szetszwo commented on code in PR #5853:
URL: https://github.com/apache/ozone/pull/5853#discussion_r1435266670


##########
hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/resource/LeakTracker.java:
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@@ -0,0 +1,50 @@
+/*
+ * 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.hadoop.hdds.resource;
+
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.WeakReference;
+import java.util.Set;
+
+/**
+ * A token to track resource closure.
+ *
+ * @see LeakDetector
+ */
+public class LeakTracker extends WeakReference<Object> {

Review Comment:
   Use generic type instead of `Object` and implement `AutoCloseable`, i.e.
   ```java
   public class LeakTracker<T> extends WeakReference<T> implements 
AutoCloseable {
   ```



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