[jira] [Updated] (SOLR-7730) speed-up faceting on doc values fields

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

     [ https://issues.apache.org/jira/browse/SOLR-7730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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