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Apache Spark Operators
======================

Prerequisite
------------

* To use :class:`~airflow.providers.apache.spark.operators.spark_submit.SparkSubmitOperator`
  you must configure :doc:`Spark Connection <connections/spark-submit>`.
* To use :class:`~airflow.providers.apache.spark.operators.spark_jdbc.SparkJDBCOperator`
  you must configure both :doc:`Spark Connection <connections/spark-submit>`
  and :doc:`JDBC connection <apache-airflow-providers-jdbc:connections/jdbc>`.
* :class:`~airflow.providers.apache.spark.operators.spark_sql.SparkSqlOperator`
  gets all the configurations from operator parameters.
* To use :class:`~airflow.providers.apache.spark.operators.spark_pyspark.PySparkOperator`
  you can configure :doc:`SparkConnect Connection <connections/spark-connect>`.
* To use :class:`~airflow.providers.apache.spark.operators.spark_pipelines.SparkPipelinesOperator`
  you must configure :doc:`Spark Connection <connections/spark-submit>` and have the ``spark-pipelines`` CLI available.

.. _howto/operator:SparkJDBCOperator:

SparkJDBCOperator
-----------------

Launches applications on a Apache Spark server, it uses ``SparkSubmitOperator`` to perform data transfers to/from JDBC-based databases.

For parameter definition take a look at :class:`~airflow.providers.apache.spark.operators.spark_jdbc.SparkJDBCOperator`.

Using the operator
""""""""""""""""""

Using ``cmd_type`` parameter, is possible to transfer data from Spark to a database (``spark_to_jdbc``) or from a database to Spark (``jdbc_to_spark``), which will write the table using the Spark command ``saveAsTable``.

.. exampleinclude:: /../tests/system/apache/spark/example_spark_dag.py
    :language: python
    :dedent: 4
    :start-after: [START howto_operator_spark_jdbc]
    :end-before: [END howto_operator_spark_jdbc]


Reference
"""""""""

For further information, look at `Apache Spark DataFrameWriter documentation <https://spark.apache.org/docs/2.4.5/api/scala/index.html#org.apache.spark.sql.DataFrameWriter>`_.

.. _howto/operator:PySparkOperator:

PySparkOperator
----------------

Launches applications on a Apache Spark Connect server or directly in a standalone mode

For parameter definition take a look at :class:`~airflow.providers.apache.spark.operators.spark_pyspark.PySparkOperator`.

Using the operator
""""""""""""""""""

.. exampleinclude:: /../tests/system/apache/spark/example_spark_dag.py
    :language: python
    :dedent: 4
    :start-after: [START howto_operator_spark_pyspark]
    :end-before: [END howto_operator_spark_pyspark]

Reference
"""""""""

For further information, look at `Running the Spark Connect Python <https://spark.apache.org/docs/latest/api/python/getting_started/quickstart_connect.html>`_.

.. _howto/operator:SparkPipelinesOperator:

SparkPipelinesOperator
----------------------

Execute Spark Declarative Pipelines using the ``spark-pipelines`` CLI. This operator wraps the spark-pipelines binary to execute declarative data pipelines, supporting both pipeline execution and validation through dry-runs.

For parameter definition take a look at :class:`~airflow.providers.apache.spark.operators.spark_pipelines.SparkPipelinesOperator`.

Using the operator
""""""""""""""""""

The operator can be used to run declarative pipelines:

.. code-block:: python

   from airflow.providers.apache.spark.operators.spark_pipelines import SparkPipelinesOperator

   # Execute the pipeline
   run_pipeline = SparkPipelinesOperator(
       task_id="run_pipeline",
       pipeline_spec="/path/to/pipeline.yml",
       pipeline_command="run",
       conn_id="spark_default",
       num_executors=2,
       executor_cores=4,
       executor_memory="2G",
       driver_memory="1G",
   )

**Pipeline Specification**

The ``pipeline_spec`` parameter should point to a YAML file defining your declarative pipeline:

.. code-block:: yaml

   name: my_pipeline
   storage: file:///path/to/pipeline-storage
   libraries:
     - glob:
         include: transformations/**

**Pipeline Commands**

* ``run`` - Execute the pipeline (default)
* ``dry-run`` - Validate the pipeline without execution

Reference
"""""""""

For further information, look at `Spark Declarative Pipelines Programming Guide <https://spark.apache.org/docs/latest/declarative-pipelines-programming-guide.html>`_.

