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https://issues.apache.org/jira/browse/HBASE-13103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485581#comment-14485581
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Nick Dimiduk commented on HBASE-13103:
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[~mantonov]:
bq. probably just like with balancer, there shoud be admin rpc call to turn
balancer on/off?
Yes, that would be good. Exposure through shell would be desirable as well, and
a get status as well.
bq. Need to have "ideal" region size?
That's a good point. Probably "ideal size" is some percentage (70% ?) of the
max region size, with a close enough allowance (ie, this normalizer's target
region size is 70 +/- 5% of {{hbase.hregion.max.filesize}}.
Thanks for coming around [~phobos182]!
bq. Since this operation is pretty impactful on performance...
I see this as not a single operation you run to normalize a table all at once,
but rather something that happens in the background all the time, a kind of
"active anti-entropy" happening behind the scenes to nudge a table into an
ideal state. You think even a single split/merge operation is too heavy-weight
to be done without premeditation?
> [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
> Fix For: 2.0.0, 1.1.0
>
> 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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