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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13103) [ergonomics] add region size balancing as a feature of master
Date Tue, 23 Jun 2015 06:12:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14597230#comment-14597230
] 

Hadoop QA commented on HBASE-13103:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12741223/HBASE-13103-branch-1.v3.patch
  against branch-1 branch at commit 6a537eb8545c7dd6c01c0d911ad12e789eeab3ae.
  ATTACHMENT ID: 12741223

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 8 new or modified
tests.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/14521//console

This message is automatically generated.

> [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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