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Inference Logger

Basic Inference Logger

Create Message Dumper

Create a message dumper Knative Service which will print out the CloudEvents it receives.

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: message-dumper
spec:
  template:
    spec:
      containers:
      - image: gcr.io/knative-releases/knative.dev/eventing-contrib/cmd/event_display
kubectl create -f message-dumper.yaml

Create an InferenceService with Logger

Create a sklearn predictor with the logger which points at the message dumper url.

apiVersion: serving.kserve.io/v1beta1
kind: InferenceService
metadata:
  name: sklearn-iris
spec:
  predictor:
    logger:
      mode: all
      url: http://message-dumper.default/
    sklearn:
      storageUri: gs://kfserving-samples/models/sklearn/iris

Note

Here we set the url explicitly, otherwise it defaults to the namespace knative broker or the value of DefaultUrl in the logger section of the inference service configmap.

kubectl create -f sklearn-basic-logger.yaml

We can now send a request to the sklearn model. The first step is to determine the ingress IP and ports and set INGRESS_HOST and INGRESS_PORT

MODEL_NAME=sklearn-iris
INPUT_PATH=@./input.json
SERVICE_HOSTNAME=$(kubectl get inferenceservice sklearn-iris -o jsonpath='{.status.url}' | cut -d "/" -f 3)

curl -v -H "Host: ${SERVICE_HOSTNAME}" http://${INGRESS_HOST}:${INGRESS_PORT}/v1/models/$MODEL_NAME:predict -d $INPUT_PATH

Expected Output

{
    "predictions": [1, 1]
}

Check CloudEvents

Check the logs of the message dumper, we can see the CloudEvents associated with our previous curl request.

kubectl logs $(kubectl get pod -l serving.knative.dev/service=message-dumper -o jsonpath='{.items[0].metadata.name}') user-container

Expected Output

☁️  cloudevents.Event
Validation: valid
Context Attributes,
  specversion: 1.0
  type: org.kubeflow.serving.inference.request
  source: http://localhost:9081/
  id: 0009174a-24a8-4603-b098-09c8799950e9
  time: 2021-04-10T00:23:26.0789529Z
  datacontenttype: application/json
Extensions,
  endpoint:
  inferenceservicename: sklearn-iris
  namespace: default
  traceparent: 00-90bdf848647d50283394155d2df58f19-84dacdfdf07cadfc-00
Data,
  {
    "instances": [
      [
        6.8,
        2.8,
        4.8,
        1.4
      ],
      [
        6.0,
        3.4,
        4.5,
        1.6
      ]
    ]
  }
☁️  cloudevents.Event
Validation: valid
Context Attributes,
  specversion: 1.0
  type: org.kubeflow.serving.inference.response
  source: http://localhost:9081/
  id: 0009174a-24a8-4603-b098-09c8799950e9
  time: 2021-04-10T00:23:26.080736102Z
  datacontenttype: application/json
Extensions,
  endpoint:
  inferenceservicename: sklearn-iris
  namespace: default
  traceparent: 00-55de1514e1d23ee17eb50dda6167bb8c-b6c6e0f6dd8f741d-00
Data,
  {
    "predictions": [
      1,
      1
    ]
  }

Knative Eventing Inference Logger

A cluster running with Knative Eventing installed, along with KServe.

Note

This was tested using Knative Eventing v0.17.

Create Message Dumper

Create a message dumper Knative service which will print out the CloudEvents it receives.

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: message-dumper
spec:
  template:
    spec:
      containers:
      - image: gcr.io/knative-releases/knative.dev/eventing-contrib/cmd/event_display
kubectl apply -f message-dumper.yaml

Create Channel Broker

Create a Broker which allows you route events to consumers like InferenceService.

apiVersion: eventing.knative.dev/v1
kind: broker
metadata:
  name: default
kubectl apply -f broker.yaml

kubectl get broker default

Take note of the broker URL as that is what we'll be using in the InferenceService later on.

Create Trigger

We now create a trigger to forward the events to message-dumper service. The trigger can specify a filter that enables selection of relevant events based on the Cloud Event context attributes.

apiVersion: eventing.knative.dev/v1
kind: Trigger
metadata:
  name: message-dumper-trigger
spec:
  broker: default
  subscriber:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: message-dumper
kubectl create -f trigger.yaml

Create an InferenceService with Logger

Create a sklearn predictor with the logger url pointing to the Knative eventing multi-tenant broker in knative-eventing namespace.

apiVersion: serving.kserve.io/v1beta1
kind: InferenceService
metadata:
  name: sklearn-iris
spec:
  predictor:
    minReplicas: 1
    logger:
      mode: all
      url: http://broker-ingress.knative-eventing.svc.cluster.local/default/default
    sklearn:
      storageUri: gs://kfserving-samples/models/sklearn/iris
kubectl create -f sklearn-knative-eventing.yaml

We can now send a request to the sklearn model. The first step is to determine the ingress IP and ports and set INGRESS_HOST and INGRESS_PORT

MODEL_NAME=sklearn-iris
INPUT_PATH=@./input.json
SERVICE_HOSTNAME=$(kubectl get inferenceservice sklearn-iris -o jsonpath='{.status.url}' | cut -d "/" -f 3)

curl -v -H "Host: ${SERVICE_HOSTNAME}" http://${INGRESS_HOST}:${INGRESS_PORT}/v1/models/$MODEL_NAME:predict -d $INPUT_PATH

Expected Output

{
    "predictions": [1, 1]
}

Check CloudEvents

Check the logs of the message dumper, we can see the CloudEvents associated with our previous curl request.

kubectl logs $(kubectl get pod -l serving.knative.dev/service=message-dumper -o jsonpath='{.items[0].metadata.name}') user-container

Expected Output

☁️  cloudevents.Event
Validation: valid
Context Attributes,
  specversion: 1.0
  type: org.kubeflow.serving.inference.request
  source: http://localhost:9081/
  id: defb5816-35f7-4947-a2b1-b9e5d7764ad2
  time: 2021-04-10T01:22:16.498917288Z
  datacontenttype: application/json
Extensions,
  endpoint:
  inferenceservicename: sklearn-iris
  knativearrivaltime: 2021-04-10T01:22:16.500656431Z
  knativehistory: default-kne-trigger-kn-channel.default.svc.cluster.local
  namespace: default
  traceparent: 00-16456300519c5227ffe5f784a88da2f7-2db26af1daae870c-00
Data,
  {
    "instances": [
      [
        6.8,
        2.8,
        4.8,
        1.4
      ],
      [
        6.0,
        3.4,
        4.5,
        1.6
      ]
    ]
  }
☁️  cloudevents.Event
Validation: valid
Context Attributes,
  specversion: 1.0
  type: org.kubeflow.serving.inference.response
  source: http://localhost:9081/
  id: defb5816-35f7-4947-a2b1-b9e5d7764ad2
  time: 2021-04-10T01:22:16.500492939Z
  datacontenttype: application/json
Extensions,
  endpoint:
  inferenceservicename: sklearn-iris
  knativearrivaltime: 2021-04-10T01:22:16.501931207Z
  knativehistory: default-kne-trigger-kn-channel.default.svc.cluster.local
  namespace: default
  traceparent: 00-2156a24451a4d4ea575fcf6c4f52a672-2b6ea035c83d3200-00
Data,
  {
    "predictions": [
      1,
      1
    ]
  }