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https://issues.apache.org/jira/browse/LUCENE-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846872#action_12846872
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Michael McCandless commented on LUCENE-2328:
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I like this idea!
But, we don't want to simply sync all new files. When IW commits,
it's possibly a subset of all new files. EG running merges (or any
still-open files) should not be sync'd.
Not necessarily all closed files should be sync'd either -- eg any
files that were opened & closed while we were syncing (since syncing
can take some time) should not then be sync'd.
Maybe we change Dir.sync to take a Collection<String>?
Then dir would be the one place that keeps track of what's already
been sync'd and what hasn't.
Or... I wonder if calling sync on a file that's already been sync'd is
really that wasteful... I mean it's technically a no-op, so it's just
the overhead of a no-op system call from way up in javaland.
> 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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