benwtrent commented on code in PR #13306:
URL: https://github.com/apache/lucene/pull/13306#discussion_r1579341971


##########
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:
   How do you suggest that we achieve the "LRU" aspect of this cache without 
knowing the queries that were used most recently?
   
   The point of the linked hashmap is that it orders by last access. We need 
something like this to achieve LRU expiration 



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