Ivan Provalov created SOLR-9942:
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Summary: MoreLikeThis Performance Degraded With Filtered Query
Key: SOLR-9942
URL: https://issues.apache.org/jira/browse/SOLR-9942
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: MoreLikeThis
Affects Versions: 5.5.2
Reporter: Ivan Provalov
Without any filters, the MLT is performing normal. With any added filters, the
performance degrades (2.5-3.0X in our case). The issue goes away with 6.0
upgrade. The hot method is Lucene's DisiPriorityQueue downHeap(), which takes
5X more calls in 5.5.2 compared to 6.0. I am guessing that some of the Solr
filters refactoring fixed it for 6.0 release.
As a work-around, for now I just refactored the custom MLT handler to convert
the filters into boolean clauses, which takes care of the issue.
Our configuration:
1. mlt.maxqt=100
2. There is an additional filter passed as a parameter
3. <field name="some_mlt" type="text_en" indexed="true" stored="true"
multiValued="true" omitNorms="false" termVectors="true"/>
4. text_en is a pretty standard text fieldType.
I have a code to populate a test dataset and run a query in order to reproduce
this.
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