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

RegionServerTracker(ZooKeeperWatcher watcher, Abortable abortable, ServerManager serverManager)

Method Summary

List<ServerName>	getOnlineServers() Gets the online servers.
org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionServerInfo	getRegionServerInfo(ServerName sn)
void	nodeChildrenChanged(String path)
void	nodeDeleted(String path)
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,
                           Abortable abortable,
                           ServerManager serverManager)

Method Detail

start

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

Starts the tracking of online RegionServers.

All RSs will be tracked after this method is called.

Throws:

org.apache.zookeeper.KeeperException

IOException

nodeDeleted

public void nodeDeleted(String path)

Overrides:

nodeDeleted in class ZooKeeperListener

nodeChildrenChanged

public void nodeChildrenChanged(String path)

Overrides:

nodeChildrenChanged in class ZooKeeperListener

getRegionServerInfo

public org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionServerInfo getRegionServerInfo(ServerName sn)

getOnlineServers

public List<ServerName> getOnlineServers()

Gets the online servers.

Returns:

list of online servers