Fix to fall back to key based config in binary mode for 1.4.5 engine

Author: rajaprabhu

src/main/java/net/spy/memcached/ConfigurationPoller.java

@@ -115,6 +115,13 @@ public void run(){
               newConfigResponse = (String)client.getConfig(socketAddressToGetConfig, 
                                                                                          ConfigurationType.CLUSTER,
                                                                                          configTranscoder);
+              if(newConfigResponse == null || newConfigResponse.trim().isEmpty()){
+                newConfigResponse = (String)client.get(socketAddressToGetConfig, ConfigurationType.CLUSTER.getValueWithNameSpace(), configTranscoder);
+                if(newConfigResponse != null && ! newConfigResponse.trim().isEmpty()){
+                  client.setIsConfigurationProtocolSupported(false);
+                }
+              }
+
             }catch(OperationNotSupportedException e){
               //Fallback to key based config access.
               client.setIsConfigurationProtocolSupported(false);

src/main/java/net/spy/memcached/MemcachedClient.java

@@ -316,16 +316,21 @@ private void initializeClientUsingConfigEndPoint(ConnectionFactory cf, InetSocke
       throws IOException{
     configurationNode = new NodeEndPoint(configurationEndPoint.getHostName(), configurationEndPoint.getPort());
     setupConnection(cf, Collections.singletonList(configurationEndPoint));
-    
-    String configResult;
+    boolean checkKey = false;
+    String configResult = null;
     try{
       try{
         //GetConfig
         configResult = (String)this.getConfig(configurationEndPoint, ConfigurationType.CLUSTER, configTranscoder);
       }catch(OperationNotSupportedException e){
-        
+        checkKey = true;
+      }
+
+      if(checkKey || configResult == null || configResult.trim().isEmpty()){
         configResult = (String)this.get(configurationEndPoint, ConfigurationType.CLUSTER.getValueWithNameSpace(), configTranscoder);
-        isConfigurationProtocolSupported = false;
+        if(configResult != null && ! configResult.trim().isEmpty()){
+          isConfigurationProtocolSupported = false;
+        }
       }
 
       if(configResult != null && ! configResult.trim().isEmpty()){