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Airflow demo: add patch file for stress testing (#291)
* add patch file for stress testing * added patch section * updated docs * Update docs/modules/demos/pages/airflow-scheduled-job.adoc Co-authored-by: Xenia <[email protected]> * Update docs/modules/demos/pages/airflow-scheduled-job.adoc Co-authored-by: Xenia <[email protected]> * review feedback comments --------- Co-authored-by: Xenia <[email protected]>
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‎docs/modules/demos/pages/airflow-scheduled-job.adoc‎

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@@ -129,6 +129,65 @@ asynchronously - and another to poll the running job to report on its status.
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image::airflow-scheduled-job/airflow_11.png[]
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== Patching Airflow to stress-test DAG parsing using relevant environment variables
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The demo also created a third DAG in the ConfigMap, called `dag_factory.py`, which was not mounted to the cluster and therefore does not appear in the UI.
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This DAG can be used to create a number of individual DAGs on-the-fly, thus allowing a certain degree of stress-testing of the DAG scan/register steps (the generated DAGs themselves are trivial and so this approach will not really increase the burden of DAG _parsing_).
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To include this in the list of DAGs (without removing the existing ones), an extra volumeMount is needed, as shown below.
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The patch also sets some environment variables that can be used to change the frequency of certain operations. The descriptions can be found here: https://airflow.apache.org/docs/apache-airflow/stable/configurations-ref.html[window=_blank].
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[source,yaml]
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----
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---
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apiVersion: airflow.stackable.tech/v1alpha1
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kind: AirflowCluster
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metadata:
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name: airflow
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spec:
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clusterConfig:
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volumeMounts:
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- name: airflow-dags
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mountPath: /dags/dag_factory.py
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subPath: dag_factory.py
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- name: airflow-dags
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mountPath: /dags/date_demo.py
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subPath: date_demo.py
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- name: airflow-dags
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mountPath: /dags/pyspark_pi.py
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subPath: pyspark_pi.py
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- name: airflow-dags
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mountPath: /dags/pyspark_pi.yaml
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subPath: pyspark_pi.yaml
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webservers:
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roleGroups:
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default:
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envOverrides: &envOverrides
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AIRFLOW__CORE__DAGS_FOLDER: "/dags"
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AIRFLOW__CORE__MIN_SERIALIZED_DAG_UPDATE_INTERVAL: "60"
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AIRFLOW__CORE__MIN_SERIALIZED_DAG_FETCH_INTERVAL: "60"
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AIRFLOW__DAG_PROCESSOR__MIN_FILE_PROCESS_INTERVAL: "60"
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AIRFLOW__DAG_PROCESSOR__PRINT_STATS_INTERVAL: "60"
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AIRFLOW_CONN_KUBERNETES_IN_CLUSTER: "kubernetes://?__extra__=%7B%22extra__kubernetes__in_cluster%22%3A+true%2C+%22extra__kubernetes__kube_config%22%3A+%22%22%2C+%22extra__kubernetes__kube_config_path%22%3A+%22%22%2C+%22extra__kubernetes__namespace%22%3A+%22%22%7D"
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kubernetesExecutors:
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envOverrides: *envOverrides
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schedulers:
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roleGroups:
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default:
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envOverrides: *envOverrides
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----
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THe patch can be applied like this:
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[source,console]
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----
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kubectl patch airflowcluster airflow --type="merge" --patch-file stacks/airflow/patch_airflow.yaml
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----
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[NOTE]
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====
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The scheduled job runs every minute and so an instance of it may be running while the scheduler is being re-started as a result of the patch, in which case that instance may fail.
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====
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== Summary
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This demo showed how DAGs can be made available for Airflow, scheduled, run and then inspected with the Webserver UI.

‎stacks/_templates/redis-airflow.yaml‎

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‎stacks/airflow/airflow.yaml‎

