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https://issues.apache.org/jira/browse/LUCENE-6325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14603012#comment-14603012
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Michael McCandless commented on LUCENE-6325:
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I think the patch is ready...
> 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, 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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