[jira] [Commented] (HBASE-1811) Snapshot HFile and region statistics at compaction time and make info available to clients

["Andrew Purtell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-1811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13994721#comment-13994721 ] 

Andrew Purtell commented on HBASE-1811:
---------------------------------------

Is this a dup of HBASE-7958 (well, maybe I had the idea first, but it is execution that counts) or could it be a subtask? 

Ping [~jesse_yates] [~lhofhansl] [~stack]

> Snapshot HFile and region statistics at compaction time and make info available to clients
> ------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1811
>                 URL: https://issues.apache.org/jira/browse/HBASE-1811
>             Project: 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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