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https://issues.apache.org/jira/browse/HBASE-7877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell closed HBASE-7877.
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> KeyPrefixRegionSplitPolicy and DelimitedKeyPrefixRegionSplitPolicy splits are
> not always optimal
> ------------------------------------------------------------------------------------------------
>
> Key: HBASE-7877
> URL: https://issues.apache.org/jira/browse/HBASE-7877
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Affects Versions: 0.94.5, 0.95.2
> Reporter: Robert Dyer
> Priority: Minor
>
> With KeyPrefixRegionSplitPolicy (and now
> DelimitedKeyPrefixRegionSplitPolicy), if a split would break a group of keys
> it is modified to become the first key in the group's range. This is not
> always optimal. If the distribution of keys are such that the group
> containing the split has half the keys in the region, then no split will
> occur.
> The best solution would be to compute both the current key group's first key
> (what the current implementation does) as well as the next key group's first
> key and then choosing which of the two is closest to the original split point.
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