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From "Aman Poonia (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17304) Avoid draining region servers in draining mode while moving the regions at client side i.e. in region_mover.rb
Date Tue, 13 Dec 2016 15:37:59 GMT
Aman Poonia created HBASE-17304:
-----------------------------------

             Summary: Avoid draining region servers in draining mode while moving the regions
at client side i.e. in region_mover.rb
                 Key: HBASE-17304
                 URL: https://issues.apache.org/jira/browse/HBASE-17304
             Project: HBase
          Issue Type: Improvement
          Components: Client
            Reporter: Aman Poonia


While using region_mover.rb  in our testing we faced an issue where region_mover was taking
a lot of time to unload regions.

For instance we take 10 region server and create draining znode for 8. So while moving the
regions region_mover.rb doesn't take draining znode in consideration and it tries to move
the region in all the region server which are available so it fails at the server side and
then it sleeps for some second and retries 5 time for each region and iterates over all the
region servers. This makes this process really slow in extreme cases as mentioned above where
a lot of nodes in a cluster are in draining mode. 

We need to get the list of draining region servers so that we can avoid them while moving
region.



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