[jira] [Commented] (TAJO-819) KillQuery does not work query occasionally.

["Jaehwa Jung (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TAJO-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995970#comment-13995970 ] 

Jaehwa Jung commented on TAJO-819:
----------------------------------

This patch includes a few features as follows:

* Added StateMachine for QueryUnit and QueryUnitAttempt
* Added StateMachine type for debugging
* Check stopped QueryId for blocking unexpected resource requests


> KillQuery does not work query occasionally.
> -------------------------------------------
>
>                 Key: TAJO-819
>                 URL: https://issues.apache.org/jira/browse/TAJO-819
>             Project: Tajo
>          Issue Type: Bug
>          Components: query master, worker
>            Reporter: Jaehwa Jung
>            Assignee: Jaehwa Jung
>             Fix For: 0.9.0, 0.8.1
>
>         Attachments: TAJO-819.patch
>
>
> There are two types of killing queries. First is that QueryMaster cancel QueryUnitAttempt before QueryUnitAttempt be passed to TajoWorker. Second is that TajoWorker cancel running QueryUnitAttempt.
> If QueryMaster cancel QueryUnitAttempts, it will be stopped.  But unfortunately, at nearly the same time, a few QueryUnitAttempts can be passed to TajoWorker. And these never will be stopped because it can't find valid state for state machines.



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