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From "Jordan Zimmerman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CURATOR-89) ChildReaper only checks for children once
Date Tue, 25 Feb 2014 22:41:20 GMT

     [ https://issues.apache.org/jira/browse/CURATOR-89?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jordan Zimmerman updated CURATOR-89:
------------------------------------

    Fix Version/s: 2.4.1

> ChildReaper only checks for children once
> -----------------------------------------
>
>                 Key: CURATOR-89
>                 URL: https://issues.apache.org/jira/browse/CURATOR-89
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Framework, Recipes
>    Affects Versions: 2.4.0
>            Reporter: David Kesler
>            Assignee: Jordan Zimmerman
>             Fix For: 2.4.1
>
>         Attachments: curator-89-test.patch
>
>
> I've created a child reaper for a particular path underneath which have a bunch of lock
paths that I want cleaned up periodically.  The problem is that I'm seeing ChildReaper.doWork
only get called once.  Thus newly added children nodes never get picked up by the child reaper
and passed to the actual reaper.
> The problem appears to be the fact that an InternalFutureTask is being submitted to the
ScheduledExecutorService through the ClosableScheduledExecutorService that ChildReaper uses.
 Putting a breakpoint on java's FutureTask.run and FutureTask.runAndReset, it looks like what
happens is that when the InternalFutureTask gets submitted to the ScheduledExecutorService,
another task gets created.  THAT task wraps the InternalFutureTask that the ClosableScheduledExecutorService
submitted to the real executor and correctly gets executed repeatedly via its runAndReset
method.  However when the outermost task executes it calls .run on the wrapped InternalFutureTask.
 The first time the InternalFutureTask itself is executed, the state of it's Sync field gets
set to RAN (2).  Then every future invocation of run on the InternaFutureTask is ignored because
the task has already run.
> The Reaper itself doesn't seem to have a problem because it's manually rescheduling the
task after every invocation rather than using scheduleWithFixedInterval.
> I don't know if it makes a difference, but I'm using the default scheduled executor for
ChildReaper.  I'm using java 6 and tried both curator 2.1.0 and 2.4.0



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