Adrien Grand created LUCENE-8027:
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Summary: Do not cache clauses if they might make the query more
than X times slower
Key: LUCENE-8027
URL: https://issues.apache.org/jira/browse/LUCENE-8027
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
Priority: Minor
Query caching can have a negative impact on tail latencies as the clause that
is cached needs to be entirely consumed. Maybe we could leverage the fact that
we can know the lead cost from any scorer now (LUCENE-7897) in order to
implement heuristics that would look like "do not cache clause X if its cost
is 10x greater than the cost of the entire query". This would make sure that a
fast query can not become absurdly slow just because it had to cache a costly
filter. The filter will need to wait for a more costly query to be cached, or
might never be cached at all.
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