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From "Cameron McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-79) InterProcessMutex doesn't clean up after interrupt
Date Thu, 07 Aug 2014 06:47:11 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-79?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088915#comment-14088915
] 

Cameron McKenzie commented on CURATOR-79:
-----------------------------------------

I've made some changes to the unit test and can reproduce the problem. Will look into a fix.
I guess that we probably want to either query to see if the node is actually there, or just
do a delete to remove it if it is in the case where we get an exception while trying to create
the lock node. Will have a think about it.

> InterProcessMutex doesn't clean up after interrupt
> --------------------------------------------------
>
>                 Key: CURATOR-79
>                 URL: https://issues.apache.org/jira/browse/CURATOR-79
>             Project: Apache Curator
>          Issue Type: Bug
>    Affects Versions: 2.0.0-incubating, 2.1.0-incubating, 2.2.0-incubating, 2.3.0
>            Reporter: Orcun Simsek
>            Assignee: Jordan Zimmerman
>
> InterProcessMutex can deadlock if a thread is interrupted during acquire().  Specifically,
CreateBuilderImpl.pathInForeground submits a create request to ZooKeeper, and an InterruptedException
is thrown after the node is created in ZK but before ZK.create returns. ZK.create propagates
a non-KeeperException, so Curator assumes the create has failed, but does not retry, and the
node is now orphaned. At some point in the future, the node becomes the next in the acquisition
sequence, but is not reclaimed as the ZK session has not expired.
> <stack trace attached in comments below>
> Curator should catch the InterruptedException and other non-KeeperExceptions, and delete
the created node before propagating these exceptions.
> (as originally discussed on https://groups.google.com/forum/#!topic/curator-users/9ii5of8SbdQ)



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