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https://issues.apache.org/jira/browse/HBASE-15073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15103530#comment-15103530
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stack commented on HBASE-15073:
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I'm trying to trace the new 'normalization' feature.
What is this about?
bq. However, for certain use case(s), it would be desirable to perform only one
type of action.
A statement about 'cases' but no cases are provided.
Why do we need finer grained control? The point is that this is an ergonomic
feature that lets the machine do it for you... if need admin intervention, then
the feature is not working right... lets fix that. This issue seems to mangle
the intent of 'normalization'.
Looking at patch I see a define: DESIRED_NORMALIZATION_TYPES What does DESIRED
mean? This is a datastore, not a beach at sunset...
Users are going to see 'MS', 'M', and 'S' and are supposed to get split, merge,
etc. from this? That's not nice on our user.
I'm -1 on this thing till its explained why. I think should revert from 1.2.
Reopening.
> 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
> Fix For: 2.0.0, 1.2.0, 1.3.0
>
> 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), 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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