boicehuang commented on code in PR #13306:
URL: https://github.com/apache/lucene/pull/13306#discussion_r1580286445
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lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java:
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@@ -265,7 +269,6 @@ boolean requiresEviction() {
}
CacheAndCount get(Query key, IndexReader.CacheHelper cacheHelper) {
- assert lock.isHeldByCurrentThread();
assert key instanceof BoostQuery == false;
assert key instanceof ConstantScoreQuery == false;
final IndexReader.CacheKey readerKey = cacheHelper.getKey();
Review Comment:
Yes, So I want to try my best to optimize this neck. I think `uniqueQueries`
should be `Collections.synchronizedMap` to achieve LRU expiration, but `cache`
does not need order and can be `ConcurrentHashMap` to improve performance.
doc count | field cardinality | query point | baseline QPS | candidate QPS |
diff percentage | diff
-- | -- | -- | -- | -- | -- | --
30000000 | 10 | 1 | 2481 | 5102 | 105.6% |
30000000 | 10 | 1 | 2481 | 4843 | 95.2% | using `LongAdder `
30000000 | 10 | 1 | 2481 | 3751 | 51%| `uniqueQueries` and `cache` to be
`Collections.synchronizedMap`. using `LongAdder `
30000000 | 10 | 1 | 2481 | 4571 | 84% | `uniqueQueries` to
be`Collections.synchronizedMap` , `cache` to be`ConcurrentHashMap`. using
`LongAdder `
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