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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-931) Oscillations in Accumulo Ingest Performance
Date Fri, 04 Jan 2013 17:58:14 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13544074#comment-13544074
] 

Eric Newton commented on ACCUMULO-931:
--------------------------------------

I would graph ingest performance vs # tablets.  I'll bet that you find that ingest performance
dips when the table splits.  If you prevent automatic splitting, or wait long enough for the
automatic splitting to complete, you should see ingest performance become steady.

                
> Oscillations in Accumulo Ingest Performance
> -------------------------------------------
>
>                 Key: ACCUMULO-931
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-931
>             Project: Accumulo
>          Issue Type: Bug
>    Affects Versions: 1.4.2
>         Environment: 
>            Reporter: Jeremy Kepner
>         Attachments: 1ingestor.pdf, 2ingestor.pdf, 3ingestor.pdf, 4ingestor.pdf
>
>
> Linux 2.6.32, single node, 32 cores, 96 GB RAM, 3x3TB SATA drives, RAID5
> Ingest performance into accumulo varies by 2.5x.  Depending upon the number of ingestors.
> Performance tests were carried out using Graph500 benchmark (see d4m_api/examples/3Scaling/2ParallelDatabase/pDB10_EdgeInsertTEST.m
from http://www.mit.edu/~kepner/D4M/).

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