[jira] [Assigned] (LUCENE-6325) improve perf and memory of FieldInfos.fieldInfo(int)

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-6325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless reassigned LUCENE-6325:
------------------------------------------

    Assignee: Michael McCandless

OK I can try to update this & commit...

> improve perf and memory of FieldInfos.fieldInfo(int)
> ----------------------------------------------------
>
>                 Key: LUCENE-6325
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6325
>             Project: Lucene - Core
>          Issue Type: Sub-task
>            Reporter: Robert Muir
>            Assignee: Michael McCandless
>             Fix For: 5.2, Trunk
>
>         Attachments: LUCENE-6325.patch
>
>
> FieldInfos.fieldInfo(int) looks up a field by number and returns its FieldInfo.
> This method is called per-field-per-doc in things like stored fields and vectors readers.
> Unfortunately, today this method is always backed by a TreeMap. In most cases a simple array is better, its faster and uses less memory.
> These changes made significant difference in stored fields checkindex time with my test index (had only 10 fields). Maybe it helps merge as well.



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