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Posted to mapreduce-issues@hadoop.apache.org by "Karthik Kambatla (JIRA)" <ji...@apache.org> on 2013/09/18 09:06:53 UTC

[jira] [Updated] (MAPREDUCE-5384) Races in DelegationTokenRenewal

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Kambatla updated MAPREDUCE-5384:
----------------------------------------

    Status: Open  (was: Patch Available)
    
> Races in DelegationTokenRenewal
> -------------------------------
>
>                 Key: MAPREDUCE-5384
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5384
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 1.2.1, 1.1.2, 1.2.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: mr-5384-0.patch, mr-5384-1.patch, mr-5384-2.patch
>
>
> There are a couple of races in DelegationTokenRenewal. 
> One of them was addressed by MAPREDUCE-4860, which introduced a deadlock while fixing this race. Opening a new JIRA per discussion in MAPREDUCE-5364, since MAPREDUCE-4860 is already shipped in a release.
> Races to fix:
> # TimerTask#cancel() disallows future invocations of run(), but doesn't abort an already scheduled/started run().
> # In the context of DelegationTokenRenewal, RenewalTimerTask#cancel() only cancels that TimerTask instance. However, it has no effect on any other TimerTasks created for that token. 

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