org.apache.hadoop.hbase.io.hfile.bucket

Class ExclusiveMemoryMmapIOEngine

java.lang.Object

org.apache.hadoop.hbase.io.hfile.bucket.FileMmapIOEngine

org.apache.hadoop.hbase.io.hfile.bucket.ExclusiveMemoryMmapIOEngine

All Implemented Interfaces:

IOEngine

@InterfaceAudience.Private
public class ExclusiveMemoryMmapIOEngine
extends FileMmapIOEngine

IO engine that stores data to a file on the local block device using memory mapping mechanism

Field Summary

Fields inherited from class org.apache.hadoop.hbase.io.hfile.bucket.FileMmapIOEngine

bufferArray, path, size

Constructor Summary

Constructors

Constructor and Description
ExclusiveMemoryMmapIOEngine(String filePath, long capacity)

Method Summary

Modifier and Type	Method and Description
Cacheable	read(long offset, int length, CacheableDeserializer<Cacheable> deserializer) Transfers data from IOEngine to a Cacheable object.

Methods inherited from class org.apache.hadoop.hbase.io.hfile.bucket.FileMmapIOEngine

isPersistent, shutdown, sync, toString, write, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.hadoop.hbase.io.hfile.bucket.IOEngine

usesSharedMemory

Constructor Detail

ExclusiveMemoryMmapIOEngine

public ExclusiveMemoryMmapIOEngine(String filePath,
                                   long capacity)
                            throws IOException

Throws:

IOException

Method Detail

read

public Cacheable read(long offset,
                      int length,
                      CacheableDeserializer<Cacheable> deserializer)
               throws IOException

Description copied from interface: IOEngine

Transfers data from IOEngine to a Cacheable object.

Specified by:

read in interface IOEngine

Specified by:

read in class FileMmapIOEngine

Parameters:

offset - The offset in the IO engine where the first byte to be read

length - How many bytes to be read from the offset

deserializer - The deserializer to be used to make a Cacheable from the data.

Returns:

Cacheable

Throws:

IOException