svn merge -c 1179869 from trunk for HADOOP-7721.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1189476 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/KerberosAuthenticationHandler.java

@@ -160,6 +160,7 @@ public class KerberosAuthenticationHandler implements AuthenticationHandler {
 
       KerberosConfiguration kerberosConfiguration = new KerberosConfiguration(keytab, principal);
 
+      LOG.info("Login using keytab "+keytab+", for principal "+principal);
       loginContext = new LoginContext("", subject, null, kerberosConfiguration);
       loginContext.login();
 

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -2,6 +2,8 @@ Hadoop Change Log
 
     MAPREDUCE-2764. Fix renewal of dfs delegation tokens. (Owen via jitendra)
 
+    HADOOP-7721. Add log before login in KerberosAuthenticationHandler. (jitendra)
+
 Release 0.23.0 - Unreleased
 
   INCOMPATIBLE CHANGES