HADOOP-17392. Remote exception messages should not include the exception class (#2486). Contributed by Daryn Sharp and Ahmed Hussein

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

@@ -18,6 +18,7 @@
 
 package org.apache.hadoop.ipc;
 
+import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
 import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
 import org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
@@ -857,7 +858,8 @@ public class Client implements AutoCloseable {
               }
             } else if (UserGroupInformation.isSecurityEnabled()) {
               if (!fallbackAllowed) {
-                throw new IOException("Server asks us to fall back to SIMPLE " +
+                throw new AccessControlException(
+                    "Server asks us to fall back to SIMPLE " +
                     "auth, but this client is configured to only allow secure " +
                     "connections.");
               }

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

@@ -2202,7 +2202,7 @@ public abstract class Server {
     private void doSaslReply(Exception ioe) throws IOException {
       setupResponse(authFailedCall,
           RpcStatusProto.FATAL, RpcErrorCodeProto.FATAL_UNAUTHORIZED,
-          null, ioe.getClass().getName(), ioe.toString());
+          null, ioe.getClass().getName(), ioe.getMessage());
       sendResponse(authFailedCall);
     }
 
@@ -2597,8 +2597,7 @@ public abstract class Server {
         final RpcCall call = new RpcCall(this, callId, retry);
         setupResponse(call,
             rse.getRpcStatusProto(), rse.getRpcErrorCodeProto(), null,
-            t.getClass().getName(),
+            t.getClass().getName(), t.getMessage());
-            t.getMessage() != null ? t.getMessage() : t.toString());
         sendResponse(call);
       }
     }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetUtils.java

@@ -46,6 +46,7 @@ import java.util.concurrent.ConcurrentHashMap;
 
 import javax.net.SocketFactory;
 
+import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.thirdparty.com.google.common.cache.Cache;
 import org.apache.hadoop.thirdparty.com.google.common.cache.CacheBuilder;
 
@@ -874,6 +875,11 @@ public class NetUtils {
                 + " failed on socket exception: " + exception
                 + ";"
                 + see("SocketException"));
+      } else if (exception instanceof AccessControlException) {
+        return wrapWithMessage(exception,
+            "Call From "
+                + localHost + " to " + destHost + ":" + destPort
+                + " failed: " + exception.getMessage());
       } else {
         // 1. Return instance of same type with exception msg if Exception has a
         // String constructor.

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestSaslRPC.java

@@ -533,12 +533,15 @@ public class TestSaslRPC extends TestRpcBase {
   }
   
   private static Pattern BadToken =
-      Pattern.compile(".*DIGEST-MD5: digest response format violation.*");
+      Pattern.compile("^" + RemoteException.class.getName() +
+          "\\("+ SaslException.class.getName() + "\\): " +
+          "DIGEST-MD5: digest response format violation.*");
   private static Pattern KrbFailed =
       Pattern.compile(".*Failed on local exception:.* " +
                       "Failed to specify server's Kerberos principal name.*");
   private static Pattern Denied(AuthMethod method) {
-      return Pattern.compile(".*RemoteException.*AccessControlException.*: "
+    return Pattern.compile("^" + RemoteException.class.getName() +
+        "\\(" + AccessControlException.class.getName() + "\\): "
         + method + " authentication is not enabled.*");
   }
   private static Pattern No(AuthMethod ... method) {
@@ -547,10 +550,10 @@ public class TestSaslRPC extends TestRpcBase {
         "Client cannot authenticate via:\\[" + methods + "\\].*");
   }
   private static Pattern NoTokenAuth =
-      Pattern.compile(".*IllegalArgumentException: " +
+      Pattern.compile("^" + IllegalArgumentException.class.getName() + ": " +
                       "TOKEN authentication requires a secret manager");
   private static Pattern NoFallback = 
-      Pattern.compile(".*Failed on local exception:.* " +
+      Pattern.compile("^" + AccessControlException.class.getName() + ":.* " +
           "Server asks us to fall back to SIMPLE auth, " +
           "but this client is configured to only allow secure connections.*");