HDFS-7956. Improve logging for DatanodeRegistration. Contributed by Plamen Jeliazkov.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -777,6 +777,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-7917. Use file to replace data dirs in test to simulate a disk failure.
     (Lei (Eddy) Xu via cnauroth)
 
+    HDFS-7956. Improve logging for DatanodeRegistration.
+    (Plamen Jeliazkov via shv)
+
   OPTIMIZATIONS
 
     HDFS-7454. Reduce memory footprint for AclEntries in NameNode.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/DatanodeRegistration.java

@@ -100,7 +100,7 @@ public class DatanodeRegistration extends DatanodeID
   @Override
   public String toString() {
     return getClass().getSimpleName()
-      + "(" + getIpAddr()
+      + "(" + super.toString()
       + ", datanodeUuid=" + getDatanodeUuid()
       + ", infoPort=" + getInfoPort()
       + ", infoSecurePort=" + getInfoSecurePort()