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https://issues.apache.org/jira/browse/LUCENE-3829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218542#comment-13218542
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Simon Willnauer commented on LUCENE-3829:
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wait, I think your test is wrong. DV consumer should pull a source directly
from DV per thread. An instance is not threadsafe per-se. if you pull an
"in-memory" source you can simply share it but the interface doesn't guarantee
this. you can simply pull the "in-memory" source in each thread and you get the
same instance since it is cached. The same is true for the on-disk source since
it is not cached. I clone the IndexInput in getDirectSource() to prevent this
problem.
> Lucene40 codec's DocValues DirectSource impls aren't thread-safe
> ----------------------------------------------------------------
>
> Key: LUCENE-3829
> URL: https://issues.apache.org/jira/browse/LUCENE-3829
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-3829.patch
>
>
> Our DirectSource impls hold IndexInput(s) open against the dat/idx
> files, which we then seek + read when loading a specific document's
> value. But this is in no way protected against multiple threads
> I think...?
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