Support to drain RS nodes through ZK
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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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