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https://issues.apache.org/jira/browse/TAJO-1069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14162167#comment-14162167
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ASF GitHub Bot commented on TAJO-1069:
--------------------------------------
Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/180#discussion_r18535520
--- Diff: tajo-docs/src/main/sphinx/configuration/ha_configuration.rst ---
@@ -132,4 +132,16 @@ If you want to initiate HA information, execute ``tajo
haadmin -formatHA`` ::
.. note::
- Before format HA, you must shutdown the tajo cluster.
\ No newline at end of file
+ Before format HA, you must shutdown the Tajo cluster.
+
+
+================================================
+ Verify Automatic Failover
+================================================
+
+If you want to verify automatic failover, you must deploy your Tajo
cluster with TajoMaster HA enable. And then, you
+need to find which node is active by visiting the Tajo web interfaces.
--- End diff --
s/by visiting the Tajo web interfaces./from Tajo web UI/
> 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
> Assignee: Jaehwa Jung
> 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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