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https://issues.apache.org/jira/browse/LUCENE-821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12477759
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Michael McCandless commented on LUCENE-821:
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> The reason is predictability... since you don't know what queries are coming,
> you don't know when that descriptor will be closed, and hence need to plan
> for the upper bound on descriptor usage anyway.
Agreed, the upper bound is what counts here, so it's not much help to reduce by
one at some random later time.
> single norm file still uses up descriptors
> ------------------------------------------
>
> Key: LUCENE-821
> URL: https://issues.apache.org/jira/browse/LUCENE-821
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Yonik Seeley
> Assigned To: Yonik Seeley
> Attachments: norms.patch
>
>
> The new index file format with a single .nrm file for all norms does not
> decrease file descriptor usage.
> The .nrm file is opened once for each field with norms in the index segment.
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