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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2120) Possible file handle leak in near real-time reader
Date Mon, 28 Dec 2009 14:47:29 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794819#action_12794819
] 

Michael McCandless commented on LUCENE-2120:
--------------------------------------------

Thanks for running that test John.  You should probably add something
inside the if bodies, eg increment a count, to make sure the compiler
doesn't optimize it away.  (And print the count in the end to make
sure it's identical for the two methods).

I had done a similar test in LUCENE-1476, where I hacked
SegmentTermDocs to represent deleted docs as list-of-int-docIDs, and
then "iterate" through them, but found only a tiny perf. gain at <= 1%
deleted docs.  Not sure why I didn't see a bigger gain... I would
expect at low rates to see gains.

And the perf. loss at even moderate deletion rates is what inspired
opening LUCENE-1536, to explore applying filters the same way we apply
deleted docs (ie, switch from iterator to random access).


> Possible file handle leak in near real-time reader
> --------------------------------------------------
>
>                 Key: LUCENE-2120
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2120
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 3.1
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 3.1
>
>
> Spinoff of LUCENE-1526: Jake/John hit file descriptor exhaustion when testing NRT.
> I've tried to repro this, stress testing NRT, saturating reopens, indexing, searching,
but haven't found any issue.
> Let's try to get to the bottom of it, here...

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