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https://issues.apache.org/jira/browse/TAJO-1507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyunsik Choi resolved TAJO-1507.
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Resolution: Fixed
> Resource leak when a worker does not response KILLED message
> ------------------------------------------------------------
>
> Key: TAJO-1507
> URL: https://issues.apache.org/jira/browse/TAJO-1507
> Project: Tajo
> Issue Type: Improvement
> Components: Resource Manager, Worker
> Reporter: Hyunsik Choi
> Fix For: 0.11.0
>
>
> Terminology
> * QM - query master
> * TM - tajo master
> The query kill mechanism is as follows:
> * Client sends kill command to TM.
> * TM forwards the kill command to QM.
> * QM disseminates the kill command to all workers.
> * Corresponding workers kill tasks and response KILLED to QM.
> BTW, Some workers cannot response KILLED message to QM due to its node
> failure, temporary network problem, or worker restart. In this case, TM
> cannot retrieve allocated resources even though the workers become normal.
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