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https://issues.apache.org/jira/browse/LUCENE-2815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972258#action_12972258
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Yonik Seeley commented on LUCENE-2815:
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bq. It looks like MultiReaderBits also has issues with safe object publication.
Actually, it looks like this one is OK with most of our current code.
SegmentReader.getDeletedDocs() returns an object stored in a volatile, so that
counts as a safe publish. Other implementations seem to either throw an
exception or directly call a segment reader. One exception is instantiated
index (I think).
We can't call getDeletedDocs() just once up-front, because an IndexReader may
still be used to delete documents.
> MultiFields not thread safe
> ---------------------------
>
> Key: LUCENE-2815
> URL: https://issues.apache.org/jira/browse/LUCENE-2815
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Yonik Seeley
> Fix For: 4.0
>
>
> MultiFields looks like it has thread safety issues
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