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Posted to dev@curator.apache.org by "Jordan Zimmerman (JIRA)" <ji...@apache.org> on 2013/05/12 00:55:15 UTC
[jira] [Commented] (CURATOR-15) LeaderSelector may (undetectably)
fail to elect
[ https://issues.apache.org/jira/browse/CURATOR-15?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13655387#comment-13655387 ]
Jordan Zimmerman commented on CURATOR-15:
-----------------------------------------
Can someone attach a test that demonstrates this issue?
> 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.
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