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airflow.exceptions

Exceptions used by Airflow

Module Contents

Classes

FileSyntaxError

Information about a single error in a file.

exception airflow.exceptions.AirflowException

Bases: Exception

Base class for all Airflow’s errors.

Each custom exception should be derived from this class.

status_code

exception airflow.exceptions.AirflowBadRequest

Bases: AirflowException

Raise when the application or server cannot handle the request.

status_code

exception airflow.exceptions.AirflowNotFoundException

Bases: AirflowException

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

status_code

exception airflow.exceptions.AirflowConfigException

Bases: AirflowException

Raise when there is configuration problem.

exception airflow.exceptions.AirflowSensorTimeout

Bases: AirflowException

Raise when there is a timeout on sensor polling.

exception airflow.exceptions.AirflowRescheduleException(reschedule_date)

Bases: AirflowException

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

Parameters

reschedule_date – The date when the task should be rescheduled

exception airflow.exceptions.AirflowSmartSensorException

Bases: AirflowException

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

It should exit without failing a task.

exception airflow.exceptions.InvalidStatsNameException

Bases: AirflowException

Raise when name of the stats is invalid.

exception airflow.exceptions.AirflowTaskTimeout

Bases: AirflowException

Raise when the task execution times-out.

exception airflow.exceptions.AirflowWebServerTimeout

Bases: AirflowException

Raise when the web server times out.

exception airflow.exceptions.AirflowSkipException

Bases: AirflowException

Raise when the task should be skipped

exception airflow.exceptions.AirflowFailException

Bases: AirflowException

Raise when the task should be failed without retrying.

exception airflow.exceptions.AirflowOptionalProviderFeatureException

Bases: AirflowException

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

exception airflow.exceptions.UnmappableOperator

Bases: AirflowException

Raise when an operator is not implemented to be mappable.

exception airflow.exceptions.XComForMappingNotPushed

Bases: AirflowException

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

__str__()

Return str(self).

exception airflow.exceptions.UnmappableXComTypePushed(value)

Bases: AirflowException

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

__str__()

Return str(self).

exception airflow.exceptions.UnmappableXComLengthPushed(value, max_length)

Bases: AirflowException

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

__str__()

Return str(self).

exception airflow.exceptions.AirflowDagCycleException

Bases: AirflowException

Raise when there is a cycle in DAG definition.

exception airflow.exceptions.AirflowDagDuplicatedIdException(dag_id, incoming, existing)

Bases: AirflowException

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

__str__()

Return str(self).

exception airflow.exceptions.AirflowDagInconsistent

Bases: AirflowException

Raise when a DAG has inconsistent attributes.

exception airflow.exceptions.AirflowClusterPolicyViolation

Bases: AirflowException

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

exception airflow.exceptions.AirflowTimetableInvalid

Bases: AirflowException

Raise when a DAG has an invalid timetable.

exception airflow.exceptions.DagNotFound

Bases: AirflowNotFoundException

Raise when a DAG is not available in the system.

exception airflow.exceptions.DagCodeNotFound

Bases: AirflowNotFoundException

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

exception airflow.exceptions.DagRunNotFound

Bases: AirflowNotFoundException

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

exception airflow.exceptions.DagRunAlreadyExists

Bases: AirflowBadRequest

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

exception airflow.exceptions.DagFileExists(*args, **kwargs)

Bases: AirflowBadRequest

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

exception airflow.exceptions.DuplicateTaskIdFound

Bases: AirflowException

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

exception airflow.exceptions.TaskAlreadyInTaskGroup(task_id, existing_group_id, new_group_id)

Bases: AirflowException

Raise when a Task cannot be added to a TaskGroup since it already belongs to another TaskGroup.

__str__()

Return str(self).

exception airflow.exceptions.SerializationError

Bases: AirflowException

A problem occurred when trying to serialize a DAG.

exception airflow.exceptions.ParamValidationError

Bases: AirflowException

Raise when DAG params is invalid

exception airflow.exceptions.TaskNotFound

Bases: AirflowNotFoundException

Raise when a Task is not available in the system.

exception airflow.exceptions.TaskInstanceNotFound

Bases: AirflowNotFoundException

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

exception airflow.exceptions.PoolNotFound

Bases: AirflowNotFoundException

Raise when a Pool is not available in the system.

exception airflow.exceptions.NoAvailablePoolSlot

Bases: AirflowException

Raise when there is not enough slots in pool.

exception airflow.exceptions.DagConcurrencyLimitReached

Bases: AirflowException

Raise when DAG max_active_tasks limit is reached.

exception airflow.exceptions.TaskConcurrencyLimitReached

Bases: AirflowException

Raise when task max_active_tasks limit is reached.

exception airflow.exceptions.BackfillUnfinished(message, ti_status)

Bases: AirflowException

Raises when not all tasks succeed in backfill.

Parameters

• message – The human-readable description of the exception

• ti_status – The information about all task statuses

class airflow.exceptions.FileSyntaxError

Bases: NamedTuple

Information about a single error in a file.

line_no :Optional[int]

message :str

__str__()

Return str(self).

exception airflow.exceptions.AirflowFileParseException(msg, file_path, parse_errors)

Bases: AirflowException

Raises when connection or variable file can not be parsed.

Parameters

• msg (str) – The human-readable description of the exception

• file_path (str) – A processed file that contains errors

• parse_errors (List[FileSyntaxError]) – File syntax errors

__str__()

Return str(self).

exception airflow.exceptions.ConnectionNotUnique

Bases: AirflowException

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

exception airflow.exceptions.TaskDeferred(*, trigger, method_name, kwargs=None, timeout=None)

Bases: BaseException

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

__repr__()

Return repr(self).

exception airflow.exceptions.TaskDeferralError

Bases: AirflowException

Raised when a task failed during deferral for some reason.

exception airflow.exceptions.PodReconciliationError

Bases: AirflowException

Raised when an error is encountered while trying to merge pod configs.

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