org.apache.hadoop.hbase.master.zksyncer

Class ClientZKSyncer

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZKListener

org.apache.hadoop.hbase.master.zksyncer.ClientZKSyncer

Direct Known Subclasses:

MasterAddressSyncer, MetaLocationSyncer

@InterfaceAudience.Private
public abstract class ClientZKSyncer
extends ZKListener

Tracks the target znode(s) on server ZK cluster and synchronize them to client ZK cluster if changed

The target znode(s) is given through getPathsToWatch() method

Field Summary

Fields inherited from class org.apache.hadoop.hbase.zookeeper.ZKListener

watcher

Constructor Summary

Constructors

Constructor and Description
ClientZKSyncer(ZKWatcher watcher, ZKWatcher clientZkWatcher, Server server)

Method Summary

Modifier and Type	Method and Description
protected abstract Set<String>	getPathsToWatch() Returns the zk path(s) to watch
void	nodeCreated(String path)
void	nodeDataChanged(String path)
void	nodeDeleted(String path)
protected void	refreshWatchingList()
void	start() Starts the syncer
protected abstract boolean	validate(String path) Validate whether a znode path is watched by us

Methods inherited from class org.apache.hadoop.hbase.zookeeper.ZKListener

getWatcher, nodeChildrenChanged

Methods inherited from class java.lang.Object

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

Constructor Detail

ClientZKSyncer

public ClientZKSyncer(ZKWatcher watcher,
                      ZKWatcher clientZkWatcher,
                      Server server)

Method Detail

start

public void start()
           throws org.apache.zookeeper.KeeperException

Starts the syncer

Throws:

org.apache.zookeeper.KeeperException - if error occurs when trying to create base nodes on client ZK

nodeCreated

public void nodeCreated(String path)

Overrides:

nodeCreated in class ZKListener

nodeDataChanged

public void nodeDataChanged(String path)

Overrides:

nodeDataChanged in class ZKListener

nodeDeleted

public void nodeDeleted(String path)

Overrides:

nodeDeleted in class ZKListener

validate

protected abstract boolean validate(String path)

Validate whether a znode path is watched by us

Parameters:

path - the path to validate

Returns:

true if the znode is watched by us

getPathsToWatch

protected abstract Set<String> getPathsToWatch()

Returns the zk path(s) to watch

refreshWatchingList

protected final void refreshWatchingList()