droppoint commented on code in PR #35800:
URL: https://github.com/apache/airflow/pull/35800#discussion_r1433930848
##########
airflow/providers/cncf/kubernetes/executors/kubernetes_executor.py:
##########
@@ -642,38 +642,37 @@ def adopt_launched_task(
del tis_to_flush_by_key[ti_key]
self.running.add(ti_key)
- def _adopt_completed_pods(self, kube_client: client.CoreV1Api) -> None:
+ @provide_session
+ def _delete_orphaned_completed_pods(self, session: Session = NEW_SESSION)
-> None:
"""
- Patch completed pods so that the KubernetesJobWatcher can delete them.
+ Delete orphaned completed pods with completed TaskInstances.
- :param kube_client: kubernetes client for speaking to kube API
+ Pods that have reached the Completed status are usually deleted by the
scheduler to which
+ they are attached. In case when the scheduler crashes, there is no one
to delete these
+ pods. Therefore, they are deleted from another scheduler using this
function.
"""
+ from airflow.jobs.job import Job, JobState
+
if TYPE_CHECKING:
- assert self.scheduler_job_id
+ assert self.kube_scheduler
- new_worker_id_label =
self._make_safe_label_value(self.scheduler_job_id)
- query_kwargs = {
- "field_selector": "status.phase=Succeeded",
- "label_selector": (
- "kubernetes_executor=True,"
-
f"airflow-worker!={new_worker_id_label},{POD_EXECUTOR_DONE_KEY}!=True"
- ),
- }
+ alive_schedulers_ids = session.scalars(
+ select(Job.id).where(Job.job_type == "SchedulerJob", Job.state ==
JobState.RUNNING)
+ ).all()
+ labels = ["kubernetes_executor=True", f"{POD_EXECUTOR_DONE_KEY}!=True"]
+ for alive_scheduler_id in alive_schedulers_ids:
+
labels.append(f"airflow-worker!={self._make_safe_label_value(str(alive_scheduler_id))}")
Review Comment:
Because in this case, you will delete/adopt completed pods from other
normally working schedulers. For example, consider a setup with 3 schedulers:
A, B, and C. Suppose scheduler A is down. When the 'adoption' procedure starts
in either scheduler B or scheduler C, they should adopt running and completed
pods from scheduler A but not from each other since they are working normally.
So if the label select has a label like 'airflow-worker!=<current scheduler
id>', you will delete/adopt pods that are not meant for adoption.
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