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https://issues.apache.org/jira/browse/HBASE-15128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15156186#comment-15156186
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Ted Yu commented on HBASE-15128:
--------------------------------

Heng:
Please don't delete QA results.

> Disable region splits and merges switch in master
> -------------------------------------------------
>
>                 Key: HBASE-15128
>                 URL: https://issues.apache.org/jira/browse/HBASE-15128
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Enis Soztutar
>            Assignee: Heng Chen
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: HBASE-15128.patch, HBASE-15128_v1.patch, 
> HBASE-15128_v3.patch, HBASE-15128_v5.patch, HBASE-15128_v6.patch, 
> HBASE-15128_v7.patch
>
>
> 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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