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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-91) Launch QueryMaster on NodeManager per query
Date Wed, 24 Jul 2013 15:53:49 GMT

    [ https://issues.apache.org/jira/browse/TAJO-91?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13718509#comment-13718509

Hyunsik Choi commented on TAJO-91:

So far, QueryMaster (QM) has been already an application master (AM) of Yarn. But, each QM
is played as an unmanaged AM that actually is not launched in an allocated container. This
issue is to enable QM to be launched in an container allocated from Yarn Resource Manager.
It may eliminate the single point of failure of QM and mitigate bottleneck. This issue is

> Launch QueryMaster on NodeManager per query
> -------------------------------------------
>                 Key: TAJO-91
>                 URL: https://issues.apache.org/jira/browse/TAJO-91
>             Project: Tajo
>          Issue Type: Sub-task
>          Components: master
>            Reporter: hyoungjunkim
>            Assignee: hyoungjunkim
>             Fix For: 0.3-incubating
> In the current implementation, TajoMaster creates a QueryMaster per qeury in same JVM.
If many queries run concurrently, TajoMaster is bottleneck.
> TajoMaster launches QueryMaster on NodeManager when query requested.

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