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java.lang.Objectorg.apache.hadoop.hbase.zookeeper.ZooKeeperListener
org.apache.hadoop.hbase.zookeeper.DrainingServerTracker
@InterfaceAudience.Private public class DrainingServerTracker
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 |
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Fields inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener |
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watcher |
Constructor Summary | |
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DrainingServerTracker(ZooKeeperWatcher watcher,
Abortable abortable,
ServerManager serverManager)
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Method Summary | |
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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 |
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nodeCreated, nodeDataChanged |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public DrainingServerTracker(ZooKeeperWatcher watcher, Abortable abortable, ServerManager serverManager)
Method Detail |
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public void start() throws org.apache.zookeeper.KeeperException, IOException
All Draining RSs will be tracked after this method is called.
org.apache.zookeeper.KeeperException
IOException
public void nodeDeleted(String path)
ZooKeeperListener
nodeDeleted
in class ZooKeeperListener
path
- full path of the deleted nodepublic void nodeChildrenChanged(String path)
ZooKeeperListener
nodeChildrenChanged
in class ZooKeeperListener
path
- full path of the node whose children have changed
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