org.apache.hadoop.mapreduce.lib.output
Class FilterOutputFormat<K,V>

java.lang.Object
  extended by org.apache.hadoop.mapreduce.OutputFormat<K,V>
      extended by org.apache.hadoop.mapreduce.lib.output.FilterOutputFormat<K,V>
Direct Known Subclasses:
LazyOutputFormat

@InterfaceAudience.Public
@InterfaceStability.Stable
public class FilterOutputFormat<K,V>
extends OutputFormat<K,V>

FilterOutputFormat is a convenience class that wraps OutputFormat.


Field Summary
protected  OutputFormat<K,V> baseOut
           
 
Constructor Summary
FilterOutputFormat()
           
FilterOutputFormat(OutputFormat<K,V> baseOut)
          Create a FilterOutputFormat based on the underlying output format.
 
Method Summary
 void checkOutputSpecs(JobContext context)
          Check for validity of the output-specification for the job.
 OutputCommitter getOutputCommitter(TaskAttemptContext context)
          Get the output committer for this output format.
 RecordWriter<K,V> getRecordWriter(TaskAttemptContext context)
          Get the RecordWriter for the given task.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

baseOut

protected OutputFormat<K,V> baseOut
Constructor Detail

FilterOutputFormat

public FilterOutputFormat()

FilterOutputFormat

public FilterOutputFormat(OutputFormat<K,V> baseOut)
Create a FilterOutputFormat based on the underlying output format.

Parameters:
baseOut - the underlying OutputFormat
Method Detail

getRecordWriter

public RecordWriter<K,V> getRecordWriter(TaskAttemptContext context)
                                  throws IOException,
                                         InterruptedException
Description copied from class: OutputFormat
Get the RecordWriter for the given task.

Specified by:
getRecordWriter in class OutputFormat<K,V>
Parameters:
context - the information about the current task.
Returns:
a RecordWriter to write the output for the job.
Throws:
IOException
InterruptedException

checkOutputSpecs

public void checkOutputSpecs(JobContext context)
                      throws IOException,
                             InterruptedException
Description copied from class: OutputFormat
Check for validity of the output-specification for the job.

This is to validate the output specification for the job when it is a job is submitted. Typically checks that it does not already exist, throwing an exception when it already exists, so that output is not overwritten.

Specified by:
checkOutputSpecs in class OutputFormat<K,V>
Parameters:
context - information about the job
Throws:
IOException - when output should not be attempted
InterruptedException

getOutputCommitter

public OutputCommitter getOutputCommitter(TaskAttemptContext context)
                                   throws IOException,
                                          InterruptedException
Description copied from class: OutputFormat
Get the output committer for this output format. This is responsible for ensuring the output is committed correctly.

Specified by:
getOutputCommitter in class OutputFormat<K,V>
Parameters:
context - the task context
Returns:
an output committer
Throws:
IOException
InterruptedException


Copyright © 2012 Apache Software Foundation. All Rights Reserved.