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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15128) Disable region splits and merges in HBCK
Date Thu, 28 Jan 2016 23:30:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122526#comment-15122526
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Enis Soztutar commented on HBASE-15128:
---------------------------------------

bq. why a setSwitch() api instead of something like updateConfigurationProperty() or something
more generic?
Hmm, we actually do not have configuration options to enable / disable balancer. They are
usually always on of course. Only turned off in maintenance mode. So they are really not configuration
related. 
bq. I prefer having the flag in normalizer, just because we keep down the number of dynamic
property that we have now. as soon as you add a generic setSwitch() api that number will go
up exponentially.
The new split or merge switch is not directly related to normalizer. It allows to disable
all splits or merges, rather than changing normalizer behavior to do splits or merges. 

> 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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