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From "Jaehwa Jung (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-704) TajoMaster HA
Date Wed, 02 Apr 2014 01:52:15 GMT

    [ https://issues.apache.org/jira/browse/TAJO-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13957241#comment-13957241
] 

Jaehwa Jung commented on TAJO-704:
----------------------------------

Hello Alvin

I really appreciate your comment. It seems to be very useful to implement this issue.
And If possible, would you mind taking this issue?

Actually, I haven't started this issue yet. But, you seem to start this issue. I'm Ok even
if you proceed this issue. Would you mind taking this issue?

Best Regards
Jaehwa


> TajoMaster HA
> -------------
>
>                 Key: TAJO-704
>                 URL: https://issues.apache.org/jira/browse/TAJO-704
>             Project: Tajo
>          Issue Type: Improvement
>          Components: tajo master
>            Reporter: Jaehwa Jung
>            Assignee: Jaehwa Jung
>         Attachments: TAJO-704.Henrick.01.patch.txt, TajoMasterHAdraft.pdf
>
>
> TajoMaster is a Single Point of Failure in a Tajo Cluster because TajoMaster is the central
controlling entity for all components of the Tajo system. TajoMaster failure prevents clients
from submitting new queries to the cluster, and results in the disruption of the ability to
run insert overwrite queries because the TajoWorker can’t apply its statistical information
to CatalogStore. Therefore, the high-availability (HA) of TajoMaster is essential for the
high-availability of Tajo generally. 



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