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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14370) Use separate thread for calling ZKPermissionWatcher#refreshNodes()
Date Tue, 08 Sep 2015 20:15:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14735527#comment-14735527
] 

Ted Yu commented on HBASE-14370:
--------------------------------

w.r.t. thread leak, have you seen the following code ?
{code}
+  public void close() {
+    executor.shutdown();
{code}
w.r.t. AtomicReference, the goal is for refresher thread to be interruptible.

w.r.t. race condition between nodeChildrenChanged and nodeDeleted, if a table (namespace)
is deleted, client would get TableNotFoundException (NamespaceNotFoundException) for future
access - before ACL is checked.
Do you think tighter coordination is needed between the zk thread and the refresher thread
?

> Use separate thread for calling ZKPermissionWatcher#refreshNodes()
> ------------------------------------------------------------------
>
>                 Key: HBASE-14370
>                 URL: https://issues.apache.org/jira/browse/HBASE-14370
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>         Attachments: 14370-v1.txt, 14370-v3.txt
>
>
> 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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