org.apache.hadoop.mapred
Class MapFileOutputFormat

java.lang.Object
  extended by org.apache.hadoop.mapred.FileOutputFormat<WritableComparable,Writable>
      extended by org.apache.hadoop.mapred.MapFileOutputFormat
All Implemented Interfaces:
OutputFormat<WritableComparable,Writable>

@InterfaceAudience.Public
@InterfaceStability.Stable
public class MapFileOutputFormat
extends FileOutputFormat<WritableComparable,Writable>

An OutputFormat that writes MapFiles.


Constructor Summary
MapFileOutputFormat()
           
 
Method Summary
static
<K extends WritableComparable,V extends Writable>
Writable
getEntry(org.apache.hadoop.io.MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value)
          Get an entry from output generated by this class.
static org.apache.hadoop.io.MapFile.Reader[] getReaders(FileSystem ignored, Path dir, Configuration conf)
          Open the output generated by this format.
 RecordWriter<WritableComparable,Writable> getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress)
          Get the RecordWriter for the given job.
 
Methods inherited from class org.apache.hadoop.mapred.FileOutputFormat
checkOutputSpecs, getCompressOutput, getOutputCompressorClass, getOutputPath, getPathForCustomFile, getTaskOutputPath, getUniqueName, getWorkOutputPath, setCompressOutput, setOutputCompressorClass, setOutputPath
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MapFileOutputFormat

public MapFileOutputFormat()
Method Detail

getRecordWriter

public RecordWriter<WritableComparable,Writable> getRecordWriter(FileSystem ignored,
                                                                 JobConf job,
                                                                 String name,
                                                                 Progressable progress)
                                                          throws IOException
Description copied from interface: OutputFormat
Get the RecordWriter for the given job.

Specified by:
getRecordWriter in interface OutputFormat<WritableComparable,Writable>
Specified by:
getRecordWriter in class FileOutputFormat<WritableComparable,Writable>
job - configuration for the job whose output is being written.
name - the unique name for this part of the output.
progress - mechanism for reporting progress while writing to file.
Returns:
a RecordWriter to write the output for the job.
Throws:
IOException

getReaders

public static org.apache.hadoop.io.MapFile.Reader[] getReaders(FileSystem ignored,
                                                               Path dir,
                                                               Configuration conf)
                                                        throws IOException
Open the output generated by this format.

Throws:
IOException

getEntry

public static <K extends WritableComparable,V extends Writable> Writable getEntry(org.apache.hadoop.io.MapFile.Reader[] readers,
                                                                                  Partitioner<K,V> partitioner,
                                                                                  K key,
                                                                                  V value)
                         throws IOException
Get an entry from output generated by this class.

Throws:
IOException


Copyright © 2012 Apache Software Foundation. All Rights Reserved.