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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-9220) Unnecessary transition to standby in ActiveStandbyElector
Date Mon, 13 May 2013 20:21:18 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-9220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-9220:
--------------------------------

    Attachment: hadoop-9220.txt

Hey Tom. I think you can just use the {{wantsToBeInElection}} variable here rather than going
back to ZK to check the current state of the znode (which I fear might be race-prone). How
does this patch look to you? It seems to pass the test you added.
                
> Unnecessary transition to standby in ActiveStandbyElector
> ---------------------------------------------------------
>
>                 Key: HADOOP-9220
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9220
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ha
>            Reporter: Tom White
>            Assignee: Tom White
>            Priority: Critical
>         Attachments: HADOOP-9220.patch, HADOOP-9220.patch, hadoop-9220.txt
>
>
> When performing a manual failover from one HA node to a second, under some circumstances
the second node will transition from standby -> active -> standby -> active. This
is with automatic failover enabled, so there is a ZK cluster doing leader election.

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