wei wang created SOLR-11891:
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Summary: 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: 6.6.2, 6.4.2, 5.4
Reporter: wei wang
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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