YARN-2538. Added logs when RM sends roll-overed AMRMToken to AM. Contributed by Xuan Gong.

hadoop-yarn-project/CHANGES.txt

@@ -208,6 +208,9 @@ Release 2.6.0 - UNRELEASED
     YARN-2448. Changed ApplicationMasterProtocol to expose RM-recognized resource
     types to the AMs. (Varun Vasudev via vinodkv)
 
+    YARN-2538. Added logs when RM sends roll-overed AMRMToken to AM. (Xuan Gong
+    via zjshen)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java

@@ -581,6 +581,8 @@ public AllocateResponse allocate(AllocateRequest request)
           .newInstance(amrmToken.getIdentifier(), amrmToken.getKind()
             .toString(), amrmToken.getPassword(), amrmToken.getService()
             .toString()));
+        LOG.info("The AMRMToken has been rolled-over. Send new AMRMToken back"
+            + " to application: " + appAttemptId.getApplicationId());
       }
 
       /*