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https://issues.apache.org/jira/browse/TAJO-1069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14148699#comment-14148699
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Jaehwa Jung commented on TAJO-1069:
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Hi [~mhthanh]
Thank you for your comments. TAJO-704 is just focused on TajoMaster HA. It
doesn't consider a TajoWorker crash or fails. I think that we need to add
another document for TajoWorker fault. Of course, I plan to add more
description to TajoMaster HA as follows:
- When there is no query running.
- When there is one (or more) query running
Cheers
Jaehwa
> 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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