline |
This class defines a replica in a pipeline, which
includes a persistent replica being written to by a dfs client or
a temporary replica being replicated by a source datanode or
being copied for the balancing purpose.
|
ReplicaUnderRecovery |
This class represents replicas that are under block recovery
It has a recovery id that is equal to the generation stamp
that the replica will be bumped to after recovery
The recovery id is used to handle multiple concurrent block recoveries.
|
ReplicaWaitingToBeRecovered |
This class represents a replica that is waiting to be recovered.
|
SecureDataNodeStarter |
Utility class to start a datanode in a secure cluster, first obtaining
privileged resources before main startup and handing them to the datanode.
|
SecureDataNodeStarter.SecureResources |
Stash necessary resources needed for datanode operation in a secure env.
|
Exception | Description |
---|---|
DataNode.ShortCircuitFdsUnsupportedException | |
DataNode.ShortCircuitFdsVersionException | |
ReplicaAlreadyExistsException |
Exception indicating that the target block already exists
and is not set to be recovered/overwritten.
|
ReplicaNotFoundException |
Exception indicating that DataNode does not have a replica
that matches the target block.
|
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