NullOutputFormat (Apache Hadoop Main 3.5.0 API)
Description: declaration: package: org.apache.hadoop.mapreduce.lib.output, class: NullOutputFormat

Package org.apache.hadoop.mapreduce.lib.output

# Class NullOutputFormat<K,V>

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

@Public @Stable public class NullOutputFormat<K,V> extends OutputFormat<K,V>
Consume all outputs and put them in /dev/null.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `NullOutputFormat()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `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`

- ## Constructor Details

  - ### NullOutputFormat

    public NullOutputFormat()

- ## Method Details

  - ### getRecordWriter

    public RecordWriter<K,V> getRecordWriter(TaskAttemptContext context)
    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.

  - ### checkOutputSpecs

    public void checkOutputSpecs(JobContext context)
    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.

    Implementations which write to filesystems which support delegation tokens usually collect the tokens for the destination path(s) and attach them to the job context's JobConf.
    Specified by:
      `checkOutputSpecs` in class `OutputFormat<K,V>`
    Parameters:
      `context` - information about the job

  - ### getOutputCommitter

    public OutputCommitter getOutputCommitter(TaskAttemptContext context)
    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