OpenMetadata/openmetadata-docs/content/v1.7.x/getting-started/day-1/hybrid-saas/gcs-composer.md

title	slug	collate
Run the ingestion from GCS Composer	/getting-started/day-1/hybrid-saas/gcs-composer	true

{% partial file="/v1.7/deployment/external-ingestion.md" /%}

Run the ingestion from GCS Composer

Requirements

This approach has been last tested against:

• Composer version 2.5.4
• Airflow version 2.6.3

It also requires the ingestion package to be at least openmetadata-ingestion==1.3.1.0.

Using the Python Operator

The most comfortable way to run the metadata workflows from GCS Composer is directly via a PythonOperator. Note that it will require you to install the packages and plugins directly on the host.

Install the Requirements

In your environment you will need to install the following packages:

• openmetadata-ingestion[<plugins>]==x.y.z.
• sqlalchemy==1.4.27: This is needed to align OpenMetadata version with the Composer internal requirements.

Where x.y.z is the version of the OpenMetadata ingestion package. Note that the version needs to match the server version. If we are using the server at 1.1.0, then the ingestion package needs to also be 1.1.0.

The plugin parameter is a list of the sources that we want to ingest. An example would look like this openmetadata-ingestion[mysql,snowflake,s3]==1.1.0.

Prepare the DAG!

Note that this DAG is a usual connector DAG, just using the Airflow service with the Backend connection.

As an example of a DAG pushing data to OpenMetadata under Google SSO, we could have:

from datetime import timedelta

import yaml
from airflow import DAG

try:
    from airflow.operators.python import PythonOperator
except ModuleNotFoundError:
    from airflow.operators.python_operator import PythonOperator

from airflow.utils.dates import days_ago

from metadata.workflow.metadata import MetadataWorkflow

 

default_args = {
    "owner": "user_name",
    "email": ["username@org.com"],
    "email_on_failure": False,
    "retries": 3,
    "retry_delay": timedelta(minutes=5),
    "execution_timeout": timedelta(minutes=60),
}

CONFIG = """
...
"""


def metadata_ingestion_workflow():
    workflow_config = yaml.safe_load(CONFIG)
    workflow = MetadataWorkflow.create(workflow_config)
    workflow.execute()
    workflow.raise_from_status()
    workflow.print_status()
    workflow.stop()


with DAG(
    "airflow_metadata_extraction",
    default_args=default_args,
    description="An example DAG which pushes Airflow data to OM",
    start_date=days_ago(1),
    is_paused_upon_creation=True,
    schedule_interval="*/5 * * * *",
    catchup=False,
) as dag:
    ingest_task = PythonOperator(
        task_id="ingest_using_recipe",
        python_callable=metadata_ingestion_workflow,
    )

{% partial file="/v1.7/deployment/run-connectors-class.md" /%}

Using the Kubernetes Pod Operator

In this second approach we won't need to install absolutely anything to the GCS Composer environment. Instead, we will rely on the KubernetesPodOperator to use the underlying k8s cluster of Composer.

Then, the code won't directly run using the hosts' environment, but rather inside a container that we created with only the openmetadata-ingestion package.

Note: This approach only has the openmetadata/ingestion-base ready from version 0.12.1 or higher!

Prepare the DAG!

from datetime import datetime

from airflow import models
from airflow.providers.cncf.kubernetes.operators.kubernetes_pod import KubernetesPodOperator


CONFIG = """
...
"""


with models.DAG(
    "ingestion-k8s-operator",
    schedule_interval="@once",
    start_date=datetime(2021, 1, 1),
    catchup=False,
    tags=["OpenMetadata"],
) as dag:
    KubernetesPodOperator(
        task_id="ingest",
        name="ingest",
        cmds=["python", "main.py"],
        image="openmetadata/ingestion-base:0.13.2",
        namespace='default',
        env_vars={"config": CONFIG, "pipelineType": "metadata"},
        dag=dag,
    )

Some remarks on this example code:

Kubernetes Pod Operator

You can name the task as you want (task_id and name). The important points here are the cmds, this should not be changed, and the env_vars. The main.py script that gets shipped within the image will load the env vars as they are shown, so only modify the content of the config YAML, but not this dictionary.

Note that the example uses the image openmetadata/ingestion-base:0.13.2. Update that accordingly for higher version once they are released. Also, the image version should be aligned with your OpenMetadata server version to avoid incompatibilities.

KubernetesPodOperator(
    task_id="ingest",
    name="ingest",
    cmds=["python", "main.py"],
    image="openmetadata/ingestion-base:0.13.2",
    namespace='default',
    env_vars={"config": config, "pipelineType": "metadata"},
    dag=dag,
)

You can find more information about the KubernetesPodOperator and how to tune its configurations here.

Note that depending on the kind of workflow you will be deploying, the YAML configuration will need to updated following the official OpenMetadata docs, and the value of the pipelineType configuration will need to hold one of the following values:

• metadata
• usage
• lineage
• profiler
• TestSuite

Which are based on the PipelineType JSON Schema definitions