HADOOP-19359. Accelerate token negotiation for other similar mechanisms.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java

@@ -2673,7 +2673,7 @@ private RpcSaslProto buildSaslNegotiateResponse()
       // accelerate token negotiation by sending initial challenge
       // in the negotiation response
       if (enabledAuthMethods.contains(AuthMethod.TOKEN)
-          && SaslMechanismFactory.isDefaultMechanism(AuthMethod.TOKEN.getMechanismName())) {
+          && SaslMechanismFactory.isDigestMechanism(AuthMethod.TOKEN.getMechanismName())) {
         saslServer = createSaslServer(AuthMethod.TOKEN);
         byte[] challenge = saslServer.evaluateResponse(new byte[0]);
         RpcSaslProto.Builder negotiateBuilder =

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/CustomizedCallbackHandler.java

@@ -47,7 +47,7 @@ private static synchronized CustomizedCallbackHandler getSynchronously(
 
       //cache miss
       final Class<?> clazz = conf.getClass(key, DefaultHandler.class);
-      LOG.info("{} = {}", key, clazz);
+      LOG.debug("{} = {}", key, clazz);
       if (clazz == DefaultHandler.class) {
         return DefaultHandler.INSTANCE;
       }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslMechanismFactory.java

@@ -65,5 +65,13 @@ public static boolean isDefaultMechanism(String saslMechanism) {
     return HADOOP_SECURITY_SASL_MECHANISM_DEFAULT.equals(saslMechanism);
   }
 
+  public static boolean isDigestMechanism(String saslMechanism) {
+    return saslMechanism.startsWith("DIGEST-");
+  }
+
   private SaslMechanismFactory() {}
+
+  public static void main(String[] args) {
+    System.out.println("SASL_MECHANISM = " + getMechanism());
+  }
 }