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https://issues.apache.org/jira/browse/SOLR-7730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuriy updated SOLR-7730:
------------------------
Attachment: LUCENE-7730.patch
It is possible that first segment has no docs with field "A" but second segment
has such docs. Invocation of reader.getFieldInfos().fieldInfo(field) on first
segment will return null and call of getDocValuesType() will cause npe.
> speed-up faceting on doc values fields
> --------------------------------------
>
> Key: SOLR-7730
> URL: https://issues.apache.org/jira/browse/SOLR-7730
> Project: Solr
> Issue Type: Improvement
> Components: faceting
> Affects Versions: 5.2.1
> Reporter: Mikhail Khludnev
> Labels: patch
> Fix For: 5.3
>
> Attachments: LUCENE-7730.patch, LUCENE-7730.patch
>
>
> every time we count facets on DocValues fields in Solr on many segments index
> we see the unnecessary hotspot:
> {code}
> ....
> at
> org.apache.lucene.index.MultiFields.getMergedFieldInfos(MultiFields.java:248)
> at
> org.apache.lucene.index.SlowCompositeReaderWrapper.getFieldInfos(SlowCompositeReaderWrapper.java:239)
> at
> org.apache.lucene.index.SlowCompositeReaderWrapper.getSortedSetDocValues(SlowCompositeReaderWrapper.java:176)
> at
> org.apache.solr.request.DocValuesFacets.getCounts(DocValuesFacets.java:72)
> at
> org.apache.solr.request.SimpleFacets.getTermCounts(SimpleFacets.java:460) ....
> {code}
> the reason is SlowCompositeReaderWrapper.getSortedSetDocValues() Line 136 and
> SlowCompositeReaderWrapper.getSortedDocValues() Line 174
> before return composite doc values, SCWR merges segment field infos, which is
> expensive, but after fieldinfo is merged, it checks *only* docvalue type in
> it. This dv type check can be done much easier in per segment basis.
> This patch gets some performance gain for those who count DV facets in Solr.
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