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From "Manukranth Kolloju (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9815) Add Histogram representative of row key distribution inside a region.
Date Wed, 15 Jan 2014 03:51:22 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Manukranth Kolloju updated HBASE-9815:
--------------------------------------

    Attachment: Histogram-9815.diff

Attaching the implementation based on the above paper.

> 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
>
>         Attachments: Histogram-9815.diff
>
>
> 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 in the HFile in the trailer
and populate this on compaction and 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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