LeonGao91 commented on a change in pull request #3346:
URL: https://github.com/apache/hadoop/pull/3346#discussion_r698915443



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/NNHAServiceTarget.java
##########
@@ -56,9 +56,25 @@
   private final String nnId;
   private final String nsId;
   private final boolean autoFailoverEnabled;
-  
+
   public NNHAServiceTarget(Configuration conf,
       String nsId, String nnId) {
+    this(conf, nsId, nnId, null, null, null);
+  }
+
+  /**
+   * Create a NNHAServiceTarget for a namenode.
+   *
+   * @param conf          HDFS configuration.
+   * @param nsId          nsId of this nn.
+   * @param nnId          nnId of this nn.
+   * @param serviceAddr   Provided service address.
+   * @param addr          Provided service address.
+   * @param lifelineAddr  Provided service address.
+   */
+  public NNHAServiceTarget(Configuration conf,

Review comment:
       Added a simple test per comment.




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