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https://issues.apache.org/jira/browse/SOLR-11891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16338183#comment-16338183
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David Smiley commented on SOLR-11891:
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BTW there very well may be a bug in Solr related to this; I just doubt that
it's in DocStreamer.convertLuceneDocToSolrDoc. I did some basic debugging of
this on master with a small modification to
SolrExampleBinaryTest.testExampleConfig just now and I don't see a problem. I
also set a break point where the lazy loaded value is loaded and I only saw it
occur in a couple tests in those in SolrExampleTests -- one of them was
testChildDoctransformer which doesn't surprise me. I'm using master (roughly
same as 7x). There have been some changes since 6x I recall.
> 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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