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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15065) SimpleRegionNormalizer should return multiple normalization plans in one run
Date Mon, 11 Jan 2016 22:31:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092820#comment-15092820
] 

Ted Yu commented on HBASE-15065:
--------------------------------

Currently normalizer chore would run all the normalization plans.

I think we should provide some throttling in certain scenarios.
e.g.
when normalization is enabled for an existing table which has many (close to) empty regions
to be merged or,
at cluster startup, the number of normalization plans for all the tables in the cluster could
be quite high

Throttling in the above scenarios would make the cluster more stable.

[~enis] [~mantonov]:
What's your opinion ?

> SimpleRegionNormalizer should return multiple normalization plans in one run
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-15065
>                 URL: https://issues.apache.org/jira/browse/HBASE-15065
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: 15065-v1.txt, 15065-v2.txt, 15065.addendum
>
>
> This is follow up to HBASE-14867 w.r.t. SimpleRegionNormalizer
> Outline for enhancements:
> * adjustment to the period when SimpleRegionNormalizer runs
> * explore merge opportunities among all neighboring region pairs
> * return multiple normalization plans



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