Package org.apache.hadoop.hdfs.server.blockmanagement

Interface Summary

Interface	Description
BlockStatsMXBean	This is an interface used to retrieve statistic information related to block management.
DatanodeAdminMonitorInterface	Interface used to implement a decommission and maintenance monitor class, which is instantiated by the DatanodeAdminManager class.
DatanodeStatistics	Datanode statistics

Class Summary

Class	Description
AvailableSpaceBlockPlacementPolicy	Space balanced block placement policy.
AvailableSpaceRackFaultTolerantBlockPlacementPolicy	Space balanced rack fault tolerant block placement policy.
BlockIdManager	BlockIdManager allocates the generation stamps and the block ID.
BlockInfoStriped.StorageAndBlockIndex	This class contains datanode storage information and block index in the block group.
BlockManagerFaultInjector	Used to inject certain faults for testing.
BlockPlacementPolicyWithNodeGroup	The class is responsible for choosing the desired number of targets for placing block replicas on environment with node-group layer.
BlockPlacementStatusDefault
BlockStoragePolicySuite	A collection of block storage policies.
BlockUnderConstructionFeature	Represents the under construction feature of a Block.
CombinedHostFileManager	This class manages datanode configuration using a json file.
DatanodeAdminBackoffMonitor	This class implements the logic to track decommissioning and entering maintenance nodes, ensure all their blocks are adequately replicated before they are moved to the decommissioned or maintenance state.
DatanodeAdminDefaultMonitor	Checks to see if datanodes have finished DECOMMISSION_INPROGRESS or ENTERING_MAINTENANCE state.
DatanodeAdminMonitorBase	This abstract class provides some base methods which are inherited by the DatanodeAdmin BackOff and Default Monitors, which control decommission and maintenance mode.
DatanodeDescriptor.CachedBlocksList	A list of CachedBlock objects on this datanode.
DatanodeStorageInfo	A Datanode has one or more storages.
HostFileManager	This class manages the include and exclude files for HDFS.
HostSet	The HostSet allows efficient queries on matching wildcard addresses.
NumberReplicas	A immutable object that stores the number of live replicas and the number of decommissioned Replicas.
ProvidedStorageMap.ProvidedDescriptor	An abstract DatanodeDescriptor to track datanodes with provided storages.
SlowDiskTracker.DiskLatency	This structure is a thin wrapper over disk latencies.
SlowPeerTracker.ReportForJson	This structure is a thin wrapper over reports to make Json [de]serialization easy.

Enum Summary

Enum	Description
CorruptReplicasMap.Reason	The corruption reason code
DatanodeDescriptor.CachedBlocksList.Type
NumberReplicas.StoredReplicaState

Exception Summary

Exception	Description
UnresolvedTopologyException	This exception is thrown if resolving topology path for a node fails.