Manukranth Kolloju created HBASE-9815:
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Summary: Add Histogram representative of row key distribution
inside a region.
Key: HBASE-9815
URL: https://issues.apache.org/jira/browse/HBASE-9815
Project: HBase
Issue Type: New Feature
Components: HFile
Affects Versions: 0.89-fb
Reporter: Manukranth Kolloju
Assignee: Manukranth Kolloju
Fix For: 0.89-fb
Using histogram information, users can parallelize the scan workload into equal
sized scans based on the estimated size from the Histogram information. This
will help in enabling systems which are trying to perform queries on top of
HBase to do cost based optimization while scanning. The Idea is to keep this
histogram information into the HFile in the trailer and populate this on
compaction and/or flush.
The HRegionInterface can expose an API to return the Histogram information of a
region, which can be generated by merging histograms of all the hfiles.
Implementing the histogram on the basis of
http://jmlr.org/papers/volume11/ben-haim10a/ben-haim10a.pdf
http://dl.acm.org/citation.cfm?id=1951376
and NumericHistogram from hive.
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