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Posted to common-issues@hadoop.apache.org by "Todd Lipcon (Updated) (JIRA)" <ji...@apache.org> on 2012/03/27 06:33:39 UTC
[jira] [Updated] (HADOOP-8220) ZKFailoverController doesn't handle
failure to become active correctly
[ 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
> 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: ha
> Affects Versions: 0.23.3, 0.24.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Attachments: 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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