curator-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jordan Zimmerman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CURATOR-15) LeaderSelector may (undetectably) fail to elect
Date Sat, 11 May 2013 20:45:15 GMT

     [ https://issues.apache.org/jira/browse/CURATOR-15?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jordan Zimmerman updated CURATOR-15:
------------------------------------

    Fix Version/s: 2.0.1-incubating
    
> LeaderSelector may (undetectably) fail to elect
> -----------------------------------------------
>
>                 Key: CURATOR-15
>                 URL: https://issues.apache.org/jira/browse/CURATOR-15
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Recipes
>    Affects Versions: 2.0.0-incubating
>            Reporter: Shevek
>            Assignee: Jordan Zimmerman
>             Fix For: 2.0.1-incubating
>
>
> In LeaderSelector, if mutex.acquire() throws an Exception, for example because CuratorFramework.getZooKeeper()
threw a previously-enqueued background exception, then that failure will propagate out of
doWork and doWorkLoop, and kill the background submission onto the executor service.
> This means that a leaderselector which was start()ed will NEVER elect, and this situation
is NOT DETECTABLE externally, since that exception happens on a private executorservice thread
and is not client visible. It's impossible to look at a LeaderSelector and decide whether
it is still "viable".
> This can leave a machine/process "hung" and not automatically recoverable within curator.
> Either isQueued() needs to be exposed, which means that a leader is either elected or
queued; or the finally{} block which calls clearIsQueued() needs also to set state to CLOSED
or FAILED, so that we can query this failure externally.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message