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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15128) Disable region splits and merges in HBCK
Date Thu, 28 Jan 2016 22:32:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122446#comment-15122446
] 

Matteo Bertozzi commented on HBASE-15128:
-----------------------------------------

why a setSwitch() api instead of something like updateConfigurationProperty() or something
more generic?

to me introducing a new generic rpc that basically does only on/off seems to bring us in a
direction where 3/4 months from now we have to deal with how to try to keep compatibility.
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.

We talked already about having dynamic configuration changes, which to me seems the generic
solution that solve also this problem. so, why not trying to go in that direction?

> 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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