benwtrent commented on code in PR #13306:
URL: https://github.com/apache/lucene/pull/13306#discussion_r1581481128


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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 agree, but IdentityHashMap is not thread-safe.
   
   I may be wrong, but I though if the writing to `IdentityHashMap` was 
protected (which it is via the write lock, which would block the readers), that 
means during read it isn't being mutated, and writes are fully synced. 
Consequently, its perfectly fine to read from multiple threads. 



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