.. _howto/operator:SparkSqlOperator:

SparkSqlOperator
----------------

Launches applications on a Apache Spark server, it requires that the ``spark-sql`` script is in the PATH.
The operator will run the SQL query on Spark Hive metastore service, the ``sql`` parameter can be templated and be a ``.sql`` or ``.hql`` file.

For parameter definition take a look at :class:`~airflow.providers.apache.spark.operators.spark_sql.SparkSqlOperator`.

Using the operator
""""""""""""""""""

.. exampleinclude:: /../tests/system/apache/spark/example_spark_dag.py
    :language: python
    :dedent: 4
    :start-after: [START howto_operator_spark_sql]
    :end-before: [END howto_operator_spark_sql]

Reference
"""""""""

For further information, look at `Running the Spark SQL CLI <https://spark.apache.org/docs/latest/sql-distributed-sql-engine.html#running-the-spark-sql-cli>`_.

.. _howto/operator:SparkSubmitOperator:

SparkSubmitOperator
-------------------

Launches applications on a Apache Spark server, it uses the ``spark-submit`` script that takes care of setting up the classpath with Spark and its dependencies, and can support different cluster managers and deploy modes that Spark supports.

For parameter definition take a look at :class:`~airflow.providers.apache.spark.operators.spark_submit.SparkSubmitOperator`.

Using the operator
""""""""""""""""""

.. exampleinclude:: /../tests/system/apache/spark/example_spark_dag.py
    :language: python
    :dedent: 4
    :start-after: [START howto_operator_spark_submit]
    :end-before: [END howto_operator_spark_submit]

Reference
"""""""""

For further information, look at `Apache Spark submitting applications <https://spark.apache.org/docs/latest/submitting-applications.html>`_.

Cluster mode crash recovery (Spark standalone)
"""""""""""""""""""""""""""""""""""""""""""""""

When running in Spark standalone cluster mode (``--deploy-mode cluster``), the Spark driver runs
independently on the cluster. If the Airflow worker dies while the Spark job is running, the driver keeps running but
Airflow loses track of it and the behaviour to submit a brand new job would be wasting
the compute already done or even cause conflicts if the Spark job itself is not designed to be idempotent.

Now, the ``SparkSubmitOperator`` solves this by persisting the driver ID to ``task_state_store`` immediately after
submission. On retry, it reads the ID back and reconnects to the already-running driver instead of
resubmitting.

This is the **synchronous path** — the worker holds a slot for the duration of polling. This is
a crash-safety net for teams running sync operators for log observability, org constraints, or
because a Triggerer is not available. Teams with a Triggerer available may also consider
deferrable operators, which free the worker slot but may come with added complexity.

**Connection requirements for crash recovery**

The reconnection polling calls the Spark standalone REST API
(``GET /v1/submissions/status/{driverId}``). Make sure the Spark connection's
``REST scheme`` and ``REST port`` extras match your cluster's configuration:

* ``REST scheme`` — set to ``https`` if your cluster has TLS enabled on the REST port
  (``spark.ssl.standalone.enabled=true``). Defaults to ``http``.
* ``REST port`` — set to the value of ``spark.master.rest.port`` on your cluster. Defaults to ``6066``.

See :doc:`connections/spark-submit` for how to configure these fields.

.. note::
    Crash recovery in cluster mode requires Airflow 3.3+ (``task_state_store`` support). On earlier
    versions the operator falls back to the previous behavior of always submitting fresh.

