Demo: Running Spark Application on minikube¶
This demo shows how to deploy a Spark application to Kubernetes (using minikube).
Before you begin¶
It is assumed that you have finished the following:
Start Cluster¶
Unless already started, start minikube.
minikube start
Build Spark Application Image¶
Important
Make sure you've got a Spark image available in minikube's Docker registry (as described in Demo: spark-shell on minikube).
Point the shell to minikube's Docker daemon and make sure there is the Spark image (that your Spark application project uses).
eval $(minikube -p minikube docker-env)
List the Spark image.
docker images spark
REPOSITORY TAG IMAGE ID CREATED SIZE
spark v3.2.1 b3412e410d67 2 hours ago 524MB
Use this image in the Dockerfile of your Spark application:
FROM spark:v3.2.1
Build and push the Docker image of your Spark application project to minikube's Docker repository.
Important
The following command assumes that you use Spark on Kubernetes Demos project.
sbt clean \
'set Docker/dockerRepository in `meetup-spark-app` := None' \
meetup-spark-app/docker:publishLocal
List the images and make sure that the image of your Spark application project is available.
docker images 'meetup*'
REPOSITORY TAG IMAGE ID CREATED SIZE
meetup-spark-app 0.1.0 3a867debc6c0 11 seconds ago 524MB
docker image inspect¶
Use docker image inspect command to display detailed information on the Spark application image.
docker image inspect meetup-spark-app:0.1.0
docker image history¶
Use docker image history command to show the history of the Spark application image.
docker image history meetup-spark-app:0.1.0
Create Kubernetes Resources¶
Create required Kubernetes resources to run a Spark application.
Spark official documentation
Learn more from the Spark official documentation.
Make sure to create the required Kubernetes resources (a service account and a cluster role binding) as without them you surely run into the following exception message:
Forbidden!Configured service account doesn't have access. Service account may have been revoked.
Declaratively¶
Use the following k8s/rbac.yml file (from the Spark on Kubernetes Demos project).
apiVersion: v1
kind: Namespace
metadata:
name: spark-demo
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: spark
namespace: spark-demo
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: spark-role
namespace: spark-demo
subjects:
- kind: ServiceAccount
name: spark
namespace: spark-demo
roleRef:
kind: ClusterRole
name: edit
apiGroup: rbac.authorization.k8s.io
---
Create the resources in the Kubernetes cluster.
k create -f k8s/rbac.yml
Tip
With declarative approach (using rbac.yml) cleaning up becomes as simple as k delete -f rbac.yml.
Imperatively¶
k create ns spark-demo
k create serviceaccount spark -n spark-demo
k create clusterrolebinding spark-role \
--clusterrole edit \
--serviceaccount spark-demo:spark \
-n spark-demo
Submit Spark Application to minikube¶
cd $SPARK_HOME
K8S_SERVER=$(k config view --output=jsonpath='{.clusters[].cluster.server}')
export POD_NAME=meetup-spark-app
export IMAGE_NAME=$POD_NAME:0.1.0
Please note the configuration properties (some not really necessary but make the demo easier to guide you through, e.g. spark.kubernetes.driver.pod.name).
./bin/spark-submit \
--master k8s://$K8S_SERVER \
--deploy-mode cluster \
--name $POD_NAME \
--class meetup.SparkApp \
--conf spark.kubernetes.container.image=$IMAGE_NAME \
--conf spark.kubernetes.driver.pod.name=$POD_NAME \
--conf spark.kubernetes.context=minikube \
--conf spark.kubernetes.namespace=spark-demo \
--conf spark.kubernetes.authenticate.driver.serviceAccountName=spark \
--verbose \
local:///opt/spark/jars/meetup.meetup-spark-app-0.1.0.jar STOP_THE_SPARKCONTEXT
Important
STOP_THE_SPARKCONTEXT application argument is to stop the SparkContext and the driver. The following commands may not work if executed with the argument since the Spark application is stopped.
Leave it out if you want to play with the commands that follow.
If all goes fine you should soon see termination reason: Completed message.
