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https://issues.apache.org/jira/browse/TAJO-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995322#comment-13995322
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Jaehwa Jung commented on TAJO-819:
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This bug is very deeply related to
[TAJO-818|https://issues.apache.org/jira/browse/TAJO-818].
> KillQuery does not work for running query on TajoWorker.
> --------------------------------------------------------
>
> 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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