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https://issues.apache.org/jira/browse/LUCENE-5148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13747538#comment-13747538
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Robert Muir commented on LUCENE-5148:
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and FieldCache should be consistent as well.
> SortedSetDocValues caching / state
> ----------------------------------
>
> Key: LUCENE-5148
> URL: https://issues.apache.org/jira/browse/LUCENE-5148
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-5148.patch
>
>
> I just spent some time digging into a bug which was due to the fact that
> SORTED_SET doc values are stateful (setDocument/nextOrd) and are cached per
> thread. So if you try to get two instances from the same field in the same
> thread, you will actually get the same instance and won't be able to iterate
> over ords of two documents in parallel.
> This is not necessarily a bug, this behavior can be documented, but I think
> it would be nice if the API could prevent from such mistakes by storing the
> state in a separate object or cloning the SortedSetDocValues object in
> SegmentCoreReaders.getSortedSetDocValues?
> What do you think?
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