LazyOutputFormat (Hadoop 0.20.2-cdh3u4 API)
Date: 2012-05-07

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

    java.lang.Object
      org.apache.hadoop.mapreduce.OutputFormat<K,V>
          org.apache.hadoop.mapreduce.lib.output.FilterOutputFormat<K,V>
              org.apache.hadoop.mapreduce.lib.output.LazyOutputFormat<K,V>

    public class LazyOutputFormat<K,V>

extends FilterOutputFormat<K,V>

A Convenience class that creates output lazily.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.lib.output.FilterOutputFormat
`FilterOutputFormat.FilterRecordWriter<K,V>`

Field Summary
`static String` | `OUTPUT_FORMAT`

Fields inherited from class org.apache.hadoop.mapreduce.lib.output.FilterOutputFormat
`baseOut`

Constructor Summary
`LazyOutputFormat()`

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.
`static void` | `setOutputFormatClass(Job job, Class<? extends OutputFormat> theClass)` Set the underlying output format for LazyOutputFormat.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### OUTPUT_FORMAT

    public static String OUTPUT_FORMAT

Constructor Detail

### LazyOutputFormat

    public LazyOutputFormat()

Method Detail

### setOutputFormatClass

    public static void setOutputFormatClass(Job job,
                                            Class<? extends OutputFormat> theClass)

  Set the underlying output format for LazyOutputFormat.

  Parameters:
    `job` - the `Job` to modify
    `theClass` - the underlying class

### getRecordWriter

    public RecordWriter<K,V> getRecordWriter(TaskAttemptContext context)
                                      throws IOException,
                                             InterruptedException

  Description copied from class: `OutputFormat`
  Get the `RecordWriter` for the given task.

  Overrides:
    `getRecordWriter` in class `FilterOutputFormat<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.

  Overrides:
    `checkOutputSpecs` in class `FilterOutputFormat<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.

  Overrides:
    `getOutputCommitter` in class `FilterOutputFormat<K,V>`
  Parameters:
    `context` - the task context
  Returns:
    an output committer
  Throws:
    `IOException`
    `InterruptedException`

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