org.apache.hadoop.hbase.replication.regionserver
Class Replication

java.lang.Object
  org.apache.hadoop.hbase.replication.regionserver.Replication

All Implemented Interfaces:

WALObserver

public class Replication
extends java.lang.Object
implements WALObserver

Gateway to Replication. Used by HRegionServer.

Constructor Summary

Replication(Server server, org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path logDir, org.apache.hadoop.fs.Path oldLogDir)
Instantiate the replication management (if rep is enabled).

Method Summary

static void	decorateMasterConfiguration(org.apache.hadoop.conf.Configuration conf) This method modifies the master's configuration in order to inject replication-related features
ReplicationSourceManager	getReplicationManager() Get the replication sources manager
static boolean	isReplication(org.apache.hadoop.conf.Configuration c)
void	join() Join with the replication threads
void	logCloseRequested() The WAL is about to close.
void	logRolled(org.apache.hadoop.fs.Path p) The WAL was rolled.
void	logRollRequested() A request was made that the WAL be rolled.
void	replicateLogEntries(HLog.Entry[] entries) Carry on the list of log entries down to the sink
void	startReplicationServices() If replication is enabled and this cluster is a master, it starts
void	visitLogEntryBeforeWrite(HRegionInfo info, HLogKey logKey, WALEdit logEdit) Called before each write.

Methods inherited from class java.lang.Object

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

Constructor Detail

Replication

public Replication(Server server,
                   org.apache.hadoop.fs.FileSystem fs,
                   org.apache.hadoop.fs.Path logDir,
                   org.apache.hadoop.fs.Path oldLogDir)
            throws java.io.IOException,
                   org.apache.zookeeper.KeeperException

Instantiate the replication management (if rep is enabled).

Parameters:

server - Hosting server

fs - handle to the filesystem

logDir -

oldLogDir - directory where logs are archived

Throws:

java.io.IOException

org.apache.zookeeper.KeeperException

Method Detail

isReplication

public static boolean isReplication(org.apache.hadoop.conf.Configuration c)

Parameters:

c - Configuration to look at

Returns:

True if replication is enabled.

join

public void join()

Join with the replication threads

replicateLogEntries

public void replicateLogEntries(HLog.Entry[] entries)
                         throws java.io.IOException

Carry on the list of log entries down to the sink

Parameters:

entries - list of entries to replicate

Throws:

java.io.IOException

startReplicationServices

public void startReplicationServices()
                              throws java.io.IOException

If replication is enabled and this cluster is a master, it starts

Throws:

java.io.IOException

getReplicationManager

public ReplicationSourceManager getReplicationManager()

Get the replication sources manager

Returns:

the manager if replication is enabled, else returns false

visitLogEntryBeforeWrite

public void visitLogEntryBeforeWrite(HRegionInfo info,
                                     HLogKey logKey,
                                     WALEdit logEdit)

Description copied from interface: WALObserver

Called before each write.

Specified by:

visitLogEntryBeforeWrite in interface WALObserver

logRolled

public void logRolled(org.apache.hadoop.fs.Path p)

Description copied from interface: WALObserver

The WAL was rolled.

Specified by:

logRolled in interface WALObserver

Parameters:

p - the path to the new hlog

decorateMasterConfiguration

public static void decorateMasterConfiguration(org.apache.hadoop.conf.Configuration conf)

This method modifies the master's configuration in order to inject replication-related features

Parameters:

conf -

logRollRequested

public void logRollRequested()

Description copied from interface: WALObserver

A request was made that the WAL be rolled.

Specified by:

logRollRequested in interface WALObserver

logCloseRequested

public void logCloseRequested()

Description copied from interface: WALObserver

The WAL is about to close.

Specified by:

logCloseRequested in interface WALObserver