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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-4462) Publishing flushed segments is single threaded and too costly
Date Wed, 10 Oct 2012 07:43:03 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-4462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Simon Willnauer updated LUCENE-4462:
------------------------------------

          Component/s: core/index
        Lucene Fields: New,Patch Available  (was: New)
    Affects Version/s: 4.0
                       4.0-ALPHA
                       4.0-BETA
        Fix Version/s: 5.0
                       4.1
    
> Publishing flushed segments is single threaded and too costly
> -------------------------------------------------------------
>
>                 Key: LUCENE-4462
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4462
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>    Affects Versions: 4.0-ALPHA, 4.0-BETA, 4.0
>            Reporter: Michael McCandless
>            Assignee: Simon Willnauer
>             Fix For: 4.1, 5.0
>
>         Attachments: LUCENE-4462.patch, LUCENE-4462.patch
>
>
> Spinoff from http://lucene.markmail.org/thread/4li6bbomru35qn7w
> The new TestBagOfPostings failed the build because it timed out after 2 hours ... but
in digging I found that it was a starvation issue: the 4 threads were flushing segments much
faster than the 1 thread could publish them.
> I think this is because publishing segments (DocumentsWriter.publishFlushedSegment) is
actually rather costly (creates CFS file if necessary, writes .si, etc.).
> I committed a workaround for now, to prevent starvation (see svn diff -c 1394704 https://svn.apache.org/repos/asf/lucene/dev/trunk),
but we really should address the root cause by moving these costly ops into flush() so that
publishing is a low cost operation.

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