org.apache.hadoop.hbase.zookeeper
Class DrainingServerTracker

java.lang.Object
  org.apache.hadoop.hbase.zookeeper.ZooKeeperListener
      org.apache.hadoop.hbase.zookeeper.DrainingServerTracker

@InterfaceAudience.Private
public class DrainingServerTracker
extends ZooKeeperListener

Tracks the list of draining region servers via ZK.

This class is responsible for watching for changes to the draining servers list. It handles adds/deletes in the draining RS list and watches each node.

If an RS gets deleted from draining list, we call ServerManager.removeServerFromDrainList(ServerName)

If an RS gets added to the draining list, we add a watcher to it and call ServerManager.addServerToDrainList(ServerName)

Field Summary

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

watcher

Constructor Summary

DrainingServerTracker(ZooKeeperWatcher watcher, Abortable abortable, ServerManager serverManager)

Method Summary

void	nodeChildrenChanged(String path)
void	nodeDeleted(String path)
void	start() Starts the tracking of draining 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

DrainingServerTracker

public DrainingServerTracker(ZooKeeperWatcher watcher,
                             Abortable abortable,
                             ServerManager serverManager)

Method Detail

start

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

Starts the tracking of draining RegionServers.

All Draining 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