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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8220) ZKFailoverController doesn't handle failure to become active correctly
Date Fri, 30 Mar 2012 04:52:56 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-8220:
--------------------------------

    Attachment: hadoop-8220.txt

New version addresses the above issue, handling failure to become active in the StatCallback
as well.

I also added a new unit test for this case.

As part of the stress tests in HADOOP-8228, I also have added a test case which covers this
codepath with a real ZK server (verified with Clover)
                
> ZKFailoverController doesn't handle failure to become active correctly
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-8220
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8220
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: auto-failover, ha
>    Affects Versions: 0.23.3, 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>         Attachments: hadoop-8220.txt, hadoop-8220.txt, hadoop-8220.txt, hadoop-8220.txt
>
>
> The ZKFC doesn't properly handle the case where the monitored service fails to become
active. Currently, it catches the exception and logs a warning, but then continues on, after
calling quitElection(). This causes a NPE when it later tries to use the same zkClient instance
while handling that same request. There is a test case, but the test case doesn't ensure that
the node that had the failure is later able to recover properly.

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