[jira] [Created] (LUCENE-5148) SortedSetDocValues caching / state

["Adrien Grand (JIRA)" <ji...@apache.org>]

Adrien Grand created LUCENE-5148:
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             Summary: SortedSetDocValues caching / state
                 Key: LUCENE-5148
                 URL: https://issues.apache.org/jira/browse/LUCENE-5148
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Priority: Minor


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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