Run Function Mesh

Function Mesh is a collection of functions collaborated together to process data with clearly-defined stages on Kubernetes environments.

This document describes how to run Function Mesh through a .yaml file and submit Pulsar connectors and Pulsar functions through the Function Mesh CRD.

Prerequisites

• Create and connect to a Kubernetes cluster.
• Create a Pulsar cluster in the Kubernetes cluster.
• Install the Function Mesh Operator and CRD into Kubernetes cluster.
• package Pulsar Functions, see package Pulsar Functions.
• Package Pulsar connectors. For details, see package Pulsar connectors.

Steps

To create a Function Mesh, follow these steps.

1. Define a Function Mesh named functionmesh-sample by using a YAML file and save the YAML file functionmesh-sample.yaml.

   apiVersion: compute.functionmesh.io/v1alpha1
   kind: FunctionMesh
   metadata:
     name: functionmesh-sample
   spec:
     sinks:
       name: sink-sample
       image: streamnative/pulsar-io-elastic-search:2.7.1 # using connector image here
       className: org.apache.pulsar.io.elasticsearch.ElasticSearchSink
       replicas: 1
       maxReplicas: 1
       input:
         topics:
         - persistent://public/default/input
         typeClassName: "[B"
       sinkConfig:
         elasticSearchUrl: "http://quickstart-es-http.default.svc.cluster.local:9200"
         indexName: "my_index"
         typeName: "doc"
         username: "elastic"
         password: "wJ757TmoXEd941kXm07Z2GW3"
       pulsar:
         pulsarConfig: "test-sink"
       resources:
         limits:
           cpu: "0.2"
           memory: 1.1G
         requests:
           cpu: "0.1"
           memory: 1G
       java:
         jar: connectors/pulsar-io-elastic-search-2.7.1.nar # the NAR location in image
         jarLocation: "" # leave empty since we will not download package from Pulsar Packages
       clusterName: test-pulsar
       autoAck: true
     functions:
       name: ex1
       className: exclamation_function.ExclamationFunction
       replicas: 1
       maxReplicas: 1
       logTopic: persistent://public/default/logging-function-log
       input:
         topics:
           - persistent://public/default/functionmesh-input-topic
         typeClassName: java.lang.String
       output:
         topic: persistent://public/default/mid-topic
         typeClassName: java.lang.String
       pulsar:
         pulsarConfig: "mesh-test-pulsar"
       java:
         jar: pulsar-functions-api-examples.jar
         jarLocation: public/default/nlu-test-functionmesh-ex1
       # following value must be provided if no auto-filling is enabled
       forwardSourceMessageProperty: true
       autoAck: true
       resources:
         requests:
           cpu: "0.1"
           memory: 1G
         limits:
           cpu: "0.2"
           memory: 1.1G
       clusterName: test-pulsar
   ---
   apiVersion: v1
   kind: ConfigMap
   metadata:
     name: mesh-test-pulsar
   data:
     webServiceURL: http://test-pulsar-broker.default.svc.cluster.local:8080
     brokerServiceURL: pulsar://test-pulsar-broker.default.svc.cluster.local:6650

2. Apply the YAML file to create the Function Mesh.

   kubectl apply -f /path/to/functionmesh-sample.yaml

3. Check whether the Function Mesh is created successfully.

   kubectl get all