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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-931) Oscillations in Accumulo Ingest Performance
Date Sat, 05 Jan 2013 17:02:12 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13544758#comment-13544758
] 

John Vines commented on ACCUMULO-931:
-------------------------------------

You definately have tablet splitting occuring. A tablet cannot minor compact more than once
at once time, so you shouldn't be seeing multiple minor compactions unless the table split.
Or you're doing other ingest while benchmarking, which definately could have an impact on
your performance.
                
> 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, ingest_performance_explained.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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