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https://issues.apache.org/jira/browse/HBASE-20361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu reassigned HBASE-20361:
------------------------------
Assignee: Yuki Tawara
> Non-successive TableInputSplits may wrongly be merged by auto balancing
> feature
> -------------------------------------------------------------------------------
>
> Key: HBASE-20361
> URL: https://issues.apache.org/jira/browse/HBASE-20361
> Project: HBase
> Issue Type: Bug
> Components: mapreduce
> Reporter: Yuki Tawara
> Assignee: Yuki Tawara
> Priority: Major
> Fix For: 2.1.0
>
> Attachments: HBASE-20361.master.001.patch,
> HBASE-20361.master.002.patch
>
>
> TableInputFormatBase class offers users a mechanism to exclude specific
> splits from returned list of TableInputFormatBase#getSplits through
> TableInputFormatBase#includeRegionInSplit.
> It also offers users a feature called "auto balancing" to mitigate data skew
> by splitting large splits and merging small splits.
> If a user overrides TableInputFormatBase#includeRegionInSplit, i th split and
> i+1 th split may not be successive(i th split's end key is smaller than i+1
> th split's start key).
> If he or she further enable auto balancing feature, non-successive splits can
> be merged, which means excluded splits between merged non-successive splits
> "revive".
> To avoid such cases, we should not merge non-successive splits.
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