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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4114) examine performance decrease with many tablets
Date Wed, 20 Jan 2016 18:35:39 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15109089#comment-15109089
] 

Eric Newton commented on ACCUMULO-4114:
---------------------------------------

Using the test developed for ACCUMULO-4112, I ran a series of runs with different numbers
of tablets.  As expected, performance drops with more tablets.  See the attached graph.

I noticed the the tablet server was frequently running major compactions of the metadata table.


> examine performance decrease with many tablets
> ----------------------------------------------
>
>                 Key: ACCUMULO-4114
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4114
>             Project: Accumulo
>          Issue Type: Task
>          Components: client, tserver
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>             Fix For: 1.8.0
>
>         Attachments: PerfWithMoreTablets.png
>
>
> While writing a performance test for ACCUMULO-4112, I noticed the performance drop for
large numbers of tablets hosted on a single server.
> Some decrease in performance is expected since the various queues and buffers are being
divided among a greater number of tablets, but a 5x decrease is unexpected.  Given other fixes
(ACCUMULO-3423, for example) I would not expect performance to drop off so dramatically.
> Investigate the performance of conditional updates going to many tablets, vs one tablet.



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