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From "Aravind Gottipati (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4298) Support to drain RS nodes through ZK
Date Mon, 26 Sep 2011 22:45:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114995#comment-13114995
] 

Aravind Gottipati commented on HBASE-4298:
------------------------------------------

Well.. JIRA lost all my formatting in my last comment..  I hope it still makes sense.

The latest changesets are 

https://github.com/aravind/hbase/commit/46f3b58c60f4f1c81806fdad6e606badf84fc30c for trunk.

https://github.com/aravind/hbase/commit/e6cf9ecf78f8e0d6f46c2a77a524e6bccec45001 for 0.90.
                
> Support to drain RS nodes through ZK
> ------------------------------------
>
>                 Key: HBASE-4298
>                 URL: https://issues.apache.org/jira/browse/HBASE-4298
>             Project: HBase
>          Issue Type: Improvement
>          Components: master
>    Affects Versions: 0.90.4
>         Environment: all
>            Reporter: Aravind Gottipati
>            Priority: Critical
>              Labels: patch
>             Fix For: 0.92.0, 0.90.5
>
>
> HDFS currently has a way to exclude certain datanodes and prevent them from getting new
blocks.  HDFS goes one step further and even drains these nodes for you.  This enhancement
is a step in that direction.
> The idea is that we mark nodes in zookeeper as draining nodes.  This means that they
don't get any more new regions.  These draining nodes look exactly the same as the corresponding
nodes in /rs, except they live under /draining.
> Eventually, support for draining them can be added.  I am submitting two patches for
review - one for the 0.90 branch and one for trunk (in git).
> Here are the two patches
> 0.90 - https://github.com/aravind/hbase/commit/181041e72e7ffe6a4da6d82b431ef7f8c99e62d2
> trunk - https://github.com/aravind/hbase/commit/e127b25ae3b4034103b185d8380f3b7267bc67d5
> I have tested both these patches and they work as advertised.

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