org.apache.hadoop.mapreduce.task.reduce
Class ShuffleHeader

java.lang.Object
  org.apache.hadoop.mapreduce.task.reduce.ShuffleHeader

All Implemented Interfaces:

org.apache.hadoop.io.Writable

@InterfaceAudience.Private
@InterfaceStability.Stable
public class ShuffleHeader
extends Object
implements org.apache.hadoop.io.Writable

Shuffle Header information that is sent by the TaskTracker and deciphered by the Fetcher thread of Reduce task

Constructor Summary

ShuffleHeader()

ShuffleHeader(String mapId, long compressedLength, long uncompressedLength, int forReduce)

Method Summary

void	readFields(DataInput in)
void	write(DataOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

ShuffleHeader

public ShuffleHeader()

ShuffleHeader

public ShuffleHeader(String mapId,
                     long compressedLength,
                     long uncompressedLength,
                     int forReduce)

Method Detail

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException