Will Currie created SOLR-12407:
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Summary: edismax boost performance regression from deprecating
BoostedQuery
Key: SOLR-12407
URL: https://issues.apache.org/jira/browse/SOLR-12407
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 7.3
Reporter: Will Currie
Attachments: restore-boosted-query.patch
I'm seeing ~50% increase in query response time after upgrading from 7.2 to 7.3
(600ms to 900ms). My queries use an edismax boost something like:
{noformat}
if(termfreq(type,"A"),product(map(field1,3,3,1.5,1),map(field1,4,4,1.9,1),if(def(field2,false),product(map(field1,1,1,0.6,1),map(field1,2,2,0.7,1),if(not(exists(field1)),0.6,1),map(field3,0,0,1.3,1)),product(map(field1,1,1,0.7,1),map(field1,2,2,1.1,1),if(not(exists(field1)),0.90,1),map(field3,0,0,1.50,1)))),1){noformat}
This boost is likely (surely?) suboptimal but LUCENE-8099 appears to have
introduced this performance regression (poured proverbial oil on my smouldering
fire). If I change ExtendedDismaxQParser back to using the deprecated
BoostedQuery I get the 600ms solr 7.2 response time back.
It appears FunctionScoreQuery invokes the boost function twice for each
document. Once with a call to
[exists()|https://github.com/apache/lucene-solr/blob/03afeb7766a39996de3c85e8a6ab24d2a352dd1c/lucene/queries/src/java/org/apache/lucene/queries/function/ValueSource.java#L150]
from
[advanceExact()|https://github.com/apache/lucene-solr/blob/42154387d4f2a6060da09c4236e2a8dbb575c59e/lucene/queries/src/java/org/apache/lucene/queries/function/FunctionScoreQuery.java#L170],
then a second time from the call chain following scores.doubleValue().
I don't know if that's the cause of the slowdown but I'm definitely seeing a
slowdown that disappears when I revert part of LUCENE-8099.
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