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(kuberay-batch-inference-example)=

RayJob Batch Inference Example

This example demonstrates how to use the RayJob custom resource to run a batch inference job on a Ray cluster.

This example uses an image classification workload, which is based on https://docs.ray.io/en/latest/data/examples/huggingface_vit_batch_prediction.html. See that page for a full explanation of the code.

Prerequisites

You must have a Kubernetes cluster running,kubectl configured to use it, and GPUs available. This example provides a brief tutorial for setting up the necessary GPUs on Google Kubernetes Engine (GKE), but you can use any Kubernetes cluster with GPUs.

Step 0: Create a Kubernetes cluster on GKE (Optional)

If you already have a Kubernetes cluster with GPUs, you can skip this step.

Otherwise, follow this tutorial, but substitute the following GPU node pool creation command to create a Kubernetes cluster on GKE with four Nvidia T4 GPUs:

gcloud container node-pools create gpu-node-pool \
  --accelerator type=nvidia-tesla-t4,count=4,gpu-driver-version=default \
  --zone us-west1-b \
  --cluster kuberay-gpu-cluster \
  --num-nodes 1 \
  --min-nodes 0 \
  --max-nodes 1 \
  --enable-autoscaling \
  --machine-type n1-standard-64

This example uses four Nvidia T4 GPUs. The machine type is n1-standard-64, which has 64 vCPUs and 240 GB RAM.

Step 1: Install the KubeRay Operator

Follow this document to install the latest stable KubeRay operator from the Helm repository.

It should be scheduled on the CPU pod.

Step 2: Submit the RayJob

Create the RayJob custom resource. The RayJob spec is defined in ray-job.batch-inference.yaml.

Download the file with curl:

curl -LO https://raw.githubusercontent.com/ray-project/kuberay/master/ray-operator/config/samples/ray-job.batch-inference.yaml

Note that the RayJob spec contains a spec for the RayCluster that is to be created for the job. For this tutorial, we use a single-node cluster with 4 GPUs. For production use cases, we recommend using a multi-node cluster where the head node does not have GPUs, so that Ray can automatically schedule GPU workloads on worker nodes and they won't interfere with critical Ray processes on the head node.

Note the following fields in the RayJob spec, which specify the Ray image and the GPU resources for the Ray node:

        spec:
          containers:
            - name: ray-head
              image: rayproject/ray-ml:2.6.3-gpu
              resources:
                limits:
                  nvidia.com/gpu: "4"
                  cpu: "54"
                  memory: "54Gi"
                requests:
                  nvidia.com/gpu: "4"
                  cpu: "54"
                  memory: "54Gi"
              volumeMounts:
                - mountPath: /home/ray/samples
                  name: code-sample
          nodeSelector:
            cloud.google.com/gke-accelerator: nvidia-tesla-t4 # This is the GPU type we used in the GPU node pool.

To submit the job, run the following command:

kubectl apply -f ray-job.batch-inference.yaml

Check the status with kubectl describe rayjob rayjob-sample.

Sample output:

[...]
Status:
  Dashboard URL:          rayjob-sample-raycluster-j6t8n-head-svc.default.svc.cluster.local:8265
  End Time:               2023-08-22T22:48:35Z
  Job Deployment Status:  Running
  Job Id:                 rayjob-sample-ft8lh
  Job Status:             SUCCEEDED
  Message:                Job finished successfully.
  Observed Generation:    2
  Ray Cluster Name:       rayjob-sample-raycluster-j6t8n
  Ray Cluster Status:
    Endpoints:
      Client:        10001
      Dashboard:     8265
      Gcs - Server:  6379
      Metrics:       8080
    Head:
      Pod IP:             10.112.1.3
      Service IP:         10.116.1.93
    Last Update Time:     2023-08-22T22:47:44Z
    Observed Generation:  1
    State:                ready
  Start Time:             2023-08-22T22:48:02Z
Events:
  Type    Reason   Age   From               Message
  ----    ------   ----  ----               -------
  Normal  Created  36m   rayjob-controller  Created cluster rayjob-sample-raycluster-j6t8n
  Normal  Created  32m   rayjob-controller  Created k8s job rayjob-sample

To view the logs, first find the name of the pod running the job with kubectl get pods.

Sample output:

NAME                                        READY   STATUS      RESTARTS   AGE
kuberay-operator-8b86754c-r4rc2             1/1     Running     0          25h
rayjob-sample-raycluster-j6t8n-head-kx2gz   1/1     Running     0          35m
rayjob-sample-w98c7                         0/1     Completed   0          30m

The Ray cluster is still running because shutdownAfterJobFinishes is not set in the RayJob spec. If you set shutdownAfterJobFinishes to true, the cluster is shut down after the job finishes.

Next, run:

kubetcl logs rayjob-sample-w98c7

to get the standard output of the entrypoint command for the RayJob. Sample output:

[...]
Running: 62.0/64.0 CPU, 4.0/4.0 GPU, 955.57 MiB/12.83 GiB object_store_memory:   0%|          | 0/200 [00:05<?, ?it/s]
Running: 61.0/64.0 CPU, 4.0/4.0 GPU, 999.41 MiB/12.83 GiB object_store_memory:   0%|          | 0/200 [00:05<?, ?it/s]
Running: 61.0/64.0 CPU, 4.0/4.0 GPU, 999.41 MiB/12.83 GiB object_store_memory:   0%|          | 1/200 [00:05<17:04,  5.15s/it]
Running: 61.0/64.0 CPU, 4.0/4.0 GPU, 1008.68 MiB/12.83 GiB object_store_memory:   0%|          | 1/200 [00:05<17:04,  5.15s/it]
Running: 61.0/64.0 CPU, 4.0/4.0 GPU, 1008.68 MiB/12.83 GiB object_store_memory: 100%|██████████| 1/1 [00:05<00:00,  5.15s/it]  
                                                                                                                             
2023-08-22 15:48:33,905 WARNING actor_pool_map_operator.py:267 -- To ensure full parallelization across an actor pool of size 4, the specified batch size should be at most 5. Your configured batch size for this operator was 16.
<PIL.Image.Image image mode=RGB size=500x375 at 0x7B37546CF7F0>
Label:  tench, Tinca tinca
<PIL.Image.Image image mode=RGB size=500x375 at 0x7B37546AE430>
Label:  tench, Tinca tinca
<PIL.Image.Image image mode=RGB size=500x375 at 0x7B37546CF430>
Label:  tench, Tinca tinca
<PIL.Image.Image image mode=RGB size=500x375 at 0x7B37546AE430>
Label:  tench, Tinca tinca
<PIL.Image.Image image mode=RGB size=500x375 at 0x7B37546CF7F0>
Label:  tench, Tinca tinca
2023-08-22 15:48:36,522 SUCC cli.py:33 -- -----------------------------------
2023-08-22 15:48:36,522 SUCC cli.py:34 -- Job 'rayjob-sample-ft8lh' succeeded
2023-08-22 15:48:36,522 SUCC cli.py:35 -- -----------------------------------