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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13103) [ergonomics] add region size balancing as a feature of master
Date Tue, 10 Mar 2015 17:40:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355288#comment-14355288
] 

Nick Dimiduk commented on HBASE-13103:
--------------------------------------

[~mantonov] yeah, RegionEqualizer sounds like the right idea. Maybe "normalizer"? But yes,
a background chore invokes something that analyzes current state and makes efforts to move
toward an ideal state.

UI improvements across the board are always welcome and very much encouraged. We don't get
enough love in that department. A (graphical?) representation of region sizes and distribution
would be awesome.

> [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
>
> 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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