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

Interface MappableBlock

All Superinterfaces:

java.lang.AutoCloseable, java.io.Closeable

All Known Implementing Classes:

MemoryMappedBlock, NativePmemMappedBlock, PmemMappedBlock

@Private
@Unstable
public interface MappableBlock
extends java.io.Closeable

Represents an HDFS block that is mapped by the DataNode.

Method Summary

Modifier and Type	Method	Description
long	getAddress()	Get cache address if applicable.
org.apache.hadoop.hdfs.ExtendedBlockId	getKey()	Get cached block's ExtendedBlockId.
long	getLength()	Get the number of bytes that have been cached.

Methods inherited from interface java.io.Closeable

close

Method Detail

getLength

long getLength()

Get the number of bytes that have been cached.

Returns:

the number of bytes that have been cached.

getAddress

long getAddress()

Get cache address if applicable. Return -1 if not applicable.

getKey

org.apache.hadoop.hdfs.ExtendedBlockId getKey()

Get cached block's ExtendedBlockId.

Returns:

cached block's ExtendedBlockId..