added concurrency target arg

Signed-off-by: Dmitrii Ustiugov <dmitrii.ustiugov@epfl.ch>

examples/deployer/client.go

@@ -1,3 +1,25 @@
+// MIT License
+//
+// Copyright (c) 2020 Dmitrii Ustiugov and EASE lab
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
 package main
 
 import (
@@ -95,7 +117,16 @@ func deploy(funcPath string, funcSlice []functionType, deploymentConcurrency int
 }
 
 func deployFunction(fID, filePath string) {
-	cmd := exec.Command("kn", "service", "apply", fID, "-f", filePath)
+	cmd := exec.Command(
+		"kn",
+		"service",
+		"apply",
+		fID,
+		"-f",
+		filePath,
+		"--concurrency-target",
+		"1",
+	)
 	stdoutStderr, err := cmd.CombinedOutput()
 	if err != nil {
 		log.Warnf("Failed to deploy function %s, %s: %v\n%s\n", fID, filePath, err, stdoutStderr)