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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4298) Support to drain RS nodes through ZK
Date Tue, 21 May 2013 20:05:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13663313#comment-13663313
] 

Jonathan Hsieh commented on HBASE-4298:
---------------------------------------

Adding a link to the blog entry by aravind that explains how to use this: http://inchoate-clatter.blogspot.com/2012/03/hbase-ops-automation.html
                
> 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
>
>         Attachments: 4298-trunk-v2.txt, 4298-trunk-v3.txt, 90_hbase.patch, drainingservertest.txt,
drainingservertest-v2.txt, trunk_hbase.patch, trunk_with_test.txt
>
>
> 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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