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Posted to issues@tajo.apache.org by "Jihoon Son (JIRA)" <ji...@apache.org> on 2014/12/08 06:11:12 UTC
[jira] [Updated] (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 updated TAJO-1196:
-----------------------------
Attachment: TAJO-1196.patch
I have improved the patch to solve this problem.
Every unit test successfully passed.
Please review it.
> 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
> Attachments: TAJO-1196.patch, TAJO-1196.patch
>
>
> 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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