[LUCENE-756] Maintain norms in a single file .nrm

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.1
• Component/s: core/index
• Lucene Fields: Patch Available
• Assignee: Doron Cohen
• Reporter: Doron Cohen
• Created: 21/Dec/06 02:10
• Updated: 28/Aug/22 11:33
• Resolved: 16/Jan/07 20:28

Description

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).