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Posted to issues@tajo.apache.org by "Jihoon Son (JIRA)" <ji...@apache.org> on 2014/11/20 02:09:34 UTC

[jira] [Assigned] (TAJO-1196) Unit test hangs occasionally and randomly

     [ https://issues.apache.org/jira/browse/TAJO-1196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jihoon Son reassigned TAJO-1196:
--------------------------------

    Assignee: Jihoon Son

> Unit test hangs occasionally and randomly
> -----------------------------------------
>
>                 Key: TAJO-1196
>                 URL: https://issues.apache.org/jira/browse/TAJO-1196
>             Project: Tajo
>          Issue Type: Bug
>          Components: test
>            Reporter: Jihoon Son
>            Assignee: Jihoon Son
>
> I reported this problem in our dev mailing list before (http://mail-archives.apache.org/mod_mbox/tajo-dev/201410.mbox/%3CCACZfFK743PCEJkz0=rdT0LTuw-AJATyOPGuNSmragPrHfC7YRA@mail.gmail.com%3E), and finally found where the problem is caused.
> The problem is, when a task runner requests a task via QueryMasterProtocolService.Interface.getTask(), the query master task is not started yet, so QueryMasterManagerService sends 'stopTaskRunnerReq' as a reply to that request. 
> This asynchronous problem may be prominent in quite slow machines.
> I'm thinking solutions, but don't still have any ones.
> Do you have any good idea?



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