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https://issues.apache.org/jira/browse/SOLR-11891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341547#comment-16341547
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David Smiley commented on SOLR-11891:
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bq. Is there any performance implications to enable docValues for the uniqueKey
field, i.e retrieve via docValues vs stored field?
Good ones :-) Retrieval should be much faster. You'd have to re-index
changing the schema in such a way. And there is some extra storage for
docValues of any field... but in the scheme of things it's not a big deal. The
optimization I'm referring to is SOLR-8344 which landed in 7.1. The "id" field
in the default configset ought to be docValues but it is not... I ought to file
a JIRA for it.
> BinaryResponseWriter fetches unnecessary fields
> -----------------------------------------------
>
> Key: SOLR-11891
> URL: https://issues.apache.org/jira/browse/SOLR-11891
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Response Writers
> Affects Versions: 5.4, 6.4.2, 6.6.2
> Reporter: wei wang
> Priority: Major
>
> We observe that solr query time increases significantly with the number of
> rows requested, even all we retrieve for each document is just fl=id,score.
> Debugged a bit and see that most of the increased time was spent in
> BinaryResponseWriter, converting lucene document into SolrDocument. Inside
> convertLuceneDocToSolrDoc():
> [https://github.com/apache/lucene-solr/blob/df874432b9a17b547acb24a01d3491839e6a6b69/solr/core/src/java/org/apache/solr/response/DocsStreamer.java#L182]
>
> I am a bit puzzled why we need to iterate through all the fields in the
> document. Why can’t we just iterate through the requested field list?
> [https://github.com/apache/lucene-solr/blob/df874432b9a17b547acb24a01d3491839e6a6b69/solr/core/src/java/org/apache/solr/response/DocsStreamer.java#L156]
>
> e.g. when pass in the field list as
> sdoc = convertLuceneDocToSolrDoc(doc, rctx.getSearcher().getSchema(), fnames)
> and just iterate through fnames, there is a significant performance boost in
> our case.
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