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https://issues.apache.org/jira/browse/LUCENE-1314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662043#action_12662043
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Jason Rutherglen commented on LUCENE-1314:
------------------------------------------
I executed on Eclipse Mac OS X on a 4 core box (core's significant due to the
threads). I ran TestIndexReaderReopen.testThreadSafety 2 times in debug mode
it worked, thought that debug mode wasn't making the bug reproduce so tried
just running the test and it passed again. The 5th time it gave an error in
debug mode. The test case fails consistently when SegmentReader.reopenSegment
success == false and decRef is called afterwards in the finally clause. It
seems that calling this decRef on the newly cloned object is causing the
assertion error which is possibly related to threading. Probably because the
decRef on the failed clone is decrementing one too many times on a
deletedDocsRef used by another reader and causing the following assertion
error. I'm not sure if this is a real bug or an issue that the test case
should ignore.
{code}
java.lang.AssertionError
at
org.apache.lucene.index.SegmentReader$Ref.decRef(SegmentReader.java:104)
at org.apache.lucene.index.SegmentReader.decRef(SegmentReader.java:249)
at
org.apache.lucene.index.MultiSegmentReader.doClose(MultiSegmentReader.java:413)
at org.apache.lucene.index.IndexReader.decRef(IndexReader.java:157)
at org.apache.lucene.index.IndexReader.close(IndexReader.java:990)
at
org.apache.lucene.index.TestIndexReaderReopen$9.run(TestIndexReaderReopen.java:703)
at
org.apache.lucene.index.TestIndexReaderReopen$ReaderThread.run(TestIndexReaderReopen.java:818)
{code}
> IndexReader.clone
> -----------------
>
> Key: LUCENE-1314
> URL: https://issues.apache.org/jira/browse/LUCENE-1314
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Affects Versions: 2.3.1
> Reporter: Jason Rutherglen
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch,
> LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch,
> LUCENE-1314.patch, LUCENE-1314.patch, lucene-1314.patch, lucene-1314.patch,
> lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, lucene-1314.patch,
> lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, lucene-1314.patch,
> lucene-1314.patch, lucene-1314.patch
>
>
> Based on discussion
> http://www.nabble.com/IndexReader.reopen-issue-td18070256.html. The problem
> is reopen returns the same reader if there are no changes, so if docs are
> deleted from the new reader, they are also reflected in the previous reader
> which is not always desired behavior.
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