@Override
 public void sendRemote(
     HStoreService channel,
     ProtoRpcController controller,
     TransactionMapRequest request,
     RpcCallback<TransactionMapResponse> callback) {
   channel.transactionMap(controller, request, callback);
 }
 @Override
 public void sendRemote(
     HStoreService channel,
     ProtoRpcController controller,
     TransactionPrefetchResult request,
     RpcCallback<TransactionPrefetchAcknowledgement> callback) {
   channel.transactionPrefetch(controller, request, callback);
 }