airflow xcom_sidecar 源码
airflow xcom_sidecar 代码
文件路径：/airflow/providers/cncf/kubernetes/utils/xcom_sidecar.py
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"""
This module handles all xcom functionality for the KubernetesPodOperator
by attaching a sidecar container that blocks the pod from completing until
Airflow has pulled result data into the worker for xcom serialization.
"""
from __future__ import annotations
import copy
from kubernetes.client import models as k8s
class PodDefaults:
"""Static defaults for Pods"""
XCOM_MOUNT_PATH = '/airflow/xcom'
SIDECAR_CONTAINER_NAME = 'airflow-xcom-sidecar'
XCOM_CMD = 'trap "exit 0" INT; while true; do sleep 1; done;'
VOLUME_MOUNT = k8s.V1VolumeMount(name='xcom', mount_path=XCOM_MOUNT_PATH)
VOLUME = k8s.V1Volume(name='xcom', empty_dir=k8s.V1EmptyDirVolumeSource())
SIDECAR_CONTAINER = k8s.V1Container(
name=SIDECAR_CONTAINER_NAME,
command=['sh', '-c', XCOM_CMD],
image='alpine',
volume_mounts=[VOLUME_MOUNT],
resources=k8s.V1ResourceRequirements(
requests={
"cpu": "1m",
}
),
)
def add_xcom_sidecar(pod: k8s.V1Pod) -> k8s.V1Pod:
"""Adds sidecar"""
pod_cp = copy.deepcopy(pod)
pod_cp.spec.volumes = pod.spec.volumes or []
pod_cp.spec.volumes.insert(0, PodDefaults.VOLUME)
pod_cp.spec.containers[0].volume_mounts = pod_cp.spec.containers[0].volume_mounts or []
pod_cp.spec.containers[0].volume_mounts.insert(0, PodDefaults.VOLUME_MOUNT)
pod_cp.spec.containers.append(PodDefaults.SIDECAR_CONTAINER)
return pod_cp
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