How to request more memory or cpu resources on a particular DAG task

Sometimes you need to run tasks that require more memory or compute power. Airflow task's definition that use a kubernetes execution environment allow for this type of configuration.

Similarly to how you overrode a worker's running environment , you need to specify the resources argument on the container spec.

Example DAG

In the following example, we're requesting a minimum of 8Gb of memory and 1000m of cpu in the requests dict to run the task. Click here to learn more about resources requests and limits on a kubernetes running environment.

Note : Keep in mind that if you request more resources than a node in the cluster could allocate the task will never run and the DAG will fail.

import datetime
from airflow.decorators import dag
from kubernetes.client import models as k8s
from operators.datacoves.bash import DatacovesBashOperator

# Configuration for Kubernetes Pod Override with Resource Requests
TRANSFORM_CONFIG = {
    "pod_override": k8s.V1Pod(
        spec=k8s.V1PodSpec(
            containers=[
                k8s.V1Container(
                    name="transform",
                    resources=k8s.V1ResourceRequirements(
                        requests={"memory": "8Gi", "cpu": "1000m"}
                    ),
                )
            ]
        )
    ),
}

@dag(
    default_args={
        "start_date": datetime.datetime(2023, 1, 1, 0, 0),
        "owner": "Noel Gomez",
        "email": "gomezn@example.com",
        "email_on_failure": True,
    },
    description="Sample DAG with custom resources",
    schedule="0 0 1 */12 *",
    tags=["version_2"],
    catchup=False,
)
def request_resources_dag():
    transform_task = DatacovesBashOperator(
        task_id="transform", 
        executor_config=TRANSFORM_CONFIG
    )

dag = request_resources_dag()

YAML version

In the yml DAG you can configure the memory and cpu resources.

description: "Sample DAG with custom resources"
schedule_interval: "0 0 1 */12 *"
tags:
  - version_2
default_args:
  start_date: 2023-01-01
  owner: Noel Gomez
  email: gomezn@example.com
  email_on_failure: true
catchup: false

# DAG Tasks
nodes:
  transform:
    operator: operators.datacoves.bash.DatacovesBashOperator
    type: task
    config:
      resources:
        memory: 8Gi
        cpu: 1000m