lhotari commented on code in PR #24580:
URL: https://github.com/apache/pulsar/pull/24580#discussion_r2242171398


##########
pulsar-broker/src/main/java/org/apache/pulsar/zookeeper/MaxValueMetadataNodePayloadLenEstimator.java:
##########
@@ -0,0 +1,132 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.zookeeper;
+
+import java.util.HashMap;
+import java.util.List;
+import org.apache.pulsar.common.util.StringSplitter;
+import org.apache.pulsar.metadata.api.GetResult;
+import org.apache.pulsar.metadata.api.MetadataNodePayloadLenEstimator;
+
+public class MaxValueMetadataNodePayloadLenEstimator implements 
MetadataNodePayloadLenEstimator {
+
+    private final HashMap<PathType, Integer> maxLenPerPathType = new 
HashMap<>();
+    private final HashMap<PathType, Integer> maxLenPerListPathType = new 
HashMap<>();

Review Comment:
   > It is not important enough to ensure thread safety for an accurate value, 
so skipped to guarantee the thread safety
   
   In Java, that's not a proper way to handle thread safety. Another thread 
might never "see" the changes made by another thread. In practice this rarely 
happens, but it can happen due to compiler optimizations. That's why such 
patterns should be avoided in general since they lead to non-deterministic and 
inconsistent behavior.



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