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https://issues.apache.org/jira/browse/HBASE-13103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14486841#comment-14486841
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Lars Hofhansl commented on HBASE-13103:
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Yeah, meant the "reshaping" after I identified that something is odd/bad about
a table.
But maybe it's better to just automate, otherwise nobody would use it, as you
say.
Splits already happen automatically with nice simple local-only logic do we
need more logic for those? (but we could get rid of
IncreasingToUpperBoundRegionSplitPolicy and combine it all in one class, which
would be nice).
bq. could have policy which is much more conservative in merging, than it is in
splitting
I think that'd be nice. With IncreasingToUpperBoundRegionSplitPolicy it's
possible that we get a 2x size difference between regions for a bit. Hard to
say whether a region will be written to in the future, and avoid an early
merge. Maybe we can track the age of a region? And then favor older regions for
merges unless they're hot...
bq. ServerLoad and RegionLoad won't suffice you think?
You're right, that's probably all the information we need. And if not, we'd add
it.
> [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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