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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2769) FilterIndexReader in trunk does not implement getSequentialSubReaders() correctly
Date Fri, 19 Nov 2010 08:27:13 GMT
FilterIndexReader in trunk does not implement getSequentialSubReaders() correctly
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                 Key: LUCENE-2769
                 URL: https://issues.apache.org/jira/browse/LUCENE-2769
             Project: Lucene - Java
          Issue Type: Bug
    Affects Versions: 4.0
            Reporter: Uwe Schindler


Since LUCENE-2459, getSequentialSubReaders() in FilterIndexReader returns null, so it returns
an atomic reader. But If you call then any of the enum methods, it throws Exception because
the underlying reader is not atomic.

We should move the null-returning method to SlowMultiReaderWrapper and fix FilterIndexReader's
default to return in.getSequentialSubReaders(). Ideally an implementation must of course also
wrap the sub-readers.

If we change this we have to look into other Impls like the MultiPassIndexSplitter if we need
to add atomicity.

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