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Posted to notifications@accumulo.apache.org by "Josh Elser (JIRA)" <ji...@apache.org> on 2014/01/13 21:06:59 UTC

[jira] [Commented] (ACCUMULO-2185) determine how rfile block location impacts performance

    [ https://issues.apache.org/jira/browse/ACCUMULO-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13869908#comment-13869908 ] 

Josh Elser commented on ACCUMULO-2185:
--------------------------------------

Nice, thanks for making this, [~arshak]. This is something that I really don't understand well -- it would be good for us to know definitively what's happening under the hood.

> determine how rfile block location impacts performance
> ------------------------------------------------------
>
>                 Key: ACCUMULO-2185
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2185
>             Project: Accumulo
>          Issue Type: Task
>          Components: tserver
>            Reporter: Arshak Navruzyan
>            Priority: Minor
>             Fix For: 1.7.0
>
>
> We should investigate and clearly spell out in the documentation:
> 1.  Location of RFile HDFS blocks vs. tserver assignments (is it true that "compaction leading to eventual locality" and if not, why this isn't important)
> 2.  Recommended setting HDFS balancer 
> 3.  Recommended setting for HDFS short circuit reads
> Good (but somewhat inconclusive) discussion here:
> http://mail-archives.apache.org/mod_mbox/accumulo-user/201401.mbox/%3C13A9718A-F829-4DFE-ACD6-C5195FF4C253%40clearedgeit.com%3E



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