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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15128) Disable region splits and merges in HBCK
Date Fri, 29 Jan 2016 02:05:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122757#comment-15122757
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Enis Soztutar commented on HBASE-15128:
---------------------------------------

bq. assuming we add this setSwitch() now, and later we add dynamic conf. how one decide when
to use one vs the other? since they are able to do the same thing?
The current dynamic configuration we have is more like, change the hbase-site.xml, but load
it from the daemon without restart. Here, we want to be able to change the behavior of some
master chores on demand from code. So the current dynamic conf framework does not match I
think. If we do  {{hbase.loadbalancer.enable}} in configuration, and keep this persisted as
a dynamic switch somewhere, how do we decide which one is in affect? 


> 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
>            Assignee: Heng Chen
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: HBASE-15128.patch, HBASE-15128_v1.patch, HBASE-15128_v3.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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