Package org.apache.hadoop.io.nativeio

Class NativeIO.POSIX.CacheManipulator

java.lang.Object

org.apache.hadoop.io.nativeio.NativeIO.POSIX.CacheManipulator

Direct Known Subclasses:

NativeIO.POSIX.NoMlockCacheManipulator

Enclosing class:

NativeIO.POSIX

@VisibleForTesting
public static class NativeIO.POSIX.CacheManipulator
extends java.lang.Object

Used to manipulate the operating system cache.

Constructor Summary

Constructors

Constructor	Description
CacheManipulator()

Method Summary

Modifier and Type	Method	Description
long	getMemlockLimit()
long	getOperatingSystemPageSize()
void	mlock(java.lang.String identifier, java.nio.ByteBuffer buffer, long len)
void	posixFadviseIfPossible(java.lang.String identifier, java.io.FileDescriptor fd, long offset, long len, int flags)
boolean	verifyCanMlock()

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheManipulator

public CacheManipulator()

Method Detail

mlock

public void mlock(java.lang.String identifier,
                  java.nio.ByteBuffer buffer,
                  long len)
           throws java.io.IOException

Throws:

java.io.IOException

getMemlockLimit

public long getMemlockLimit()

getOperatingSystemPageSize

public long getOperatingSystemPageSize()

posixFadviseIfPossible

public void posixFadviseIfPossible(java.lang.String identifier,
                                   java.io.FileDescriptor fd,
                                   long offset,
                                   long len,
                                   int flags)
                            throws NativeIOException

Throws:

NativeIOException

verifyCanMlock

public boolean verifyCanMlock()