diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java
index 33314060a5..3ea32bc41e 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java
@@ -136,6 +136,7 @@ public byte[] getIdentifier() {
         while (tokenIdentifiers.hasNext()) {
           try {
             TokenIdentifier id = tokenIdentifiers.next();
+            LOG.debug("Added {}:{} into tokenKindMap", id.getKind(), id.getClass());
             tokenKindMap.put(id.getKind(), id.getClass());
           } catch (ServiceConfigurationError | LinkageError e) {
             // failure to load a token implementation