21/03/08 14:35:35 INFO LoggingPodStatusWatcherImpl: State changed, new state:
pod name: meetup-spark-app
namespace: spark-demo
labels: spark-app-selector -> spark-5eba470d52c64518a555951d011ca785, spark-role -> driver
pod uid: d61085f6-5764-4320-b77e-02dcd8334382
creation time: 2021-03-08T13:35:25Z
service account name: spark
volumes: spark-local-dir-1, spark-conf-volume-driver, spark-token-kzmdd
node name: minikube
start time: 2021-03-08T13:35:25Z
phase: Succeeded
container status:
container name: spark-kubernetes-driver
container image: meetup-spark-app:0.1.0
container state: terminated
container started at: 2021-03-08T13:35:27Z
container finished at: 2021-03-08T13:35:35Z
exit code: 0
termination reason: Completed
21/03/08 14:35:35 INFO LoggingPodStatusWatcherImpl: Application status for spark-5eba470d52c64518a555951d011ca785 (phase: Succeeded)
21/03/08 14:35:35 INFO LoggingPodStatusWatcherImpl: Container final statuses:
container name: spark-kubernetes-driver
container image: meetup-spark-app:0.1.0
container state: terminated
container started at: 2021-03-08T13:35:27Z
container finished at: 2021-03-08T13:35:35Z
exit code: 0
termination reason: Completed
21/03/08 14:35:35 INFO LoggingPodStatusWatcherImpl: Application meetup-spark-app with submission ID spark-demo:meetup-spark-app finished
21/03/08 14:35:35 DEBUG LoggingPodStatusWatcherImpl: Stopping watching application spark-5eba470d52c64518a555951d011ca785 with last-observed phase Succeeded
Accessing web UI¶
k port-forward $POD_NAME 4040:4040
Open http://localhost:4040.
Accessing Logs¶
Access the logs of the driver.
k logs -f $POD_NAME
Reviewing Spark Application Configuration¶
ConfigMap¶
CONFIG_MAP=$(k get cm -o name | grep spark-drv)
k describe $CONFIG_MAP
Volumes¶
Describe the driver pod and review volumes (.spec.volumes) and volume mounts (.spec.containers[].volumeMounts).
k describe po $POD_NAME
k get po $POD_NAME -o=jsonpath='{.spec.volumes}' | jq
[
{
"emptyDir": {},
"name": "spark-local-dir-1"
},
{
"configMap": {
"defaultMode": 420,
"items": [
{
"key": "log4j.properties",
"mode": 420,
"path": "log4j.properties"
},
{
"key": "spark.properties",
"mode": 420,
"path": "spark.properties"
}
],
"name": "spark-drv-b5cf5b7834f5a32d-conf-map"
},
"name": "spark-conf-volume-driver"
},
{
"name": "spark-token-sfqc9",
"secret": {
"defaultMode": 420,
"secretName": "spark-token-sfqc9"
}
}
]
Volume Mounts¶
k get po $POD_NAME -o=jsonpath='{.spec.containers[].volumeMounts}' | jq
[
{
"mountPath": "/var/data/spark-e32e4d73-af0e-43ce-8ffa-f4b64c642b86",
"name": "spark-local-dir-1"
},
{
"mountPath": "/opt/spark/conf",
"name": "spark-conf-volume-driver"
},
{
"mountPath": "/var/run/secrets/kubernetes.io/serviceaccount",
"name": "spark-token-sfqc9",
"readOnly": true
}
]
Services¶
k get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
meetup-spark-app-ab8a3a7834f5a022-driver-svc ClusterIP None <none> 7078/TCP,7079/TCP,4040/TCP 31m
Spark Application Management¶
K8S_SERVER=$(kubectl config view --output=jsonpath='{.clusters[].cluster.server}')
Application Status¶
./bin/spark-submit \
--master k8s://$K8S_SERVER \
--status "spark-demo:$POD_NAME"
Application status (driver):
pod name: meetup-spark-app
namespace: spark-demo
labels: spark-app-selector -> spark-0df2be7b2d8d40299e7a406564c9833c, spark-role -> driver
pod uid: 30a749a3-1060-49a7-b502-4a054ea33d30
creation time: 2021-02-09T13:18:14Z
service account name: spark
volumes: spark-local-dir-1, spark-conf-volume-driver, spark-token-hqc6k
node name: minikube
start time: 2021-02-09T13:18:14Z
phase: Running
container status:
container name: spark-kubernetes-driver
container image: meetup-spark-app:0.1.0
container state: running
container started at: 2021-02-09T13:18:15Z
Stop Spark Application¶
./bin/spark-submit \
--master k8s://$K8S_SERVER \
--kill "spark-demo:$POD_NAME"
Clean Up¶
Clean up the cluster as described in Demo: spark-shell on minikube.
That's it. Congratulations!