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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ACCUMULO-4314) Use statistics to choose better keys for RFile index
Date Wed, 01 Jun 2016 19:35:59 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-4314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christopher Tubbs updated ACCUMULO-4314:
----------------------------------------
    Fix Version/s: 1.8.0

> Use statistics to choose better keys for RFile index
> ----------------------------------------------------
>
>                 Key: ACCUMULO-4314
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4314
>             Project: Accumulo
>          Issue Type: Improvement
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>            Priority: Blocker
>             Fix For: 1.6.6, 1.7.2, 1.8.0
>
>
> 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
dev).
> 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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