Adrien Grand created LUCENE-4080:
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Summary: SegmentReader.numDeletedDocs() sometimes gives an
incorrect numDeletedDocs
Key: LUCENE-4080
URL: https://issues.apache.org/jira/browse/LUCENE-4080
Project: Lucene - Java
Issue Type: Bug
Components: core/index
Affects Versions: 4.0, 4.1
Reporter: Adrien Grand
Priority: Trivial
Fix For: 4.1
At merge time, SegmentReader sometimes gives an incorrect value for
numDeletedDocs.
>From LUCENE-2357:
bq. As far as I know, [SegmenterReader.numDeletedDocs() is] only unreliable in
this context (SegmentReader passed to SegmentMerger for merging); this is
because we allow newly marked deleted docs to happen concurrently up until the
moment we need to pass the SR instance to the merger (search for "// Must sync
to ensure BufferedDeletesStream" in IndexWriter.java) ... but it would be nice
to fix that, so I think open a new issue (it won't block this one)? We should
be able to make a new SR instance, sharing the same core as the current one but
using the correct delCount...
bq. It would be cleaner (but I think hairier) to create a new SR for merging
that holds the correct delCount, but let's do that under the separate issue.
bq. it would be best if the SegmentReader's numDeletedDocs were always
correct, but, fixing that in IndexWriter is somewhat tricky. Ie, the fix could
be hairy but the end result ("SegmentReader.numDeletedDocs can always be
trusted") would be cleaner...
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