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https://issues.apache.org/jira/browse/HBASE-13103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14599540#comment-14599540
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Ted Yu commented on HBASE-13103:
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I have been thinking about the implications of this feature when namespace
quota is turned on.
Consider this scenario: the sum of regions of the tables in a particular
namespace is close to the quota of this namespace. After some normalization
activities, the sum of regions of the tables approaches the quota even further.
When user wants to create a (pre-split) table in the same namespace, he / she
may find out that there is not enough quota for the new table.
I have a simple patch which disables normalization when the underlying
namespace is under quota control.
If people think the above idea is plausible, I can create a JIRA so that we
continue discussion there.
> [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: Improvement
> Components: Balancer, Usability
> Reporter: Nick Dimiduk
> Assignee: Mikhail Antonov
> Fix For: 2.0.0, 1.2.0, 1.3.0
>
> Attachments: HBASE-13103-branch-1.v3.patch, HBASE-13103-v0.patch,
> HBASE-13103-v1.patch, HBASE-13103-v2.patch, HBASE-13103-v3.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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