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https://issues.apache.org/jira/browse/LUCENE-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846899#action_12846899
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Earwin Burrfoot commented on LUCENE-2328:
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I'm proposing something even more dead simple.
1. We remove Directory.sync(String) completely.
2. Each time you call IndexOutput.close(), Dir adds this file to its internal
set (if it cares about it at all).
3. If you call Directory.delete(), it also removes file from the set (though
not strictly necessary).
4. When you commit at IW, it calls Directory.sync() and everything in its
internal set gets synced.
> 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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