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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-308) SimpleDistributedQueue::take() hangs if container nodes are removed
Date Fri, 20 May 2016 20:41:12 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15294148#comment-15294148
] 

ASF GitHub Bot commented on CURATOR-308:
----------------------------------------

GitHub user Randgalt opened a pull request:

    https://github.com/apache/curator/pull/149

    [CURATOR-308] Parent container deletions could cause a hang

    Parent container deletions could cause a hang as the watcher would never fire. If parent
containers get deleted now, reset and recreate them

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/apache/curator CURATOR-308

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/curator/pull/149.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #149
    
----
commit 9261ee622e2e2dd7b16969561cb597712f078acd
Author: randgalt <randgalt@apache.org>
Date:   2016-05-20T20:39:36Z

    Parent container deletions could cause a hang as the watcher would never fire. If parent
containers get deleted now, reset and recreate them

----


> SimpleDistributedQueue::take() hangs if container nodes are removed
> -------------------------------------------------------------------
>
>                 Key: CURATOR-308
>                 URL: https://issues.apache.org/jira/browse/CURATOR-308
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Recipes
>    Affects Versions: 3.1.0
>         Environment: org.apache.curator:curator-recipes 3.1.0
> org.apache.curator:curator-test 3.1.0
>            Reporter: Philip Searle
>            Assignee: Jordan Zimmerman
>             Fix For: 3.1.1
>
>         Attachments: TestSimpleDistributedQueueHang.java
>
>
> SimpleDistributedQueue creates the queue using container nodes if the ZooKeeper instance
supports this feature. If ZooKeeper runs the container node cleanup task while SimpleDistributedQueue::take()
is blocking, the call will not ever return.
> A similar issue occurs when calling poll(), resulting in it delaying until the timeout
has elapsed, even if a queue item was inserted after the container cleanup occurs.



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