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https://issues.apache.org/jira/browse/HBASE-15128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122569#comment-15122569
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Matteo Bertozzi commented on HBASE-15128:
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{quote}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.{quote}
they are not configuration, because we don't have dynamic configuration.
pretty sure if we had dynamic conf, we ended up with a conf.set("xyz.enable",
...)
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?
{quote}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.{quote}
this is just me not knowing what the normalizer is. I was assuming the
normalizer was taking care of all the split/merge related stuff now. sorry, but
I haven’t looked at that code yet and I was just making an assumption.
and the switch we had already for the normalizer seemed a good place to keep
down the number of rpc calls that will end up "redundant" if we add dynamic
configuration support.
> 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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