org.apache.hadoop.hbase.mapred
Class TableOutputFormat

java.lang.Object
  extended by org.apache.hadoop.mapred.OutputFormatBase
      extended by org.apache.hadoop.hbase.mapred.TableOutputFormat
All Implemented Interfaces:
OutputFormat

public class TableOutputFormat
extends OutputFormatBase

Convert Map/Reduce output and write it to an HBase table


Nested Class Summary
protected  class TableOutputFormat.TableRecordWriter
          Convert Reduce output (key, value) to (HStoreKey, KeyedDataArrayWritable) and write to an HBase table
 
Field Summary
static String OUTPUT_TABLE
          JobConf parameter that specifies the output table
 
Constructor Summary
TableOutputFormat()
          constructor
 
Method Summary
 void checkOutputSpecs(FileSystem ignored, JobConf job)
          Check whether the output specification for a job is appropriate.
 RecordWriter getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress)
          Construct a RecordWriter with Progressable.
 
Methods inherited from class org.apache.hadoop.mapred.OutputFormatBase
getCompressOutput, getOutputCompressorClass, setCompressOutput, setOutputCompressorClass
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

OUTPUT_TABLE

public static final String OUTPUT_TABLE
JobConf parameter that specifies the output table

See Also:
Constant Field Values
Constructor Detail

TableOutputFormat

public TableOutputFormat()
constructor

Method Detail

getRecordWriter

public RecordWriter getRecordWriter(FileSystem ignored,
                                    JobConf job,
                                    String name,
                                    Progressable progress)
                             throws IOException
Description copied from interface: OutputFormat
Construct a RecordWriter with Progressable.

Specified by:
getRecordWriter in interface OutputFormat
Specified by:
getRecordWriter in class OutputFormatBase
job - 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
Throws:
IOException

checkOutputSpecs

public void checkOutputSpecs(FileSystem ignored,
                             JobConf job)
                      throws FileAlreadyExistsException,
                             InvalidJobConfException,
                             IOException
Description copied from interface: OutputFormat
Check whether the output specification for a job is appropriate. Called when 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 interface OutputFormat
Overrides:
checkOutputSpecs in class OutputFormatBase
job - the job whose output will be written
Throws:
IOException - when output should not be attempted
FileAlreadyExistsException
InvalidJobConfException


Copyright © 2006 The Apache Software Foundation