org.apache.hadoop.hbase.zookeeper

Class RegionServerTracker

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

org.apache.hadoop.hbase.zookeeper.RegionServerTracker

@InterfaceAudience.Private
public class RegionServerTracker
extends ZooKeeperListener

Tracks the online region servers via ZK.

Handling of new RSs checking in is done via RPC. This class is only responsible for watching for expired nodes. It handles listening for changes in the RS node list and watching each node.

If an RS node gets deleted, this automatically handles calling of ServerManager.expireServer(ServerName)

Field Summary

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

watcher

Constructor Summary

Constructors

Constructor and Description
RegionServerTracker(ZooKeeperWatcher watcher, Server server, ServerManager serverManager)

Method Summary

Modifier and Type	Method and Description
List<ServerName>	getOnlineServers() Gets the online servers.
HBaseProtos.RegionServerInfo	getRegionServerInfo(ServerName sn)
void	nodeChildrenChanged(String path) Called when an existing node has a child node added or removed.
void	nodeDeleted(String path) Called when a node has been deleted
void	start() Starts the tracking of online RegionServers.

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

getWatcher, nodeCreated, nodeDataChanged

Methods inherited from class java.lang.Object

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

Constructor Detail

RegionServerTracker

public RegionServerTracker(ZooKeeperWatcher watcher,
                           Server server,
                           ServerManager serverManager)

Method Detail

start

public void start()
           throws KeeperException,
                  IOException

Starts the tracking of online RegionServers.

All RSs will be tracked after this method is called.

Throws:

KeeperException

IOException

nodeDeleted

public void nodeDeleted(String path)

Description copied from class: ZooKeeperListener

Called when a node has been deleted

Overrides:

nodeDeleted in class ZooKeeperListener

Parameters:

path - full path of the deleted node

nodeChildrenChanged

public void nodeChildrenChanged(String path)

Description copied from class: ZooKeeperListener

Called when an existing node has a child node added or removed.

Overrides:

nodeChildrenChanged in class ZooKeeperListener

Parameters:

path - full path of the node whose children have changed

getRegionServerInfo

public HBaseProtos.RegionServerInfo getRegionServerInfo(ServerName sn)

getOnlineServers

public List<ServerName> getOnlineServers()

Gets the online servers.

Returns:

list of online servers