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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