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https://issues.apache.org/jira/browse/LUCENE-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12663903#action_12663903
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Jason Rutherglen commented on LUCENE-1476:
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I think it should be up to the user. If the user concurrently
modifies then they're responsible for the possibly spurious effects.
However if we want to be protective, a philosophy I don't think works
well in LUCEN-1516 either, we can offer IR.getDeletedDocs only from a
read only index reader. This solves the issues brought up such as
"undesirable synchronization".

> 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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