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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8539) Double(or tripple ...) ZooKeeper listeners of the same type when Master recovers from ZK SessionExpiredException
Date Wed, 15 May 2013 22:31:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658901#comment-13658901
] 

Hudson commented on HBASE-8539:
-------------------------------

Integrated in HBase-0.94-security #141 (See [https://builds.apache.org/job/HBase-0.94-security/141/])
    HBASE-8539 Double(or tripple ...) ZooKeeper listeners of the same type when Master recovers
from ZK SessionExpiredException (Revision 1482671)

     Result = FAILURE
stack : 
Files : 
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java
* /hbase/branches/0.94/src/test/java/org/apache/hadoop/hbase/master/TestMasterZKSessionRecovery.java

                
> Double(or tripple ...) ZooKeeper listeners of the same type when Master recovers from
ZK SessionExpiredException
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-8539
>                 URL: https://issues.apache.org/jira/browse/HBASE-8539
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.98.0, 0.94.7, 0.95.0
>            Reporter: Jeffrey Zhong
>            Assignee: Jeffrey Zhong
>             Fix For: 0.98.0, 0.94.8, 0.95.1
>
>         Attachments: double-registered listeners.png, hbase-8539-0.94.patch, hbase-8539.patch,
hbase-8539.patch
>
>
> When Master tries to recover from zookeeper session expired exceptions, we don't clean
old registered listener instances. Therefore, it may end up we have two(or more) listeners
to double handling same events. Attached a screen shot from debugger to show the issue.
> I considered to limit one listener per class while I think that would limit the listener
usage so I choose to clear exiting listeners during recovery for the fix.
> (This issue is unrelated to the issue HBASE-8365 because I verified there is no dup-listeners
when HBASE-8365 happened)

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