HDFS-9085. Show renewer information in DelegationTokenIdentifier#toString. Contributed by Zhihai Xu.

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/security/token/delegation/DelegationTokenIdentifier.java

@@ -61,7 +61,8 @@ public class DelegationTokenIdentifier
   @Override
   public String toString() {
     return getKind() + " token " + getSequenceNumber()
-        + " for " + getUser().getShortUserName();
+        + " for " + getUser().getShortUserName() + " with renewer " +
+        getRenewer();
   }
 
   /** @return a string representation of the token */

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

@@ -39,6 +39,9 @@ Trunk (Unreleased)
     HDFS-8981. Adding revision to data node jmx getVersion() method. (Siqi Li
     via mingma)
 
+    HDFS-9085. Show renewer information in DelegationTokenIdentifier#toString.
+    (Zhihai Xu via cnauroth)
+
   NEW FEATURES
 
     HDFS-3125. Add JournalService to enable Journal Daemon. (suresh)

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/security/TestDelegationToken.java

@@ -314,4 +314,13 @@ public class TestDelegationToken {
           }
         });
   }
+
+  @Test
+  public void testDelegationTokenIdentifierToString() throws Exception {
+    DelegationTokenIdentifier dtId = new DelegationTokenIdentifier(new Text(
+        "SomeUser"), new Text("JobTracker"), null);
+    Assert.assertEquals("HDFS_DELEGATION_TOKEN token 0" +
+        " for SomeUser with renewer JobTracker",
+        dtId.toString());
+  }
 }