Tracking driver status via Kubernetes API
""""""""""""""""""""""""""""""""""""""""""

When running in Kubernetes cluster mode, ``spark-submit`` blocks for the duration of the job.
The JVM runs processes which does nothing but polling of the pod phase and holds heap space for
the entire duration. This is not ideal for long-running jobs, especially when the driver is idle
for long periods (e.g. waiting for data or user input).

Set ``track_driver_via_k8s_api=True`` to have the operator track the driver pod status via the
Python Kubernetes client rather than holding ``spark-submit`` open for the full job duration:

.. code-block:: python

   from airflow.providers.apache.spark.operators.spark_submit import SparkSubmitOperator

   run_spark = SparkSubmitOperator(
       task_id="run_spark",
       application="local:///opt/spark/examples/jars/spark-examples.jar",
       conn_id="spark_k8s",
       deploy_mode="cluster",
       track_driver_via_k8s_api=True,
       durable=True,
   )

**Requirements**

* The Spark connection ``master`` must be ``k8s://...`` and ``deploy_mode`` must be ``cluster``.
* Do not set ``spark.kubernetes.submission.waitAppCompletion=true`` in your ``conf`` — this
  conflicts with the flag and a ``ValueError`` will be raised at task start.
* The Airflow worker must be able to reach the Kubernetes API server and have permission to
  read and delete pods in the driver's namespace; otherwise pod tracking and cleanup will fail.
* Set ``durable=True`` (the default) to enable crash recovery: the driver pod name is
  persisted to task state before polling begins, so a worker crash and retry reconnects to the
  existing pod instead of submitting a fresh one. Set ``durable=False`` to always
  submit a fresh driver on retry.
* Pod completion is detected from ``pod.status.phase``. If your driver pods have sidecar
  containers (e.g. Istio injection enabled for the driver namespace), the pod phase may not
  advance to ``Succeeded`` until all sidecars exit. In that case the poll loop will wait
  indefinitely — set ``execution_timeout`` as a hard bound.

YARN ResourceManager API tracking
"""""""""""""""""""""""""""""""""

When running Spark applications on YARN in cluster deploy mode, the default Spark submit path keeps
the local ``spark-submit`` JVM alive on the Airflow worker while the YARN
application runs. For long-running Spark applications this can keep worker memory tied up for the
whole application lifetime.

Set ``yarn_track_via_rm_api=True`` to release the local ``spark-submit`` JVM after YARN accepts the
application, then poll the YARN ResourceManager REST API until the application reaches a terminal
state. The ResourceManager API polling interval is controlled by ``status_poll_interval`` with a
minimum of 10 seconds.

This mode requires the Spark connection extra to set ``yarn_resourcemanager_webapp_address`` before
the application is submitted:

.. code-block:: bash

    airflow connections add spark_yarn_rm \
        --conn-type spark \
        --conn-host yarn \
        --conn-extra '{
            "deploy-mode": "cluster",
            "yarn_resourcemanager_webapp_address": "http://rm.example.com:8088"
        }'

.. code-block:: python

    SparkSubmitOperator(
        task_id="spark_pi",
        conn_id="spark_yarn_rm",
        application="/path/to/spark-examples.jar",
        java_class="org.apache.spark.examples.SparkPi",
        deploy_mode="cluster",
        yarn_track_via_rm_api=True,
    )

For Kerberized clusters, install ``requests-kerberos`` in the Airflow environment. When the
Spark connection has both ``keytab`` and ``principal`` configured, Airflow automatically uses
``HTTPKerberosAuth()`` for the ResourceManager REST requests.

Use ``yarn_rm_auth`` only when the ResourceManager needs a custom ``requests`` authentication
object:

.. code-block:: python

    import requests

    SparkSubmitOperator(
        task_id="spark_pi",
        conn_id="spark_yarn_rm",
        application="/path/to/spark-examples.jar",
        java_class="org.apache.spark.examples.SparkPi",
        deploy_mode="cluster",
        yarn_track_via_rm_api=True,
        yarn_rm_auth=requests.auth.HTTPBasicAuth("user", "password"),
    )
