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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5549) Master can fail if ZooKeeper session expires
Date Thu, 23 Aug 2012 04:30:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440044#comment-13440044
] 

Lars Hofhansl commented on HBASE-5549:
--------------------------------------

@Stack: are you planning to integrate the patch into 0.92? If so, let's mark this issue with
fix version of 0.92 (and 0.94)... Should have a 0.94 patch as well.
                
> Master can fail if ZooKeeper session expires
> --------------------------------------------
>
>                 Key: HBASE-5549
>                 URL: https://issues.apache.org/jira/browse/HBASE-5549
>             Project: HBase
>          Issue Type: Bug
>          Components: master, zookeeper
>    Affects Versions: 0.96.0
>         Environment: all
>            Reporter: nkeywal
>            Assignee: nkeywal
>            Priority: Minor
>             Fix For: 0.96.0
>
>         Attachments: 5549_092.txt, 5549.v10.patch, 5549.v11.patch, 5549.v6.patch, 5549.v7.patch,
5549.v8.patch, 5549.v9.patch, nochange.patch
>
>
> There is a retry mechanism in RecoverableZooKeeper, but when the session expires, the
whole ZooKeeperWatcher is recreated, hence the retry mechanism does not work in this case.
This is why a sleep is needed in TestZooKeeper#testMasterSessionExpired: we need to wait for
ZooKeeperWatcher to be recreated before using the connection.
> This can happen in real life, it can happen when:
> - master & zookeeper starts
> - zookeeper connection is cut
> - master enters the retry loop
> - in the meantime the session expires
> - the network comes back, the session is recreated
> - the retries continues, but on the wrong object, hence fails.

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