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Date: Wed, 10 Oct 2012 07:43:03 +0000 (UTC)
From: "Simon Willnauer (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Updated] (LUCENE-4462) Publishing flushed segments is
 single threaded and too costly
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     [ https://issues.apache.org/jira/browse/LUCENE-4462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Attachment: LUCENE-4462.patch

here is a new patch adding back the safety forcePurge. I will commit this to trunk and let it bake in a bit before I backport. I will keep this issue open until it's ported.
                
> 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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