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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2720) IndexWriter should throw IndexFormatTooOldExc on open, not later during optimize/getReader/close
Date Sat, 23 Oct 2010 10:04:19 GMT
IndexWriter should throw IndexFormatTooOldExc on open, not later during optimize/getReader/close
------------------------------------------------------------------------------------------------

                 Key: LUCENE-2720
                 URL: https://issues.apache.org/jira/browse/LUCENE-2720
             Project: Lucene - Java
          Issue Type: Bug
          Components: Index
            Reporter: Michael McCandless
             Fix For: 3.1, 4.0


Spinoff of LUCENE-2618 and also related to the original issue LUCENE-2523...

If you open IW on a too-old index, you don't find out until much later that the index is too
old.

This is because IW does not go and open segment readers on all segments.  It only does so
when it's time to apply deletes, do merges, open an NRT reader, etc.

This is a serious bug because you can in fact succeed in committing with the new major version
of Lucene against your too-old index, which is catastrophic because suddenly the old Lucene
version will no longer open the index, and so your index becomes unusable.

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