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From "Aravind Gottipati (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4298) Support to drain RS nodes through ZK
Date Tue, 30 Aug 2011 11:59:37 GMT
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: Minor
             Fix For: 0.90.4

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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