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https://issues.apache.org/jira/browse/HBASE-13103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337084#comment-14337084
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Mikhail Antonov commented on HBASE-13103:
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Online - you mean table-wise, or region-wise? I would think, this might work in
2 steps:
- command runs and generates "reshaping plan", which is series or split/merge
commands recommended. Then they could be either confirmed by admin (and pushed
to execution), or exported as a script for further review?
> [ergonomics] add shell,API to "reshape" a table
> -----------------------------------------------
>
> 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}
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