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Posted to dev@lucene.apache.org by "Doron Cohen (JIRA)" <ji...@apache.org> on 2006/12/21 03:15:22 UTC
[jira] Updated: (LUCENE-756) Maintain norms in a single file .nrm
[ http://issues.apache.org/jira/browse/LUCENE-756?page=all ]
Doron Cohen updated LUCENE-756:
-------------------------------
Attachment: nrm.patch.txt
Attached patch - nrm.patch.txt - modifies field norms maintenance to a single .nrm file.
Modification is backwards compatible - existing indexes with norms in a file per norm are read. - the first merge would create a single .nrm file.
All tests pass.
No performance degtadations were observed as result of this change, but my tests so far were not very extensive.
> 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
> Assigned To: Doron Cohen
> Priority: Minor
> Attachments: nrm.patch.txt
>
>
> 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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