Don't log a warning on a retriable RPCError (#143)

Author: Kimahriman

rust/src/hdfs/proxy.rs

@@ -154,10 +154,11 @@ impl NameServiceProxy {
                 }
                 // RPCError indicates the call was successfully attempted but had an error, so should be returned immediately
                 Err(HdfsError::RPCError(exception, msg)) if !Self::is_retriable(&exception) => {
-                    warn!("{}: {}", exception, msg);
                     return Err(Self::convert_rpc_error(exception, msg));
                 }
                 Err(_) if attempts >= self.proxy_connections.len() - 1 => return result,
+                // Retriable error, do nothing and try the next connection
+                Err(HdfsError::RPCError(_, _)) => (),
                 Err(e) => {
                     warn!("{:?}", e);
                 }