Package org.apache.hadoop.hbase.master

Class DrainingServerTracker

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZKListener

org.apache.hadoop.hbase.master.DrainingServerTracker

@Private
public class DrainingServerTracker
extends ZKListener

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)

This class is deprecated in 2.0 because decommission/draining API goes through master in 2.0. Can remove this class in 3.0.

Field Summary

Fields

Modifier and Type	Field	Description
private Abortable	abortable
private final NavigableSet<ServerName>	drainingServers
private static final org.slf4j.Logger	LOG
private ServerManager	serverManager

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

watcher

Constructor Summary

Constructors

Constructor	Description
DrainingServerTracker(ZKWatcher watcher, Abortable abortable, ServerManager serverManager)

Method Summary

Modifier and Type	Method	Description
private void	add(List<String> servers)
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
private void	remove(ServerName sn)
void	start()	Starts the tracking of draining RegionServers.

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

getWatcher, nodeCreated, nodeDataChanged

Methods inherited from class java.lang.Object

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

Field Details

LOG

private static final org.slf4j.Logger LOG

serverManager

private ServerManager serverManager

drainingServers

private final NavigableSet<ServerName> drainingServers

abortable

private Abortable abortable

Constructor Details

DrainingServerTracker

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

Method Details

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

add

private void add(List<String> servers)
          throws IOException

Throws:

IOException

remove

private void remove(ServerName sn)

nodeDeleted

public void nodeDeleted(String path)

Description copied from class: ZKListener

Called when a node has been deleted

Overrides:

nodeDeleted in class ZKListener

Parameters:

path - full path of the deleted node

nodeChildrenChanged

public void nodeChildrenChanged(String path)

Description copied from class: ZKListener

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

Overrides:

nodeChildrenChanged in class ZKListener

Parameters:

path - full path of the node whose children have changed