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

Class ReplicaOutputStreams

java.lang.Object

org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaOutputStreams

All Implemented Interfaces:

Closeable, AutoCloseable

public class ReplicaOutputStreams
extends Object
implements Closeable

Contains the output streams for the data and checksum of a replica.

Field Summary

Fields

Modifier and Type	Field	Description
static final org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor	Description
ReplicaOutputStreams(OutputStream dataOut, OutputStream checksumOut, org.apache.hadoop.util.DataChecksum checksum, FsVolumeSpi volume, FileIoProvider fileIoProvider)	Create an object with a data output stream, a checksum output stream and a checksum.

Method Summary

Modifier and Type	Method	Description
void	close()
void	closeDataStream()
void	dropCacheBehindWrites(String identifier, long offset, long len, int flags)
void	flushChecksumOut()	Flush the checksum stream if it supports it.
void	flushDataOut()	Flush the data stream if it supports it.
org.apache.hadoop.util.DataChecksum	getChecksum()
OutputStream	getChecksumOut()
OutputStream	getDataOut()
FileDescriptor	getOutFd()
boolean	isTransientStorage()
void	syncChecksumOut()	Sync the checksum stream if it supports it.
void	syncDataOut()	Sync the data stream if it supports it.
void	syncFileRangeIfPossible(long offset, long nbytes, int flags)
void	writeDataToDisk(byte[] b, int off, int len)

Methods inherited from class java.lang.Object

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

Field Details

LOG

public static final org.slf4j.Logger LOG

Constructor Details

ReplicaOutputStreams

public ReplicaOutputStreams(OutputStream dataOut,
 OutputStream checksumOut,
 org.apache.hadoop.util.DataChecksum checksum,
 FsVolumeSpi volume,
 FileIoProvider fileIoProvider)

Create an object with a data output stream, a checksum output stream and a checksum.

Method Details

getOutFd

public FileDescriptor getOutFd()

getDataOut

public OutputStream getDataOut()

Returns:

the data output stream.

getChecksumOut

public OutputStream getChecksumOut()

Returns:

the checksum output stream.

getChecksum

public org.apache.hadoop.util.DataChecksum getChecksum()

Returns:

the checksum.

isTransientStorage

public boolean isTransientStorage()

Returns:

is writing to a transient storage?

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

closeDataStream

public void closeDataStream()
                     throws IOException

Throws:

IOException

syncDataOut

public void syncDataOut()
                 throws IOException

Sync the data stream if it supports it.

Throws:

IOException

syncChecksumOut

public void syncChecksumOut()
                     throws IOException

Sync the checksum stream if it supports it.

Throws:

IOException

flushDataOut

public void flushDataOut()
                  throws IOException

Flush the data stream if it supports it.

Throws:

IOException

flushChecksumOut

public void flushChecksumOut()
                      throws IOException

Flush the checksum stream if it supports it.

Throws:

IOException

writeDataToDisk

public void writeDataToDisk(byte[] b,
 int off,
 int len)
                     throws IOException

Throws:

IOException

syncFileRangeIfPossible

public void syncFileRangeIfPossible(long offset,
 long nbytes,
 int flags)
                             throws org.apache.hadoop.io.nativeio.NativeIOException

Throws:

org.apache.hadoop.io.nativeio.NativeIOException

dropCacheBehindWrites

public void dropCacheBehindWrites(String identifier,
 long offset,
 long len,
 int flags)
                           throws org.apache.hadoop.io.nativeio.NativeIOException

Throws:

org.apache.hadoop.io.nativeio.NativeIOException