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https://issues.apache.org/jira/browse/LUCENE-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169509#comment-13169509
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Michael McCandless commented on LUCENE-3646:
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+1, looks great. Nice how few places required SlowMR wrapping....
> throw exception for fieldcache on a non-atomic reader
> -----------------------------------------------------
>
> Key: LUCENE-3646
> URL: https://issues.apache.org/jira/browse/LUCENE-3646
> Project: Lucene - Java
> Issue Type: Task
> Reporter: Robert Muir
> Fix For: 4.0
>
> Attachments: LUCENE-3646.patch
>
>
> In Lucene 4.0, we go through a lot of effort to prevent slow uses of
> non-atomic readers:
> DirectoryReader/MultiReader etc throw exception if you don't try to access
> postings or docvalues apis per-segment, etc.
> But the biggest trap of all is still too easy to fall into, we don't do the
> same for FieldCache.
> I think we should throw exception, forcing the user to either change their
> code or use a SlowMultiReaderWrapper.
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