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Version: 0.5.0

Run Python Functions

After packaging your Pulsar function, you can submit your Pulsar function to a Pulsar cluster. This section describes how to submit a Python function through a function CRD. You can use the image field to specify the runner image for creating the Python function. You can also specify the location where the package or the Docker image is stored.

  1. Define a Python function by using a YAML file and save the YAML file.

    • This example shows how to publish a python-function-sample function to a Pulsar cluster by using a JAR package called function://my-tenant/my-ns/my-function@0.1.

      apiVersion: compute.functionmesh.io/v1alpha1
      kind: Function
      metadata:
      name: python-function-sample
      namespace: default
      spec:
      image: streamnative/pulsar-functions-python-runner:2.7.1 # using python function runner
      className: exclamation_function.ExclamationFunction
      forwardSourceMessageProperty: true
      maxPendingAsyncRequests: 1000
      replicas: 1
      maxReplicas: 5
      logTopic: persistent://public/default/logging-function-logs
      input:
      topics:
      - persistent://public/default/python-function-input-topic
      typeClassName: java.lang.String
      output:
      topic: persistent://public/default/python-function-output-topic
      typeClassName: java.lang.String
      pulsar:
      pulsarConfig: "test-pulsar"
      python:
      py: exclamation_function.py
      pyLocation: ""
      # use package name:
      # pyLocation: function://public/default/nul-py-test-function@v1
      # to be delete & use admission hook
    • This example shows how to publish a python-function-sample function to a Pulsar cluster by using a Docker image.

      apiVersion: compute.functionmesh.io/v1alpha1
      kind: Function
      metadata:
      name: python-function-sample
      namespace: default
      spec:
      image: streamnative/example-function-image:latest # using function image here
      className: exclamation_function.ExclamationFunction
      forwardSourceMessageProperty: true
      maxPendingAsyncRequests: 1000
      replicas: 1
      maxReplicas: 5
      logTopic: persistent://public/default/logging-function-logs
      input:
      topics:
      - persistent://public/default/python-function-input-topic
      typeClassName: java.lang.String
      output:
      topic: persistent://public/default/python-function-output-topic
      typeClassName: java.lang.String
      pulsar:
      pulsarConfig: "test-pulsar"
      python:
      py: exclamation_function.py
      pyLocation: ""
      # use package name:
      # pyLocation: function://public/default/nul-py-test-function@v1
      # to be delete & use admission hook
  • This example shows how to publish a python-exclamation-function function to a Pulsar cluster by using the self-built image python-exclamation-function:v1.

    apiVersion: compute.functionmesh.io/v1alpha1
    kind: Function
    metadata:
    name: python-exclamation-function
    namespace: default
    spec:
    image: python-exclamation-function:v1
    className: exclamation_example.ExclamationFunction
    forwardSourceMessageProperty: true
    maxPendingAsyncRequests: 1000
    replicas: 1
    maxReplicas: 5
    logTopic: persistent://public/default/logging-function-logs
    input:
    topics:
    - persistent://public/default/input-python-topic
    output:
    topic: persistent://public/default/output-python-topic
    resources:
    requests:
    cpu: "0.1"
    memory: 1G
    limits:
    cpu: "0.2"
    memory: 1.1G
    secretsMap:
    "name":
    path: "test-secret"
    key: "username"
    "pwd":
    path: "test-secret"
    key: "password"
    pulsar:
    pulsarConfig: "test-pulsar"
    python:
    py: /pulsar/exclamation_example.py
    clusterName: test
    autoAck: true
    ---
    apiVersion: v1
    kind: ConfigMap
    metadata:
    name: test-pulsar
    data:
    webServiceURL: http://sn-platform-pulsar-broker.default.svc.cluster.local:8080
    brokerServiceURL: pulsar://sn-platform-pulsar-broker.default.svc.cluster.local:6650
    ---
    apiVersion: v1
    data:
    username: YWRtaW4=
    password: MWYyZDFlMmU2N2Rm
    kind: Secret
    metadata:
    name: test-secret
    type: Opaque
  1. Apply the YAML file to create the Python function.

    kubectl apply -f /path/to/YAML/file
  2. Check whether the Python function is created successfully.

    kubectl get all