Technoboy- commented on a change in pull request #3748:
URL: 
https://github.com/apache/incubator-dolphinscheduler/pull/3748#discussion_r489879084



##########
File path: 
dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/worker/cache/ResponceCache.java
##########
@@ -0,0 +1,68 @@
+/*
+ * 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.dolphinscheduler.server.worker.cache;
+
+import org.apache.dolphinscheduler.common.enums.Event;
+import org.apache.dolphinscheduler.remote.command.Command;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class ResponceCache {
+
+    private static final ResponceCache instance = new ResponceCache();
+
+    private ResponceCache(){}
+
+    public static ResponceCache get(){
+        return instance;
+    }
+
+    private Map<Integer,Command> ackCache = new ConcurrentHashMap<>();
+    private Map<Integer,Command> responseCache = new ConcurrentHashMap<>();
+
+
+    public void cache(Integer taskInstanceId, Command command, Event event){

Review comment:
       For the class Name XXXCache.  




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