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https://issues.apache.org/jira/browse/LUCENE-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528889#comment-13528889
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Michael McCandless commented on LUCENE-4598:
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Got a nice ~5-6% bump in the nightly facet perf from this fix:
http://people.apache.org/~mikemccand/lucenebench/TermDateFacets.html
I added an annotation.
> Change PayloadIterator to not use top-level reader API
> ------------------------------------------------------
>
> Key: LUCENE-4598
> URL: https://issues.apache.org/jira/browse/LUCENE-4598
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Michael McCandless
> Assignee: Shai Erera
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4598.patch, LUCENE-4598.patch, LUCENE-4598.patch
>
>
> Currently the facet module uses MultiFields.* to pull the D&PEnum in
> PayloadIterator, to access the payloads that store the facet ords.
> It then makes heavy use of .advance and .getPayload to visit all docIDs in
> the result set.
> I think we should get some speedup if we go segment by segment instead ...
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