slfan1989 commented on code in PR #5326:
URL: https://github.com/apache/hadoop/pull/5326#discussion_r1088613766


##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/test/java/org/apache/hadoop/yarn/server/router/cleaner/TestSubClusterCleaner.java:
##########
@@ -0,0 +1,77 @@
+/**
+ * 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.yarn.server.router.cleaner;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.exceptions.YarnException;
+import 
org.apache.hadoop.yarn.server.federation.store.impl.MemoryFederationStateStore;
+import org.apache.hadoop.yarn.server.federation.store.records.SubClusterId;
+import org.apache.hadoop.yarn.server.federation.store.records.SubClusterInfo;
+import 
org.apache.hadoop.yarn.server.federation.store.records.SubClusterRegisterRequest;
+import org.apache.hadoop.yarn.server.federation.store.records.SubClusterState;
+import 
org.apache.hadoop.yarn.server.federation.utils.FederationStateStoreFacade;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Map;
+
+public class TestSubClusterCleaner {
+
+  ////////////////////////////////
+  // Router Constants
+  ////////////////////////////////
+  private Configuration conf;
+  private MemoryFederationStateStore stateStore;
+  private FederationStateStoreFacade facade;
+  private SubClusterCleaner cleaner;
+
+  @Before
+  public void setup() throws YarnException {
+    conf = new YarnConfiguration();
+    conf.setLong(YarnConfiguration.ROUTER_SUBCLUSTER_EXPIRATION_TIME, 1000);
+    conf.setInt(YarnConfiguration.FEDERATION_CACHE_TIME_TO_LIVE_SECS, 0);
+
+    stateStore = new MemoryFederationStateStore();
+    stateStore.init(conf);
+
+    facade = FederationStateStoreFacade.getInstance();
+    facade.reinitialize(stateStore, conf);
+
+    cleaner = new SubClusterCleaner(conf);
+    for (int i = 0; i < 4; i++){
+      // Create sub cluster id and info
+      SubClusterId subClusterId = SubClusterId.newInstance("SC-" + i);
+      SubClusterInfo subClusterInfo = SubClusterInfo.newInstance(subClusterId,
+          "127.0.0.1:1", "127.0.0.1:2", "127.0.0.1:3", "127.0.0.1:4",
+           SubClusterState.SC_RUNNING, System.currentTimeMillis(), "");
+      // Register the subCluster
+      stateStore.registerSubCluster(
+          SubClusterRegisterRequest.newInstance(subClusterInfo));
+    }
+  }
+
+  @Test
+  public void testSubClusterRegisterHeartBeatTime() throws YarnException, 
InterruptedException {
+    Thread.sleep(1000);

Review Comment:
   Thank you very much for helping to review the code!
   
   For this unit test, we build a cluster with 4 subClusters whose initial 
state is `RUNNING`.
   
   TestSubClusterCleaner#setup#Line 58
   ```
   for (int i = 0; i < 4; i++){
         // Create sub cluster id and info
         SubClusterId subClusterId = SubClusterId.newInstance("SC-" + i);
         SubClusterInfo subClusterInfo = 
SubClusterInfo.newInstance(subClusterId,
             "127.0.0.1:1", "127.0.0.1:2", "127.0.0.1:3", "127.0.0.1:4",
              SubClusterState.SC_RUNNING, System.currentTimeMillis(), "");
         // Register the subCluster
         stateStore.registerSubCluster(
             SubClusterRegisterRequest.newInstance(subClusterInfo));
       }
   ```
   
   We set a timeout of 1 second
   TestSubClusterCleaner#setup#Line 48
   ```
   conf = new YarnConfiguration();
   conf.setLong(YarnConfiguration.ROUTER_SUBCLUSTER_EXPIRATION_TIME, 1000);
   ```
   
   In this unit test, we first sleep for `1s`, so that all subclusters will 
timeout, we execute `SubClusterCleaner#run`, it will help set all subclusters 
to `SC_LOST`.
   



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