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https://issues.apache.org/jira/browse/HBASE-15073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15107901#comment-15107901
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Mikhail Antonov commented on HBASE-15073:
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I don't know how many folks are running branch-1.2 builds under any realistic
workloads, so I guess until 1.2 is out and people start to actually use it, we
are unlikely to see reports from live clusters with highlights of shortcomings
of current impl. So I think at the moment the implemented (and proposed)
heuristics are assumptions, not battle-tested. Which kind of makes me wish to
make it on by default in 1.2..
> Finer grained control over normalization actions for RegionNormalizer
> ---------------------------------------------------------------------
>
> Key: HBASE-15073
> URL: https://issues.apache.org/jira/browse/HBASE-15073
> Project: HBase
> Issue Type: Task
> Components: regionserver
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 15073-v1.txt, 15073-v2.txt, 15073-v2.txt, 15073-v3.txt,
> 15073-v4.txt, 15073-v5.txt
>
>
> Currently both region split and merge actions are carried out during
> normalization for underlying table.
> However, for certain use case(s) (see
> https://issues.apache.org/jira/browse/HBASE-13103?focusedCommentId=14366255&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14366255),
> it would be desirable to perform only one type of action.
> There is one boolean flag, keyed by NORMALIZATION_ENABLED_KEY, per table that
> enables normalization.
> To provide finer grained control, we have several options:
> 1. introduce another per table flag to indicate which type(s) of actions are
> allowed ("N" for disabled, "S" for split only, "M" for merge only and "MS"
> for both split and merge)
> 2. introduce another global flag to indicate which type(s) of actions are
> allowed
> 3. modify the meaning of existing flag keyed by NORMALIZATION_ENABLED_KEY so
> that it indicates type(s) of actions
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