Question

我一直在尝试创建示例DAG。测试在命令行上运行良好，但是当我从控制台触发相同的DAG时，它将永远保持运行状态。这是下面的代码供参考。帮助将不胜感激。我真的不明白为什么会陷入运行状态。另外，当我从控制台手动触发dag时，气流调度程序也不会显示任何输出。

from datetime import timedelta
import airflow
from airflow import DAG
from airflow.operators.bash_operator import BashOperator
from datetime import datetime, timedelta
from airflow.hooks import HttpHook
from airflow.contrib.operators.ssh_operator import SSHOperator

default_args = {
    'owner': 'Airflow',
    'depends_on_past': False,
    'start_date': airflow.utils.dates.days_ago(2),
    'email': ['airflow@example.com'],
    'email_on_failure': False,
    'email_on_retry': False,
    'retries': 1,
    'retry_delay': timedelta(minutes=5),
}

dag = DAG(
    'flow',
    default_args=default_args,
    description='A simple tutorial DAG',
    schedule_interval=timedelta(days=1),
)

node_bash = """
pwd
"""


t1 = SSHOperator(
     ssh_conn_id='datalakefs',
     task_id='loadfstodb',
     command=node_bash,
     dag=dag)

t1

这是测试命令的输出。

sudo airflow test flow loadfstodb 28-02-2020
[2020-02-28 10:50:53,602] {settings.py:254} INFO - settings.configure_orm(): Using pool settings. pool_size=5, max_overflow=10, pool_recycle=1800, pid=13429
[2020-02-28 10:50:54,090] {__init__.py:51} INFO - Using executor LocalExecutor
[2020-02-28 10:50:54,090] {dagbag.py:403} INFO - Filling up the DagBag from /home/airflow/dag
/usr/local/lib/python3.6/dist-packages/airflow/utils/helpers.py:439: DeprecationWarning: Importing 'HttpHook' directly from 'airflow.hooks' has been deprecated. Please import from 'airflow.hooks.[operator_module]' instead. Support for direct imports will be dropped entirely in Airflow 2.0.
  DeprecationWarning)
/usr/local/lib/python3.6/dist-packages/airflow/utils/helpers.py:439: DeprecationWarning: Importing 'PostgresHook' directly from 'airflow.hooks' has been deprecated. Please import from 'airflow.hooks.[operator_module]' instead. Support for direct imports will be dropped entirely in Airflow 2.0.
  DeprecationWarning)
[2020-02-28 10:50:54,354] {taskinstance.py:655} INFO - Dependencies all met for <TaskInstance: flow.loadfstodb 2020-02-28T00:00:00+00:00 [None]>
[2020-02-28 10:50:54,368] {taskinstance.py:655} INFO - Dependencies all met for <TaskInstance: flow.loadfstodb 2020-02-28T00:00:00+00:00 [None]>
[2020-02-28 10:50:54,369] {taskinstance.py:866} INFO -
--------------------------------------------------------------------------------
[2020-02-28 10:50:54,369] {taskinstance.py:867} INFO - Starting attempt 1 of 2
[2020-02-28 10:50:54,369] {taskinstance.py:868} INFO -
--------------------------------------------------------------------------------
[2020-02-28 10:50:54,371] {taskinstance.py:887} INFO - Executing <Task(SSHOperator): loadfstodb> on 2020-02-28T00:00:00+00:00
[2020-02-28 10:50:54,390] {ssh_operator.py:92} INFO - ssh_hook is not provided or invalid. Trying ssh_conn_id to create SSHHook.
[2020-02-28 10:50:54,421] {base_hook.py:84} INFO - Using connection to: id: datalakefs. Host: datalake, Port: None, Schema: None, Login: airflow, Password: XXXXXXXX, extra: XXXXXXXX
[2020-02-28 10:50:54,422] {ssh_hook.py:166} WARNING - Remote Identification Change is not verified. This wont protect against Man-In-The-Middle attacks
[2020-02-28 10:50:54,424] {ssh_hook.py:170} WARNING - No Host Key Verification. This wont protect against Man-In-The-Middle attacks
[2020-02-28 10:50:54,431] {transport.py:1572} INFO - Connected (version 2.0, client OpenSSH_7.6p1)
[2020-02-28 10:50:54,543] {transport.py:1572} INFO - Authentication (publickey) successful!
[2020-02-28 10:50:54,543] {ssh_operator.py:109} INFO - Running command:
pwd
[2020-02-28 10:50:55,760] {ssh_operator.py:143} INFO - /home/airflow

Answer 1

这是因为气流调度程序会间隔更新其dags，并且需要一些时间等待调度程序知道新dag的加入。

由于最初的运行，它一直被卡住，这是因为postgres的“作业”表中有一个条目。然后，我必须删除与Job相关的特定条目，然后重新启动DAG。而且有效。

DAG不会从控制台触发

1 个答案: