Ted Yu created HBASE-14370:
------------------------------
Summary: Use separate thread for calling
ZKPermissionWatcher#refreshNodes()
Key: HBASE-14370
URL: https://issues.apache.org/jira/browse/HBASE-14370
Project: HBase
Issue Type: Improvement
Affects Versions: 0.98.0
Reporter: Ted Yu
Assignee: Ted Yu
I came off a support case (0.98.0) where main zk thread was seen doing the
following:
{code}
at
org.apache.hadoop.hbase.security.access.ZKPermissionWatcher.refreshAuthManager(ZKPermissionWatcher.java:152)
at
org.apache.hadoop.hbase.security.access.ZKPermissionWatcher.refreshNodes(ZKPermissionWatcher.java:135)
at
org.apache.hadoop.hbase.security.access.ZKPermissionWatcher.nodeChildrenChanged(ZKPermissionWatcher.java:121)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:348)
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)
{code}
There were 62000 nodes under /acl due to lack of fix from HBASE-12635, leading
to slowness in table creation because zk notification for region offline was
blocked by the above.
The attached patch separates refreshNodes() call into its own thread.
Thanks to Enis and Devaraj for offline discussion.
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