# Hierarchy For Package org.apache.hadoop.hdfs.server.datanode

Package Hierarchies:

- All Packages

## Class Hierarchy

- java.lang.Object
  - org.apache.hadoop.hdfs.protocol.Block (implements java.lang.Comparable<T>, org.apache.hadoop.io.Writable)
    - org.apache.hadoop.hdfs.server.datanode.ReplicaInfo (implements org.apache.hadoop.util.LightWeightGSet.LinkedElement, org.apache.hadoop.hdfs.server.datanode.Replica)
      - org.apache.hadoop.hdfs.server.datanode.LocalReplica
        - org.apache.hadoop.hdfs.server.datanode.FinalizedReplica
        - org.apache.hadoop.hdfs.server.datanode.LocalReplicaInPipeline (implements org.apache.hadoop.hdfs.server.datanode.ReplicaInPipeline)
          - org.apache.hadoop.hdfs.server.datanode.ReplicaBeingWritten
        - org.apache.hadoop.hdfs.server.datanode.ReplicaUnderRecovery
        - org.apache.hadoop.hdfs.server.datanode.ReplicaWaitingToBeRecovered
  - org.apache.hadoop.hdfs.server.datanode.BlockRecoveryWorker.RecoveryTaskStriped
  - org.apache.hadoop.hdfs.server.datanode.ChunkChecksum
  - org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.ReportCompiler (implements java.util.concurrent.Callable<V>)
  - org.apache.hadoop.hdfs.server.datanode.DiskBalancer.DiskBalancerMover (implements org.apache.hadoop.hdfs.server.datanode.DiskBalancer.BlockMover)
  - org.apache.hadoop.hdfs.server.datanode.DiskBalancer.VolumePair
  - org.apache.hadoop.hdfs.server.datanode.ErrorReportAction (implements org.apache.hadoop.hdfs.server.datanode.BPServiceActorAction)
  - org.apache.hadoop.fs.GetSpaceUsed.Builder
    - org.apache.hadoop.hdfs.server.datanode.FSCachingGetSpaceUsed.Builder
  - org.apache.hadoop.hdfs.server.datanode.LocalReplica.ReplicaDirInfo
  - org.apache.hadoop.hdfs.server.datanode.ReplicaBuilder
  - org.apache.hadoop.hdfs.server.datanode.ReplicaHandler (implements java.io.Closeable)
  - org.apache.hadoop.hdfs.server.datanode.ReportBadBlockAction (implements org.apache.hadoop.hdfs.server.datanode.BPServiceActorAction)
  - org.apache.hadoop.hdfs.server.datanode.SecureDataNodeStarter (implements org.apache.commons.daemon.Daemon)
  - org.apache.hadoop.hdfs.server.datanode.SecureDataNodeStarter.SecureResources
  - org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry
  - org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.NewShmInfo (implements java.io.Closeable)
  - org.apache.hadoop.hdfs.shortcircuit.ShortCircuitShm
    - org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.RegisteredShm (implements org.apache.hadoop.net.unix.DomainSocketWatcher.Handler)
  - org.apache.hadoop.hdfs.server.datanode.StorageLocation.CheckContext
  - java.lang.Thread (implements java.lang.Runnable)
    - org.apache.hadoop.hdfs.server.datanode.VolumeScanner
  - java.lang.Throwable (implements java.io.Serializable)
    - java.lang.Exception
      - java.io.IOException
        - org.apache.hadoop.hdfs.server.datanode.BPServiceActorActionException
        - org.apache.hadoop.hdfs.server.datanode.DiskFileCorruptException
        - org.apache.hadoop.hdfs.server.datanode.ReplicaAlreadyExistsException
        - org.apache.hadoop.hdfs.server.datanode.UnexpectedReplicaStateException

## Interface Hierarchy

- org.apache.hadoop.hdfs.server.datanode.BPServiceActorAction
- org.apache.hadoop.hdfs.server.datanode.DiskBalancer.BlockMover
- org.apache.hadoop.hdfs.server.datanode.Replica
  - org.apache.hadoop.hdfs.server.datanode.ReplicaInPipeline
- org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.Visitor

## Enum Hierarchy

- java.lang.Object
  - java.lang.Enum<E> (implements java.lang.Comparable<T>, java.io.Serializable)
    - org.apache.hadoop.hdfs.server.datanode.DataNodeLayoutVersion.Feature (implements org.apache.hadoop.hdfs.protocol.LayoutVersion.LayoutFeature)
    - org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.BlockDirFilter (implements java.io.FilenameFilter)
    - org.apache.hadoop.hdfs.server.datanode.FileIoProvider.OPERATION

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