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From "Keith Turner (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-4314) Use statistics to choose better keys for RFile index
Date Tue, 31 May 2016 23:21:12 GMT


Keith Turner commented on ACCUMULO-4314:

I just pushed the changes.  Unfortunately I noticed that I put the wrong issue in the commit
message. I put ACCUMULO-4318 in the commit message (another issue I am currently working).
 The commit in 1.6 is 63a8a5d.  The merge commit in 1.7 is d33b2a0.

> Use statistics to choose better keys for RFile index
> ----------------------------------------------------
>                 Key: ACCUMULO-4314
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>            Priority: Blocker
>             Fix For: 1.6.6, 1.7.2
> The commit for ACCUMULO-1124 makes two changes :
>   * Generates shorter keys that may not exist in data to place in RFile index
>   * Use statistics to make better choices about what keys to place in index.  These changes
look for keys that are average or below and excludes large keys (keys that are > 3 std
> The change to generate shorter keys can not be made in 1.7.X and 1.6.X because it would
generate RFiles that may not work properly with older 1.6 and 1.7 versions.   However the
changes to use statistics to pick better keys could be made in 1.6 and 1.7. 

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