HDFS-6476. Print out the KeyProvider after finding KP successfully on startup. Contributed by Juan Yu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/fs-encryption@1600799 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -8,6 +8,9 @@ fs-encryption (Unreleased)
 
   IMPROVEMENTS
 
+    HDFS-6476. Print out the KeyProvider after finding KP successfully on
+    startup. (Juan Yu via wang)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java

@@ -730,6 +730,7 @@ public class NameNode implements NameNodeStatusMXBean {
         LOG.error(err);
         throw new RuntimeException(err);
       }
+      LOG.info("Found KeyProvider: " + provider.toString());
     } catch (IOException e) {
       LOG.error("Exception while initializing KeyProvider", e);
     }