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https://issues.apache.org/jira/browse/LUCENE-1314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-1314:
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Attachment: LUCENE-1314.patch
Attached patch. I plan to commit in a day or two.
OK I changed deletedDocRefs to only be inc/decRef'd once for the
reader, not every time the reader is inc/decRef'd (which was causing
the bug you saw).
But then because of how a reopened SegmentReader references the
original, the deleted docs were being unecessarily copy-on-write'd (on
closing the first reader we would fail to decref the deletedDocsRef so
when the 2nd reader did a delete, it would copy).
So then I added a new coreRef to SegmentReader, instead of the
referencedSegmengReader. I like this approach better because it
allows the original reader to be closed, without closing the core
objects when other readers share them.
It also simplifies SegmentReader's inc/decRef so that they no longer
need to be overridden.
Also, when cloning the BitVector, I changed it to not copy count over
-- if a separate thread is changing the deleted docs at the same time,
the count could be off.
Back-compat tests don't pass, because TestIndexReaderReopen is
checking internal reference counts; I'll commit fixes to tests when I
commit.
> 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, 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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