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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-13103) [ergonomics] add region size balancing as a feature of master
Date Tue, 23 Jun 2015 06:09:01 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikhail Antonov updated HBASE-13103:
------------------------------------
      Resolution: Fixed
    Release Note: This patch adds optional ability for HMaster to normalize regions in size
(disabled by default, change hbase.normalizer.enabled property to true to turn it on). If
enabled, HMaster periodically (every 30 minutes by default) monitors tables for which normalization
is enabled in table configuration and performs splits/merges as seems appropriate. Users may
implement their own normalization strategies by implementing RegionNormalizer interface and
configuring it in hbase-site.xml. 
    Hadoop Flags: Reviewed
          Status: Resolved  (was: Patch Available)

> [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
>
>         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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