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https://issues.apache.org/jira/browse/TAJO-1069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14146093#comment-14146093
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Mai Hai Thanh commented on TAJO-1069:
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[~blrunner], I see a recent svn commit that adds a great document for
TajoMaster HA by you. I will be nice if you will also write another one for
TajoWorker. Until now, in the documentation, it is not clear what will happen
if a TajoWorker crashes or fails, especially when that worker is participating
in the processing of a query.
> Add document to explain High Availability support
> -------------------------------------------------
>
> Key: TAJO-1069
> URL: https://issues.apache.org/jira/browse/TAJO-1069
> Project: Tajo
> Issue Type: Sub-task
> Components: documentation
> Affects Versions: 0.9.0
> Reporter: Mai Hai Thanh
> Fix For: 0.9.0
>
>
> High Availability (HA) support is important for large-scale and distributed
> systems like Tajo. As I know, Tajo at least supports HA for TajoMaster
> (TAJO-704). However, it is not clear how HA is supported for other components
> and how Tajo reacts in different situations. In the documentation, we should
> talk about it. For example, we can provide the answers for the following (or
> more) questions.
> + What happen if TajoMaster crashes ? for both cases,
> - When there is no query running.
> - When there is one (or more) query running
>
> + What happen if a TajoWorker crashes ? for both cases,
> - When there is no query running.
> - When there is one (or more) query running
> For the above questions, the case when there is a running query is very
> important because we say "... Tajo is designed for both interactive and
> *batch* queries ... Tajo provides fault-tolerance ... for *long-running
> queries* ...".
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