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https://issues.apache.org/jira/browse/LUCENE-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664573#action_12664573
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Jason Rutherglen commented on LUCENE-1476:
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{quote}
If we moved to using only iterator API for accessing deleted docs within Lucene
then we could explore fixes for the copy-on-write cost w/o changing on-disk
representation of deletes. IE tombstones are perhaps overkill for Lucene, since
we're not using the filesystem as the intermediary for communicating deletes to
a reopened reader. We only need an in-RAM incremental solution.
{quote}
+1 Agreed. Good point about not needing to change the on disk representation
as that would make implementation a bit more complicated. Sounds like we need
a tombstones patch as well that plays well with IndexReader.clone.
Exposing deleted docs as a DocIdSet allows possible future implementations that
DO return deleted docs as discussed (via a flag to IndexReader) from TermDocs.
Deleted docs DocIdSet can then be used on a higher level as a filter/query.
> BitVector implement DocIdSet
> ----------------------------
>
> Key: LUCENE-1476
> URL: https://issues.apache.org/jira/browse/LUCENE-1476
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.4
> Reporter: Jason Rutherglen
> Priority: Trivial
> Attachments: LUCENE-1476.patch, quasi_iterator_deletions.diff
>
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> BitVector can implement DocIdSet. This is for making
> SegmentReader.deletedDocs pluggable.
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