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From "Doron Cohen (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-756) Maintain norms in a single file .nrm
Date Thu, 21 Dec 2006 02:11:21 GMT
Maintain norms in a single file .nrm
------------------------------------

                 Key: LUCENE-756
                 URL: http://issues.apache.org/jira/browse/LUCENE-756
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Doron Cohen
            Priority: Minor


Non-compound indexes are ~10% faster at indexing, and perform 50% IO activity comparing to
compound indexes. But their file descriptors foot print is much higher. 

By maintaining all field norms in a single .nrm file, we can bound the number of files used
by non compound indexes, and possibly allow more applications to use this format.

More details on the motivation for this in: http://www.nabble.com/potential-indexing-perormance-improvement-for-compound-index---cut-IO---have-more-files-though-tf2826909.html
(in particular http://www.nabble.com/Re%3A-potential-indexing-perormance-improvement-for-compound-index---cut-IO---have-more-files-though-p7910403.html).


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