[jira] [Updated] (HBASE-13103) [ergonomics] add region size balancing as a feature of master

["Mikhail Antonov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-13103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mikhail Antonov updated HBASE-13103:
------------------------------------
    Attachment: HBASE-13103-v0.patch

Here's draft patch. Would appreciate any comments.  [~ndimiduk] - as you suggested this idea, I'd be glad to re-think & discuss how exactly the normalization rules should look like, what makes sense as parametrizable options etc. 

> [ergonomics] add region size balancing as a feature of master
> -------------------------------------------------------------
>
>                 Key: HBASE-13103
>                 URL: https://issues.apache.org/jira/browse/HBASE-13103
>             Project: HBase
>          Issue Type: Brainstorming
>          Components: Usability
>            Reporter: Nick Dimiduk
>            Assignee: Mikhail Antonov
>         Attachments: HBASE-13103-v0.patch
>
>
> Often enough, folks miss-judge split points or otherwise end up with a suboptimal number of regions. We should have an automated, reliable way to "reshape" or "balance" a table's region boundaries. This would be for tables that contain existing data. This might look like:
> {noformat}
> Admin#reshapeTable(TableName, int numSplits);
> {noformat}
> or from the shell:
> {noformat}
> > reshape TABLE, numSplits
> {noformat}
> Better still would be to have a maintenance process, similar to the existing Balancer that runs AssignmentManager on an interval, to run the above "reshape" operation on an interval. That way, the cluster will automatically self-correct toward a desirable state.



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