:py:mod:`airflow.exceptions`
============================

.. py:module:: airflow.exceptions

.. autoapi-nested-parse::

   Exceptions used by Airflow


Module Contents
---------------

Classes
~~~~~~~

.. autoapisummary::

   airflow.exceptions.FileSyntaxError


.. py:exception:: AirflowException

   Bases: :py:obj:`Exception`

   Base class for all Airflow's errors.

   Each custom exception should be derived from this class.

   .. py:attribute:: status_code
      :annotation: = 500

      
.. py:exception:: AirflowBadRequest

   Bases: :py:obj:`AirflowException`

   Raise when the application or server cannot handle the request.

   .. py:attribute:: status_code
      :annotation: = 400

      
.. py:exception:: AirflowNotFoundException

   Bases: :py:obj:`AirflowException`

   Raise when the requested object/resource is not available in the system.

   .. py:attribute:: status_code
      :annotation: = 404

      
.. py:exception:: AirflowConfigException

   Bases: :py:obj:`AirflowException`

   Raise when there is configuration problem.


.. py:exception:: AirflowSensorTimeout

   Bases: :py:obj:`AirflowException`

   Raise when there is a timeout on sensor polling.


.. py:exception:: AirflowRescheduleException(reschedule_date)

   Bases: :py:obj:`AirflowException`

   Raise when the task should be re-scheduled at a later time.

   :param reschedule_date: The date when the task should be rescheduled


.. py:exception:: AirflowSmartSensorException

   Bases: :py:obj:`AirflowException`

   Raise after the task register itself in the smart sensor service.

   It should exit without failing a task.


.. py:exception:: InvalidStatsNameException

   Bases: :py:obj:`AirflowException`

   Raise when name of the stats is invalid.


.. py:exception:: AirflowTaskTimeout

   Bases: :py:obj:`AirflowException`

   Raise when the task execution times-out.


.. py:exception:: AirflowWebServerTimeout

   Bases: :py:obj:`AirflowException`

   Raise when the web server times out.


.. py:exception:: AirflowSkipException

   Bases: :py:obj:`AirflowException`

   Raise when the task should be skipped


.. py:exception:: AirflowFailException

   Bases: :py:obj:`AirflowException`

   Raise when the task should be failed without retrying.


.. py:exception:: AirflowOptionalProviderFeatureException

   Bases: :py:obj:`AirflowException`

   Raise by providers when imports are missing for optional provider features.


.. py:exception:: UnmappableOperator

   Bases: :py:obj:`AirflowException`

   Raise when an operator is not implemented to be mappable.


.. py:exception:: XComForMappingNotPushed

   Bases: :py:obj:`AirflowException`

   Raise when a mapped downstream's dependency fails to push XCom for task mapping.

   .. py:method:: __str__(self)

      Return str(self).


.. py:exception:: UnmappableXComTypePushed(value)

   Bases: :py:obj:`AirflowException`

   Raise when an unmappable type is pushed as a mapped downstream's dependency.

   .. py:method:: __str__(self)

      Return str(self).


.. py:exception:: UnmappableXComLengthPushed(value, max_length)

   Bases: :py:obj:`AirflowException`

   Raise when the pushed value is too large to map as a downstream's dependency.

   .. py:method:: __str__(self)

      Return str(self).


.. py:exception:: AirflowDagCycleException

   Bases: :py:obj:`AirflowException`

   Raise when there is a cycle in DAG definition.


.. py:exception:: AirflowDagDuplicatedIdException(dag_id, incoming, existing)

   Bases: :py:obj:`AirflowException`

   Raise when a DAG's ID is already used by another DAG.

   .. py:method:: __str__(self)

      Return str(self).


.. py:exception:: AirflowClusterPolicyViolation

   Bases: :py:obj:`AirflowException`

   Raise when there is a violation of a Cluster Policy in DAG definition.


.. py:exception:: AirflowTimetableInvalid

   Bases: :py:obj:`AirflowException`

   Raise when a DAG has an invalid timetable.


.. py:exception:: DagNotFound

   Bases: :py:obj:`AirflowNotFoundException`

   Raise when a DAG is not available in the system.


.. py:exception:: DagCodeNotFound

   Bases: :py:obj:`AirflowNotFoundException`

   Raise when a DAG code is not available in the system.


.. py:exception:: DagRunNotFound

   Bases: :py:obj:`AirflowNotFoundException`

   Raise when a DAG Run is not available in the system.


.. py:exception:: DagRunAlreadyExists

   Bases: :py:obj:`AirflowBadRequest`

   Raise when creating a DAG run for DAG which already has DAG run entry.


.. py:exception:: DagFileExists(*args, **kwargs)

   Bases: :py:obj:`AirflowBadRequest`

   Raise when a DAG ID is still in DagBag i.e., DAG file is in DAG folder.


.. py:exception:: DuplicateTaskIdFound

   Bases: :py:obj:`AirflowException`

   Raise when a Task with duplicate task_id is defined in the same DAG.


.. py:exception:: SerializationError

   Bases: :py:obj:`AirflowException`

   A problem occurred when trying to serialize a DAG.


.. py:exception:: ParamValidationError

   Bases: :py:obj:`AirflowException`

   Raise when DAG params is invalid


.. py:exception:: TaskNotFound

   Bases: :py:obj:`AirflowNotFoundException`

   Raise when a Task is not available in the system.


.. py:exception:: TaskInstanceNotFound

   Bases: :py:obj:`AirflowNotFoundException`

   Raise when a task instance is not available in the system.


.. py:exception:: PoolNotFound

   Bases: :py:obj:`AirflowNotFoundException`

   Raise when a Pool is not available in the system.


.. py:exception:: NoAvailablePoolSlot

   Bases: :py:obj:`AirflowException`

   Raise when there is not enough slots in pool.


.. py:exception:: DagConcurrencyLimitReached

   Bases: :py:obj:`AirflowException`

   Raise when DAG max_active_tasks limit is reached.


.. py:exception:: TaskConcurrencyLimitReached

   Bases: :py:obj:`AirflowException`

   Raise when task max_active_tasks limit is reached.


.. py:exception:: BackfillUnfinished(message, ti_status)

   Bases: :py:obj:`AirflowException`

   Raises when not all tasks succeed in backfill.

   :param message: The human-readable description of the exception
   :param ti_status: The information about all task statuses


.. py:class:: FileSyntaxError

   Bases: :py:obj:`NamedTuple`

   Information about a single error in a file.

   .. py:attribute:: line_no
      :annotation: :Optional[int]

      
   .. py:attribute:: message
      :annotation: :str

      
   .. py:method:: __str__(self)

      Return str(self).


.. py:exception:: AirflowFileParseException(msg, file_path, parse_errors)

   Bases: :py:obj:`AirflowException`

   Raises when connection or variable file can not be parsed.

   :param msg: The human-readable description of the exception
   :param file_path: A processed file that contains errors
   :param parse_errors: File syntax errors

   .. py:method:: __str__(self)

      Return str(self).


.. py:exception:: ConnectionNotUnique

   Bases: :py:obj:`AirflowException`

   Raise when multiple values are found for the same connection ID.


.. py:exception:: TaskDeferred(*, trigger, method_name, kwargs = None, timeout = None)

   Bases: :py:obj:`BaseException`

   Special exception raised to signal that the operator it was raised from
   wishes to defer until a trigger fires.

   .. py:method:: __repr__(self)

      Return repr(self).


.. py:exception:: TaskDeferralError

   Bases: :py:obj:`AirflowException`

   Raised when a task failed during deferral for some reason.