Add parameters on 'sparkctl create' to delete SparkApplication if exists and to follow logs (#1506)

Author: andlaurentino

sparkctl/cmd/create.go

@@ -41,6 +41,8 @@ import (
 
 const bufferSize = 1024
 
+var DeleteIfExists bool
+var LogsEnabled bool
 var RootPath string
 var UploadToPath string
 var UploadToEndpoint string
@@ -90,6 +92,10 @@ var createCmd = &cobra.Command{
 }
 
 func init() {
+	createCmd.Flags().BoolVarP(&DeleteIfExists, "delete", "d", false,
+		"delete the SparkApplication if already exists")
+	createCmd.Flags().BoolVarP(&LogsEnabled, "logs", "l", false,
+		"watch the SparkApplication logs")
 	createCmd.Flags().StringVarP(&UploadToPath, "upload-to", "u", "",
 		"the name of the bucket where local application dependencies are to be uploaded")
 	createCmd.Flags().StringVarP(&RootPath, "upload-prefix", "p", "",
@@ -151,6 +157,10 @@ func createFromScheduledSparkApplication(name string, kubeClient clientset.Inter
 }
 
 func createSparkApplication(app *v1beta2.SparkApplication, kubeClient clientset.Interface, crdClient crdclientset.Interface) error {
+	if DeleteIfExists {
+		deleteSparkApplication(app.Name, crdClient)
+	}
+
 	v1beta2.SetSparkApplicationDefaults(app)
 	if err := validateSpec(app.Spec); err != nil {
 		return err
@@ -177,6 +187,10 @@ func createSparkApplication(app *v1beta2.SparkApplication, kubeClient clientset.
 
 	fmt.Printf("SparkApplication \"%s\" created\n", app.Name)
 
+	if LogsEnabled {
+		doLog(app.Name, true, kubeClient, crdClient)
+	}
+
 	return nil
 }
 

sparkctl/cmd/delete.go

@@ -51,12 +51,15 @@ var deleteCmd = &cobra.Command{
 }
 
 func doDelete(name string, crdClientset crdclientset.Interface) error {
-	err := crdClientset.SparkoperatorV1beta2().SparkApplications(Namespace).Delete(context.TODO(), name, metav1.DeleteOptions{})
-	if err != nil {
+	if err := deleteSparkApplication(name, crdClientset); err != nil {
 		return err
 	}
 
 	fmt.Printf("SparkApplication \"%s\" deleted\n", name)
 
 	return nil
 }
+
+func deleteSparkApplication(name string, crdClientset crdclientset.Interface) error {
+	return crdClientset.SparkoperatorV1beta2().SparkApplications(Namespace).Delete(context.TODO(), name, metav1.DeleteOptions{})
+}

sparkctl/cmd/log.go

@@ -21,7 +21,7 @@ import (
 	"fmt"
 	"io"
 	"os"
-	"strings"
+	"time"
 
 	"github.com/spf13/cobra"
 
@@ -57,7 +57,7 @@ var logCommand = &cobra.Command{
 			return
 		}
 
-		if err := doLog(args[0], kubeClientset, crdClientset); err != nil {
+		if err := doLog(args[0], FollowLogs, kubeClientset, crdClientset); err != nil {
 			fmt.Fprintf(os.Stderr, "failed to get driver logs of SparkApplication %s: %v\n", args[0], err)
 		}
 	},
@@ -69,36 +69,76 @@ func init() {
 	logCommand.Flags().BoolVarP(&FollowLogs, "follow", "f", false, "whether to stream the logs")
 }
 
-func doLog(name string, kubeClientset clientset.Interface, crdClientset crdclientset.Interface) error {
-	app, err := crdClientset.SparkoperatorV1beta2().SparkApplications(Namespace).Get(context.TODO(), name, metav1.GetOptions{})
-	if err != nil {
-		return fmt.Errorf("failed to get SparkApplication %s: %v", name, err)
-	}
+func doLog(
+	name string,
+	followLogs bool,
+	kubeClient clientset.Interface,
+	crdClient crdclientset.Interface) error {
 
+	timeout := 30 * time.Second
+
+	podNameChannel := getPodNameChannel(name, crdClient)
 	var podName string
-	if ExecutorId < 0 {
-		podName = app.Status.DriverInfo.PodName
-	} else {
-		podName = strings.NewReplacer("driver", fmt.Sprintf("exec-%d", ExecutorId)).
-			Replace(app.Status.DriverInfo.PodName)
+
+	select {
+	case podName = <-podNameChannel:
+	case <-time.After(timeout):
+		return fmt.Errorf("not found pod name")
 	}
 
-	if podName == "" {
-		return fmt.Errorf("unable to fetch logs as the name of the target pod is empty")
+	waitLogsChannel := waitForLogsFromPodChannel(podName, kubeClient, crdClient)
+
+	select {
+	case <-waitLogsChannel:
+	case <-time.After(timeout):
+		return fmt.Errorf("timeout to fetch logs from pod \"%s\"", podName)
 	}
 
-	out := os.Stdout
-	if FollowLogs {
-		if err := streamLogs(out, kubeClientset, podName); err != nil {
-			return err
-		}
+	if followLogs {
+		return streamLogs(os.Stdout, kubeClient, podName)
 	} else {
-		if err := printLogs(out, kubeClientset, podName); err != nil {
-			return err
-		}
+		return printLogs(os.Stdout, kubeClient, podName)
 	}
+}
 
-	return nil
+func getPodNameChannel(
+	sparkApplicationName string,
+	crdClient crdclientset.Interface) chan string {
+
+	channel := make(chan string, 1)
+	go func() {
+		for true {
+			app, _ := crdClient.SparkoperatorV1beta2().SparkApplications(Namespace).Get(
+				context.TODO(),
+				sparkApplicationName,
+				metav1.GetOptions{})
+
+			if app.Status.DriverInfo.PodName != "" {
+				channel <- app.Status.DriverInfo.PodName
+				break
+			}
+		}
+	}()
+	return channel
+}
+
+func waitForLogsFromPodChannel(
+	podName string,
+	kubeClient clientset.Interface,
+	crdClient crdclientset.Interface) chan bool {
+
+	channel := make(chan bool, 1)
+	go func() {
+		for true {
+			_, err := kubeClient.CoreV1().Pods(Namespace).GetLogs(podName, &apiv1.PodLogOptions{}).Do(context.TODO()).Raw()
+
+			if err == nil {
+				channel <- true
+				break
+			}
+		}
+	}()
+	return channel
 }
 
 // printLogs is a one time operation that prints the fetched logs of the given pod.