Robert Dyer created HBASE-7877:
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Summary: 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, 0.96.0
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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