I thought I'd post some good news about MMapDirectory as
the comments in the release notes are quite downbeat about
its performance. In some environments MMapDirectory
provides a big improvement.
Our test application is an index of 11.4 million
documents which are derived from MARC (bibliographic
Try IndexReader static method indexExists:
http://lucene.apache.org/java/docs/api/org/apache/lucene/index/IndexReader.html#indexExists(java.lang.String)
Kent Fitch
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