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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2328) IndexWriter.synced field accumulates data leading to a Memory Leak
Date Thu, 18 Mar 2010 18:26:28 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12847050#action_12847050
] 

Michael McCandless commented on LUCENE-2328:
--------------------------------------------

In the current proposal, IndexOutput won't call dir.sync.  All it will do is notify the dir
when it was closed so the dir will record that filename as "eligible for commit".

Lucene today never syncs a file until after it's closed, but, conceivably some day it could.
 Or others who use the Dir API to write their own files could.

At the OS level this is perfectly fine (in fact you have to pass an open fd to fsync).  It
seems presumptuous of the directory to silently ignore a call to sync just because the file
hadn't been closed yet...

> 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
>            Priority: Minor
>             Fix For: 3.1
>
>   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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