org.apache.hadoop.hbase.mapreduce

Class WALPlayer

java.lang.Object

Configured

org.apache.hadoop.hbase.mapreduce.WALPlayer

Direct Known Subclasses:

IntegrationTestLoadAndVerify.WALSearcher

@InterfaceAudience.Public
 @InterfaceStability.Stable
public class WALPlayer
extends Configured

A tool to replay WAL files as a M/R job. The WAL can be replayed for a set of tables or all tables, and a timerange can be provided (in milliseconds). The WAL is filtered to the passed set of tables and the output can optionally be mapped to another set of tables. WAL replay can also generate HFiles for later bulk importing, in that case the WAL is replayed for a single table only.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	WALPlayer.WALMapper A mapper that writes out Mutation to be directly applied to a running HBase instance.

Constructor Summary

Constructors

Constructor and Description
WALPlayer(Configuration conf)

Method Summary

Modifier and Type	Method and Description
Job	createSubmittableJob(String[] args) Sets up the actual job.
static void	main(String[] args) Main entry point.
int	run(String[] args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WALPlayer

public WALPlayer(Configuration conf)

Parameters:

conf - The Configuration to use.

Method Detail

createSubmittableJob

public Job createSubmittableJob(String[] args)
                         throws IOException

Sets up the actual job.

Parameters:

args - The command line parameters.

Returns:

The newly created job.

Throws:

IOException - When setting up the job fails.

main

public static void main(String[] args)
                 throws Exception

Main entry point.

Parameters:

args - The command line parameters.

Throws:

Exception - When running the job fails.

run

public int run(String[] args)
        throws Exception

Throws:

Exception