[GitHub] [hadoop] ayushtkn commented on a diff in pull request #5349: HDFS-16907. Add LastHeartbeatResponseTime for BP service actor

["ayushtkn (via GitHub)" <gi...@apache.org>]

ayushtkn commented on code in PR #5349:
URL: https://github.com/apache/hadoop/pull/5349#discussion_r1101006902


##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMXBean.java:
##########
@@ -294,4 +296,81 @@ public void testDataNodeMXBeanSlowDisksEnabled() throws Exception {
       if (cluster != null) {cluster.shutdown();}
     }
   }
+
+  @Test
+  public void testDataNodeMXBeanLastHeartbeats() throws Exception {
+    Configuration conf = new Configuration();
+    try (MiniDFSCluster cluster = new MiniDFSCluster
+        .Builder(conf)
+        .nnTopology(MiniDFSNNTopology.simpleHATopology(2))
+        .build()) {
+      cluster.waitActive();
+      cluster.transitionToActive(0);
+      cluster.transitionToStandby(1);
+
+      DataNode datanode = cluster.getDataNodes().get(0);
+
+      MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
+      ObjectName mxbeanName = new ObjectName(
+          "Hadoop:service=DataNode,name=DataNodeInfo");
+

Review Comment:
   This is unused, I thought checkstyle would be catching this. Can you raise an Addendum correcting this.



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