lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Doron Cohen (JIRA)" <>
Subject [jira] Updated: (LUCENE-756) Maintain norms in a single file .nrm
Date Thu, 21 Dec 2006 02:15:22 GMT
     [ ]

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:
>             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:
(in particular

This message is automatically generated by JIRA.
If you think it was sent incorrectly contact one of the administrators:
For more information on JIRA, see:


To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message