Snapshot HFile and region statistics at compaction time and make info available
to clients
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Key: HBASE-1811
URL: https://issues.apache.org/jira/browse/HBASE-1811
Project: Hadoop HBase
Issue Type: Improvement
Reporter: Andrew Purtell
Priority: Minor
Consider snapshotting HFile and region statistics at major and minor compaction
time and making the info available to clients:
* Key statistics
** cardinality
** length avg/min/max/stdev
** information content measure (entropy, etc.)
** histogram
etc.
* Value statistics
** length avg/min/max/stdev
** information content measure (entropy, etc.)
** histogram
etc.
* Region statistics
** density estimation
** KV count
** total storage size (on disk)
** total storage size (uncompressed)
etc.
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