boicehuang commented on code in PR #13306:
URL: https://github.com/apache/lucene/pull/13306#discussion_r1584475381


##########
lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java:
##########
@@ -628,7 +632,7 @@ private class LeafCache implements Accountable {
 
     LeafCache(Object key) {
       this.key = key;
-      cache = new IdentityHashMap<>();
+      cache = Collections.synchronizedMap(new IdentityHashMap<>());

Review Comment:
   Sorry, I misunderstood before. Since there is a read lock, concurrent access 
to IdentityHashMap does not require additional synchronized lock. I optimized 
the code as per your suggestion.



##########
lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java:
##########
@@ -628,7 +632,7 @@ private class LeafCache implements Accountable {
 
     LeafCache(Object key) {
       this.key = key;
-      cache = new IdentityHashMap<>();
+      cache = Collections.synchronizedMap(new IdentityHashMap<>());

Review Comment:
   Sorry, I misunderstood here before. Since there is a read lock, concurrent 
access to IdentityHashMap does not require additional synchronized lock. I 
optimized the code as per your suggestion.



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