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

Constructors

Constructor and Description
DrainingServerTracker(ZooKeeperWatcher watcher, Abortable abortable, ServerManager serverManager)

Method Summary

Modifier and Type	Method and Description
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 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 KeeperException,
                  IOException

Starts the tracking of draining RegionServers.

All Draining 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