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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 03:18:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15120683#comment-15120683
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Enis Soztutar commented on HBASE-15128:
---------------------------------------

bq. what are all these Tracker that we are adding? and why are we using zk to store persistent
data when we said that zk should be used only for non transient states and the only exception
is replication (and we are trying to get rid of that)?
I think the patch follows the same model that balancer, catalog janitor and normalizer already
use. That data is still at zookeeper. Agreed that this data should not be in zk, but it is
a different issue.  




> 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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