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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15128) Disable region splits and merges in HBCK
Date Tue, 19 Jan 2016 02:55:40 GMT
Enis Soztutar created HBASE-15128:

             Summary: Disable region splits and merges in HBCK
                 Key: HBASE-15128
                 URL: https://issues.apache.org/jira/browse/HBASE-15128
             Project: HBase
          Issue Type: Bug
            Reporter: Enis Soztutar
             Fix For: 2.0.0, 1.3.0

In large clusters where region splits are frequent, and HBCK runs take longer, the concurrent
splits cause further problems in HBCK since HBCK assumes a static state for the region partition
map. We have just seen a case where HBCK undo's a concurrently splitting region causing number
of inconsistencies to go up. 

We can have a mode in master where splits and merges are disabled like the balancer and catalog
janitor switches. Master will reject the split requests if regionservers decide to split.
This switch can be turned on / off by the admins and also automatically by HBCK while it is
running (similar to balancer switch being disabled by HBCK). 

HBCK  should also disable the Catalog Janitor just in case. 

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