Package org.apache.hadoop.hdfs.util

Class AtomicFileOutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

org.apache.hadoop.hdfs.util.AtomicFileOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

public class AtomicFileOutputStream
extends FilterOutputStream

A FileOutputStream that has the property that it will only show up at its destination once it has been entirely written and flushed to disk. While being written, it will use a .tmp suffix. When the output stream is closed, it is flushed, fsynced, and will be moved into place, overwriting any file that already exists at that location. NOTE: on Windows platforms, it will not atomically replace the target file - instead the target file is deleted before this one is moved into place.

Field Summary

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

Constructors

Constructor	Description
AtomicFileOutputStream(File f)

Method Summary

Modifier and Type	Method	Description
void	abort()	Close the atomic file, but do not "commit" the temporary file on top of the destination.
void	close()

Methods inherited from class java.io.FilterOutputStream

flush, write, write, write

Methods inherited from class java.io.OutputStream

nullOutputStream

Methods inherited from class java.lang.Object

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

Constructor Details

AtomicFileOutputStream

public AtomicFileOutputStream(File f)
                       throws FileNotFoundException

Throws:

FileNotFoundException

Method Details

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class FilterOutputStream

Throws:

IOException

abort

public void abort()

Close the atomic file, but do not "commit" the temporary file on top of the destination. This should be used if there is a failure in writing.