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Date: Tue, 7 Apr 2015 05:51:12 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
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Message-ID: <JIRA.12818634.1428338931000.11495.1428385872715@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-13412) Region split decisions should have
 jitter
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    [ https://issues.apache.org/jira/browse/HBASE-13412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14482639#comment-14482639 ] 

Hadoop QA commented on HBASE-13412:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12723532/HBASE-13412-v3.patch
  against master branch at commit 8c740f43093671cfd4cc2b1052d8556e0d492c13.
  ATTACHMENT ID: 12723532

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

    {color:green}+1 tests included{color}.  The patch appears to include 4 new or modified tests.

    {color:green}+1 hadoop versions{color}. The patch compiles with all supported hadoop versions (2.4.1 2.5.2 2.6.0)

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of javac compiler warnings.

    {color:green}+1 protoc{color}.  The applied patch does not increase the total number of protoc compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 checkstyle{color}.  The applied patch does not increase the total number of checkstyle errors

    {color:green}+1 findbugs{color}.  The patch does not introduce any  new Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/13590//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/13590//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/13590//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/13590//console

This message is automatically generated.

> Region split decisions should have jitter
> -----------------------------------------
>
>                 Key: HBASE-13412
>                 URL: https://issues.apache.org/jira/browse/HBASE-13412
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>    Affects Versions: 1.0.0, 2.0.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: HBASE-13412-v1.patch, HBASE-13412-v2.patch, HBASE-13412-v3.patch, HBASE-13412.patch
>
>
> Whenever a region splits it causes lots of IO (compactions are queued for a while). Because of this it's important to make sure that well distributed tables don't have all of their regions split at exactly the same time.
> This is basically the same as our compaction jitter.


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