throw exception for fieldcache on a non-atomic reader
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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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