[jira] Updated: (LUCENE-756) Maintain norms in a single file .nrm

["Doron Cohen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Doron Cohen updated LUCENE-756:
-------------------------------

    Attachment: nrm.patch.3.txt

> Maintain norms in a single file .nrm
> ------------------------------------
>
>                 Key: LUCENE-756
>                 URL: https://issues.apache.org/jira/browse/LUCENE-756
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Doron Cohen
>         Assigned To: Doron Cohen
>            Priority: Minor
>         Attachments: nrm.patch.2.txt, nrm.patch.3.txt, 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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