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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2328) IndexWriter.synced field accumulates data leading to a Memory Leak
Date Fri, 29 Oct 2010 23:53:27 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-2328:
---------------------------------------

    Attachment: LUCENE-2328.patch

Attached patch with a simpler fix for 3.0/2.9.

IndexWriter and IndexReader now pass the synced set to IndexFileDeleter, which in turn removes
files from it once they are deleted.  This means the set can only be as big as the number
of sync'd but not yet deleted files in the index.

> IndexWriter.synced  field accumulates data leading to a Memory Leak
> -------------------------------------------------------------------
>
>                 Key: LUCENE-2328
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2328
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.9.1, 2.9.2, 3.0, 3.0.1
>         Environment: all
>            Reporter: Gregor Kaczor
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-2328.patch, LUCENE-2328.patch, LUCENE-2328.patch, LUCENE-2328.patch,
LUCENE-2328.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> I am running into a strange OutOfMemoryError. My small test application does
> index and delete some few files. This is repeated for 60k times. Optimization
> is run from every 2k times a file is indexed. Index size is 50KB. I did analyze
> the HeapDumpFile and realized that IndexWriter.synced field occupied more than
> half of the heap. That field is a private HashSet without a getter. Its task is
> to hold files which have been synced already.
> There are two calls to addAll and one call to add on synced but no remove or
> clear throughout the lifecycle of the IndexWriter instance.
> According to the Eclipse Memory Analyzer synced contains 32618 entries which
> look like file names "_e065_1.del" or "_e067.cfs"
> The index directory contains 10 files only.
> I guess synced is holding obsolete data 

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