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from typing import Dict, List, Optional, Set, Union
from airflow.configuration import conf
from airflow.executors.base_executor import CommandType, EventBufferValueType, QueuedTaskInstanceType
from airflow.executors.celery_executor import CeleryExecutor
from airflow.executors.kubernetes_executor import KubernetesExecutor
from airflow.models.taskinstance import SimpleTaskInstance, TaskInstance, TaskInstanceKey
from airflow.utils.log.logging_mixin import LoggingMixin
[docs]class CeleryKubernetesExecutor(LoggingMixin):
"""
CeleryKubernetesExecutor consists of CeleryExecutor and KubernetesExecutor.
It chooses an executor to use based on the queue defined on the task.
When the queue is the value of ``kubernetes_queue`` in section ``[celery_kubernetes_executor]``
of the configuration (default value: `kubernetes`), KubernetesExecutor is selected to run the task,
otherwise, CeleryExecutor is used.
"""
[docs] KUBERNETES_QUEUE = conf.get('celery_kubernetes_executor', 'kubernetes_queue')
def __init__(self, celery_executor, kubernetes_executor):
super().__init__()
self._job_id: Optional[str] = None
self.celery_executor = celery_executor
self.kubernetes_executor = kubernetes_executor
@property
[docs] def queued_tasks(self) -> Dict[TaskInstanceKey, QueuedTaskInstanceType]:
"""Return queued tasks from celery and kubernetes executor"""
queued_tasks = self.celery_executor.queued_tasks.copy()
queued_tasks.update(self.kubernetes_executor.queued_tasks)
return queued_tasks
@property
[docs] def running(self) -> Set[TaskInstanceKey]:
"""Return running tasks from celery and kubernetes executor"""
return self.celery_executor.running.union(self.kubernetes_executor.running)
@property
[docs] def job_id(self):
"""
This is a class attribute in BaseExecutor but since this is not really an executor, but a wrapper
of executors we implement as property so we can have custom setter.
"""
return self._job_id
@job_id.setter
def job_id(self, value):
"""job_id is manipulated by SchedulerJob. We must propagate the job_id to wrapped executors."""
self._job_id = value
self.kubernetes_executor.job_id = value
self.celery_executor.job_id = value
[docs] def start(self) -> None:
"""Start celery and kubernetes executor"""
self.celery_executor.start()
self.kubernetes_executor.start()
@property
[docs] def slots_available(self):
"""Number of new tasks this executor instance can accept"""
return self.celery_executor.slots_available
[docs] def queue_command(
self,
task_instance: TaskInstance,
command: CommandType,
priority: int = 1,
queue: Optional[str] = None,
):
"""Queues command via celery or kubernetes executor"""
executor = self._router(task_instance)
self.log.debug("Using executor: %s for %s", executor.__class__.__name__, task_instance.key)
executor.queue_command(task_instance, command, priority, queue)
[docs] def queue_task_instance(
self,
task_instance: TaskInstance,
mark_success: bool = False,
pickle_id: Optional[str] = None,
ignore_all_deps: bool = False,
ignore_depends_on_past: bool = False,
ignore_task_deps: bool = False,
ignore_ti_state: bool = False,
pool: Optional[str] = None,
cfg_path: Optional[str] = None,
) -> None:
"""Queues task instance via celery or kubernetes executor"""
executor = self._router(SimpleTaskInstance(task_instance))
self.log.debug(
"Using executor: %s to queue_task_instance for %s", executor.__class__.__name__, task_instance.key
)
executor.queue_task_instance(
task_instance,
mark_success,
pickle_id,
ignore_all_deps,
ignore_depends_on_past,
ignore_task_deps,
ignore_ti_state,
pool,
cfg_path,
)
[docs] def has_task(self, task_instance: TaskInstance) -> bool:
"""
Checks if a task is either queued or running in either celery or kubernetes executor.
:param task_instance: TaskInstance
:return: True if the task is known to this executor
"""
return self.celery_executor.has_task(task_instance) or self.kubernetes_executor.has_task(
task_instance
)
[docs] def heartbeat(self) -> None:
"""Heartbeat sent to trigger new jobs in celery and kubernetes executor"""
self.celery_executor.heartbeat()
self.kubernetes_executor.heartbeat()
[docs] def get_event_buffer(self, dag_ids=None) -> Dict[TaskInstanceKey, EventBufferValueType]:
"""
Returns and flush the event buffer from celery and kubernetes executor
:param dag_ids: to dag_ids to return events for, if None returns all
:return: a dict of events
"""
cleared_events_from_celery = self.celery_executor.get_event_buffer(dag_ids)
cleared_events_from_kubernetes = self.kubernetes_executor.get_event_buffer(dag_ids)
return {**cleared_events_from_celery, **cleared_events_from_kubernetes}
[docs] def try_adopt_task_instances(self, tis: List[TaskInstance]) -> List[TaskInstance]:
"""
Try to adopt running task instances that have been abandoned by a SchedulerJob dying.
Anything that is not adopted will be cleared by the scheduler (and then become eligible for
re-scheduling)
:return: any TaskInstances that were unable to be adopted
:rtype: list[airflow.models.TaskInstance]
"""
celery_tis = []
kubernetes_tis = []
abandoned_tis = []
for ti in tis:
if ti.queue == self.KUBERNETES_QUEUE:
kubernetes_tis.append(ti)
else:
celery_tis.append(ti)
abandoned_tis.extend(self.celery_executor.try_adopt_task_instances(celery_tis))
abandoned_tis.extend(self.kubernetes_executor.try_adopt_task_instances(kubernetes_tis))
return abandoned_tis
[docs] def end(self) -> None:
"""End celery and kubernetes executor"""
self.celery_executor.end()
self.kubernetes_executor.end()
[docs] def terminate(self) -> None:
"""Terminate celery and kubernetes executor"""
self.celery_executor.terminate()
self.kubernetes_executor.terminate()
def _router(self, simple_task_instance: SimpleTaskInstance) -> Union[CeleryExecutor, KubernetesExecutor]:
"""
Return either celery_executor or kubernetes_executor
:param simple_task_instance: SimpleTaskInstance
:return: celery_executor or kubernetes_executor
:rtype: Union[CeleryExecutor, KubernetesExecutor]
"""
if simple_task_instance.queue == self.KUBERNETES_QUEUE:
return self.kubernetes_executor
return self.celery_executor
[docs] def debug_dump(self):
"""Called in response to SIGUSR2 by the scheduler"""
self.log.info("Dumping CeleryExecutor state")
self.celery_executor.debug_dump()
self.log.info("Dumping KubernetesExecutor state")
self.kubernetes_executor.debug_dump()