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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15324) Jitter may cause desiredMaxFileSize overflow in ConstantSizeRegionSplitPolicy and trigger unexpected split
Date Thu, 17 Nov 2016 23:59:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15675207#comment-15675207
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Hudson commented on HBASE-15324:
--------------------------------

SUCCESS: Integrated in Jenkins build HBase-1.1-JDK7 #1820 (See [https://builds.apache.org/job/HBase-1.1-JDK7/1820/])
HBASE-17058 Lower epsilon used for jitter verification from HBASE-15324 (esteban: rev 7c58547a37c85a148f481398819badd7c26129bc)
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ConstantSizeRegionSplitPolicy.java


> Jitter may cause desiredMaxFileSize overflow in ConstantSizeRegionSplitPolicy and trigger
unexpected split
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-15324
>                 URL: https://issues.apache.org/jira/browse/HBASE-15324
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 1.1.3
>            Reporter: Yu Li
>            Assignee: Yu Li
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 1.2.5, 1.1.8
>
>         Attachments: HBASE-15324.patch, HBASE-15324_v2.patch, HBASE-15324_v3.patch, HBASE-15324_v3.patch
>
>
> We introduce jitter for region split decision in HBASE-13412, but the following line
in {{ConstantSizeRegionSplitPolicy}} may cause long value overflow if MAX_FILESIZE is specified
to Long.MAX_VALUE:
> {code}
> this.desiredMaxFileSize += (long)(desiredMaxFileSize * (RANDOM.nextFloat() - 0.5D) *
jitter);
> {code}
> In our case we specify MAX_FILESIZE to Long.MAX_VALUE to prevent target region to split.



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