HDFS-2694. Removal of Avro broke non-PB NN services. Contributed by Aaron T. Myers.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1215364 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -170,6 +170,8 @@ Trunk (unreleased changes)
     HDFS-1765. Block Replication should respect under-replication
     block priority. (Uma Maheswara Rao G via eli)
 
+    HDFS-2694. Removal of Avro broke non-PB NN services. (atm)
+
 Release 0.23.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

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

@@ -94,6 +94,7 @@ import org.apache.hadoop.ipc.ProtobufRpcEngine;
 import org.apache.hadoop.ipc.ProtocolSignature;
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.ipc.Server;
+import org.apache.hadoop.ipc.WritableRpcEngine;
 import org.apache.hadoop.ipc.RpcPayloadHeader.RpcKind;
 import org.apache.hadoop.net.Node;
 import org.apache.hadoop.security.AccessControlException;
@@ -161,6 +162,8 @@ class NameNodeRpcServer implements NamenodeProtocols {
 	  BlockingService NNPbService = NamenodeProtocolService
           .newReflectiveBlockingService(namenodeProtocolXlator);
     
+    WritableRpcEngine.ensureInitialized();
+    
     InetSocketAddress dnSocketAddr = nn.getServiceRpcServerAddress(conf);
     if (dnSocketAddr != null) {
       int serviceHandlerCount =