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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15324) Jitter may cause desiredMaxFileSize overflow in ConstantSizeRegionSplitPolicy and trigger unexpected split
Date Thu, 25 Feb 2016 06:18:18 GMT
Yu Li created HBASE-15324:
-----------------------------

             Summary: 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: 1.1.3, 2.0.0
            Reporter: Yu Li
            Assignee: Yu Li


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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