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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-2762) Don't leak deleted open file handles with pooled readers
Date Tue, 24 May 2011 15:32:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038629#comment-13038629
] 

Michael McCandless commented on LUCENE-2762:
--------------------------------------------

Hmmm... the fix here was backported to 3.0.x, so it should be fixed in 3.0.3.

The code fragment looks correct, but your usage of decRef (not close) likely means you have
other places that also incRef the reader?  Are you sure all incRefs are balanced by a decRef?

Are you sure you really have leaking file handles and not just too many open files?  EG what
mergeFactor are you using...?

> Don't leak deleted open file handles with pooled readers
> --------------------------------------------------------
>
>                 Key: LUCENE-2762
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2762
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.9.4, 3.0.3, 3.1, 4.0
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 2.9.4, 3.0.3, 3.1, 4.0
>
>         Attachments: LUCENE-2762.patch
>
>
> If you have CFS enabled today, and pooling is enabled (either directly
> or because you've pulled an NRT reader), IndexWriter will hold open
> SegmentReaders against the non-CFS format of each merged segment.
> So even if you close all NRT readers you've pulled from the writer,
> you'll still see file handles open against files that have been
> deleted.
> This count will not grow unbounded, since it's limited by the number
> of segments in the index, but it's still a serious problem since the
> app had turned off CFS in the first place presumably to avoid risk of
> too-many-open-files.  It's also bad because it ties up disk space
> since these files would otherwise be deleted.

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