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From "Josh Elser (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-931) Oscillations in Accumulo Ingest Performance
Date Mon, 07 Jan 2013 15:20:12 GMT


Josh Elser commented on ACCUMULO-931:

I believe this makes sense to me given what I understand about the BatchWriter. A flush on
the BatchWriter will return control to the caller when the Mutations have been written to
the in memory maps and to the write ahead log. A minor compaction is not a requirement for
a flush to complete.
> Oscillations in Accumulo Ingest Performance
> -------------------------------------------
>                 Key: ACCUMULO-931
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>    Affects Versions: 1.4.2
>         Environment: 
>            Reporter: Jeremy Kepner
>         Attachments: 12,r8,r10,r12ingestor_1table_12tablet.pdf, 1ingestor_1table_1tablet.pdf,
1ingestor_1table_2tablet.pdf, 1ingestor_1table_4tablet.pdf, 1ingestor.pdf, 2,3,4ingestor_1table_4tablet.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

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