Package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl

Interface Summary

Interface	Description
MappableBlock	Represents an HDFS block that is mapped by the DataNode.

Class Summary

Class	Description
BlockPoolSlice	A block pool slice represents a portion of a block pool stored on a volume.
FsDatasetCache	Manages caching for an FsDatasetImpl by using the mmap(2) and mlock(2) system calls to lock blocks into memory.
FsDatasetFactory	A factory for creating FsDatasetImpl objects.
FsDatasetUtil	Utility methods.
FsVolumeImpl	The underlying volume used to store replica.
FsVolumeImplBuilder	This class is to be used as a builder for FsVolumeImpl objects.
MappableBlockLoader	Maps block to DataNode cache region.
MappableBlockLoaderFactory	Creates MappableBlockLoader.
MemoryMappableBlockLoader	Maps block to memory.
MemoryMappedBlock	Represents an HDFS block that is mapped to memory by the DataNode.
MountVolumeMap	MountVolumeMap contains information of the relationship between underlying filesystem mount and datanode volumes.
NativePmemMappableBlockLoader	Map block to persistent memory with native PMDK libs.
NativePmemMappedBlock	Represents an HDFS block that is mapped to persistent memory by the DataNode.
PmemMappableBlockLoader	Maps block to persistent memory by using mapped byte buffer.
PmemMappedBlock	Represents an HDFS block that is mapped to persistent memory by DataNode with mapped byte buffer.
PmemVolumeManager	Manage the persistent memory volumes.
RamDiskReplicaLruTracker	An implementation of RamDiskReplicaTracker that uses an LRU eviction scheme.
RamDiskReplicaTracker
ReplicaCachingGetSpaceUsed	Fast and accurate class to tell how much space HDFS is using.
ReservedSpaceCalculator	Used for calculating file system space reserved for non-HDFS data.
ReservedSpaceCalculator.Builder	Used for creating instances of ReservedSpaceCalculator.
ReservedSpaceCalculator.ReservedSpaceCalculatorAbsolute	Based on absolute number of reserved bytes.
ReservedSpaceCalculator.ReservedSpaceCalculatorAggressive	Calculates absolute and percentage based reserved space and picks the one that will yield less reserved space.
ReservedSpaceCalculator.ReservedSpaceCalculatorConservative	Calculates absolute and percentage based reserved space and picks the one that will yield more reserved space.
ReservedSpaceCalculator.ReservedSpaceCalculatorPercentage	Based on percentage of total capacity in the storage.

Enum Summary

Enum	Description
FsVolumeImpl.BlockDirFilter	Filter for block file names stored on the file system volumes.

Exception Summary

Exception	Description
AddBlockPoolException	This exception collects all IOExceptions thrown when adding block pools and scanning volumes.