boicehuang commented on code in PR #13306:
URL: https://github.com/apache/lucene/pull/13306#discussion_r1579458103
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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:
I understand your point. I try to use `Collections.synchronizedMap` and get
the benchmark results as follows
doc count | field cardinality | query point | baseline QPS | candidate QPS |
diff percentage
-- | -- | -- | -- | -- | --
30000000 | 10 | 1 | 2481 | 5102 | 105.6%
30000000 | 10 | 1 | 2481 | 4843 | 95.2% (using `LongAdder `)
30000000 | 10 | 1 | 2481 | 3851 | 55% (using `LongAdder ` And
`ConcurrentHashMap`)
30000000 | 10 | 1 | 2481 | 3751 | 51% (using `LongAdder ` And
`Collections.synchronizedMap`)
It seems that performance still can be improved if the locking time is
minimized.
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