Add more comprehensive region split calculator
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Key: HBASE-4321
URL: https://issues.apache.org/jira/browse/HBASE-4321
Project: HBase
Issue Type: Improvement
Reporter: Jonathan Hsieh
Hbck currently scans through meta one entry at a time, only keeping a reference
to the previous meta entry. This is insufficient for capturing all the
possible problems in meta and needs something more to properly identify holes,
overlaps, duplicate start keys, and otherwise invalid meta entries.
Ideally, this calculator could also be used online interrogating an existing
meta (HBASE-4058), and also used to generate a completely new meta offline just
from regioninfo and in hdfs (HBASE-3505).
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