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gracefulShutdownTimeout: 30s
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roleGroups:
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default:
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envOverrides:
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envOverrides: &envOverrides
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AIRFLOW__CORE__DAGS_FOLDER: "/dags"
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AIRFLOW_CONN_KUBERNETES_IN_CLUSTER: "kubernetes://?__extra__=%7B%22extra__kubernetes__in_cluster%22%3A+true%2C+%22extra__kubernetes__kube_config%22%3A+%22%22%2C+%22extra__kubernetes__kube_config_path%22%3A+%22%22%2C+%22extra__kubernetes__namespace%22%3A+%22%22%7D"
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replicas: 1
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kubernetesExecutors:
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envOverrides:
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AIRFLOW__CORE__DAGS_FOLDER: "/dags"
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AIRFLOW_CONN_KUBERNETES_IN_CLUSTER: "kubernetes://?__extra__=%7B%22extra__kubernetes__in_cluster%22%3A+true%2C+%22extra__kubernetes__kube_config%22%3A+%22%22%2C+%22extra__kubernetes__kube_config_path%22%3A+%22%22%2C+%22extra__kubernetes__namespace%22%3A+%22%22%7D"
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envOverrides: *envOverrides
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schedulers:
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config:
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gracefulShutdownTimeout: 30s
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limit: 1Gi
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roleGroups:
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default:
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envOverrides:
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AIRFLOW__CORE__DAGS_FOLDER: "/dags"
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AIRFLOW_CONN_KUBERNETES_IN_CLUSTER: "kubernetes://?__extra__=%7B%22extra__kubernetes__in_cluster%22%3A+true%2C+%22extra__kubernetes__kube_config%22%3A+%22%22%2C+%22extra__kubernetes__kube_config_path%22%3A+%22%22%2C+%22extra__kubernetes__namespace%22%3A+%22%22%7D"
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envOverrides: *envOverrides
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replicas: 1
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---
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apiVersion: v1
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tags=['example'],
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params={},
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) as dag:
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run_this = BashOperator(
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task_id='run_every_minute',
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bash_command='date',
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)
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dag_factory.py: |
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from airflow import DAG
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from airflow.operators.empty import EmptyOperator
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from datetime import datetime, timedelta
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# Number of DAGs to generate
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NUM_DAGS = 10 # Increase for more stress
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DAG_PREFIX = "stress_dag_"
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default_args = {
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'owner': 'airflow',
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'start_date': datetime(2025, 1, 1),
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'retries': 1,
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'retry_delay': timedelta(seconds=5),
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}
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def create_dag(dag_id):
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with DAG(
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dag_id=dag_id,
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default_args=default_args,
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schedule=None,
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catchup=False,
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tags=["stress_test"],
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) as dag:
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start = EmptyOperator(task_id='start')
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end = EmptyOperator(task_id='end')
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start >> end
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return dag
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for i in range(NUM_DAGS):
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dag_id = f"{DAG_PREFIX}{i:04d}"
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globals()[dag_id] = create_dag(dag_id)
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pyspark_pi.py: |
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"""Example DAG demonstrating how to apply a Kubernetes Resource from Airflow running in-cluster"""
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from datetime import datetime, timedelta
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adminUser.password: "{{ airflowAdminPassword }}"
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connections.secretKey: "{{ airflowSecretKey }}"
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connections.sqlalchemyDatabaseUri: postgresql+psycopg2://airflow:airflow@postgresql-airflow/airflow
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connections.celeryResultBackend: db+postgresql://airflow:airflow@postgresql-airflow/airflow
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connections.celeryBrokerUrl: redis://:airflow@redis-airflow-master:6379/0

‎stacks/airflow/patch_airflow.yaml‎

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---
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apiVersion: airflow.stackable.tech/v1alpha1
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kind: AirflowCluster
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metadata:
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name: airflow
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spec:
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clusterConfig:
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volumeMounts:
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- name: airflow-dags
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mountPath: /dags/dag_factory.py
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subPath: dag_factory.py
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- name: airflow-dags
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mountPath: /dags/date_demo.py
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subPath: date_demo.py
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- name: airflow-dags
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mountPath: /dags/pyspark_pi.py
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subPath: pyspark_pi.py
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- name: airflow-dags
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mountPath: /dags/pyspark_pi.yaml
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subPath: pyspark_pi.yaml
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webservers:
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roleGroups:
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default:
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envOverrides: &envOverrides
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AIRFLOW__CORE__DAGS_FOLDER: "/dags"
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AIRFLOW__CORE__MIN_SERIALIZED_DAG_UPDATE_INTERVAL: "60"
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AIRFLOW__CORE__MIN_SERIALIZED_DAG_FETCH_INTERVAL: "60"
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AIRFLOW__DAG_PROCESSOR__MIN_FILE_PROCESS_INTERVAL: "60"
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AIRFLOW__DAG_PROCESSOR__PRINT_STATS_INTERVAL: "60"
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AIRFLOW_CONN_KUBERNETES_IN_CLUSTER: "kubernetes://?__extra__=%7B%22extra__kubernetes__in_cluster%22%3A+true%2C+%22extra__kubernetes__kube_config%22%3A+%22%22%2C+%22extra__kubernetes__kube_config_path%22%3A+%22%22%2C+%22extra__kubernetes__namespace%22%3A+%22%22%7D"
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kubernetesExecutors:
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envOverrides: *envOverrides
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schedulers:
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roleGroups:
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default:
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envOverrides: *envOverrides

‎stacks/stacks-v2.yaml‎

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- airflow
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manifests:
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- helmChart: https://raw.githubusercontent.com/stackabletech/demos/main/stacks/_templates/postgresql-airflow.yaml
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- helmChart: https://raw.githubusercontent.com/stackabletech/demos/main/stacks/_templates/redis-airflow.yaml
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- plainYaml: https://raw.githubusercontent.com/stackabletech/demos/main/stacks/airflow/airflow.yaml
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supportedNamespaces: []
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resourceRequests:

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