Airflow: how to delete a DAG?

问题

I have started the Airflow webserver and scheduled some dags. I can see the dags on web GUI.

How can I delete a particular DAG from being run and shown in web GUI? Is there an Airflow CLI command to do that?

I looked around but could not find an answer for a simple way of deleting a DAG once it has been loaded and scheduled.

回答1:

Edit 8/27/18 - Airflow 1.10 is now released on PyPI!

https://pypi.org/project/apache-airflow/1.10.0/

How to delete a DAG completely

We have this feature now in Airflow ≥ 1.10!

The PR #2199 (Jira: AIRFLOW-1002) adding DAG removal to Airflow has now been merged which allows fully deleting a DAG's entries from all of the related tables.

The core delete_dag(...) code is now part of the experimental API, and there are entrypoints available via the CLI and also via the REST API.

CLI:

airflow delete_dag my_dag_id

REST API (running webserver locally):

curl -X "DELETE" http://127.0.0.1:8080/api/experimental/dags/my_dag_id

Warning regarding the REST API: Ensure that your Airflow cluster uses authentication in production.

Installing / upgrading to Airflow 1.10 (current)

To upgrade, run either:

export SLUGIFY_USES_TEXT_UNIDECODE=yes

or:

export AIRFLOW_GPL_UNIDECODE=yes

Then:

pip install -U apache-airflow

Remember to check UPDATING.md first for the full details!

回答2:

This is my adapted code using PostgresHook with the default connection_id.

import sys
from airflow.hooks.postgres_hook import PostgresHook

dag_input = sys.argv[1]
hook=PostgresHook( postgres_conn_id= "airflow_db")

for t in ["xcom", "task_instance", "sla_miss", "log", "job", "dag_run", "dag" ]:
    sql="delete from {} where dag_id='{}'".format(t, dag_input)
    hook.run(sql, True)

回答3:

Not sure why Apache Airflow doesn't have an obvious and easy way to delete a DAG

Filed https://issues.apache.org/jira/browse/AIRFLOW-1002

回答4:

I just wrote a script that deletes everything related to a particular dag, but this is only for MySQL. You can write a different connector method if you are using PostgreSQL. Originally the commands where posted by Lance on https://groups.google.com/forum/#!topic/airbnb_airflow/GVsNsUxPRC0 I just put it in script. Hope this helps. Format: python script.py dag_id

import sys
import MySQLdb

dag_input = sys.argv[1]

query = {'delete from xcom where dag_id = "' + dag_input + '"',
        'delete from task_instance where dag_id = "' + dag_input + '"',
        'delete from sla_miss where dag_id = "' + dag_input + '"',
        'delete from log where dag_id = "' + dag_input + '"',
        'delete from job where dag_id = "' + dag_input + '"',
        'delete from dag_run where dag_id = "' + dag_input + '"',
        'delete from dag where dag_id = "' + dag_input + '"' }

def connect(query):
        db = MySQLdb.connect(host="hostname", user="username", passwd="password", db="database")
        cur = db.cursor()
        cur.execute(query)
        db.commit()
        db.close()
        return

for value in query:
        print value
        connect(value)

回答5:

DAG-s can be deleted in Airflow 1.10 but the process and sequence of actions must be right. There's an "egg and chicken problem" - if you delete DAG from frontend while the file is still there the DAG is reloaded (because the file is not deleted). If you delete the file first and refresh the page then DAG cannot be deleted from web gui any more. So the sequence of actions that let me delete a DAG from frontend was:

delete the DAG file (in my case delete from pipeline repository and deploy to airflow servers, esp the scheduler)
DO NOT refresh web GUI.
In the web GUI in the DAGs view (normal frontpage) click on "Delete dag" -> the red icon on the far right.
It cleans up all the remains of this DAG from the database.

回答6:

I've written a script that deletes all metadata related to a specific dag for the default SQLite DB. This is based on Jesus's answer above but adapted from Postgres to SQLite. Users should set ../airflow.db to wherever script.py is stored relative to the default airflow.db file (usually ~/airflow). To execute, use python script.py dag_id.

import sqlite3
import sys

conn = sqlite3.connect('../airflow.db')
c = conn.cursor()

dag_input = sys.argv[1]

for t in ["xcom", "task_instance", "sla_miss", "log", "job", "dag_run", "dag" ]:
    query = "delete from {} where dag_id='{}'".format(t, dag_input)
    c.execute(query)

conn.commit()
conn.close()

回答7:

Airflow 1.10.1 has been released. This release adds the ability to delete a DAG from the web UI after you have deleted the corresponding DAG from the file system.

See this ticket for more details:

[AIRFLOW-2657] Add ability to delete DAG from web ui

Please note that this doesn't actually delete the DAG from the file system, you will need to do this manually first otherwise the DAG will get reloaded.

回答8:

There is nothing inbuilt in Airflow that does that for you. In order to delete the DAG, delete it from the repository and delete the database entries in the Airflow metastore table - dag.

回答9:

You can clear a set of task instance, as if they never ran with:

airflow clear dag_id -s 2017-1-23 -e 2017-8-31

And then remove dag file from dags folder

回答10:

Based on the answer of @OlegYamin, I'm doing the following to delete a dag backed by postgres, where airflow uses the public schema.

delete from public.dag_pickle where id = (
    select pickle_id from public.dag where dag_id = 'my_dag_id'
);
delete from public.dag_run where dag_id = 'my_dag_id';
delete from public.dag_stats where dag_id = 'my_dag_id';
delete from public.log where dag_id = 'my_dag_id';
delete from public.sla_miss where dag_id = 'my_dag_id';
delete from public.task_fail where dag_id = 'my_dag_id';
delete from public.task_instance where dag_id = 'my_dag_id';
delete from public.xcom where dag_id = 'my_dag_id';
delete from public.dag where dag_id = 'my_dag_id';

WARNING: The effect/correctness of the first delete query is unknown to me. It is just an assumption that it is needed.

回答11:

just delete it from mysql, works fine for me. delete them from below tables:

dag
dag_constructor
dag_group_ship
dag_pickle
dag_run
dag_stats

(might be more tables in future release) then restart webserver and worker.

回答12:

versions >= 1.10.0:

I have airflow version 1.10.2 and I tried executing airflow delete_dag command but the command throws following error:

bash-4.2# airflow delete_dag dag_id

[2019-03-16 15:37:20,804] {settings.py:174} INFO - settings.configure_orm(): Using pool settings. pool_size=5, pool_recycle=1800, pid=28224 /usr/lib64/python2.7/site-packages/psycopg2/init.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: http://initd.org/psycopg/docs/install.html#binary-install-from-pypi. """) This will drop all existing records related to the specified DAG. Proceed? (y/n)y Traceback (most recent call last): File "/usr/bin/airflow", line 32, in args.func(args) File "/usr/lib/python2.7/site-packages/airflow/utils/cli.py", line 74, in wrapper return f(*args, **kwargs) File "/usr/lib/python2.7/site-packages/airflow/bin/cli.py", line 258, in delete_dag raise AirflowException(err) airflow.exceptions.AirflowException: Server error

Though I am able to delete through Curl command. Please let me know if anyone have idea about this command's execution, is this known or I am doing something wrong.

versions <= 1.9.0:

There is not a command to delete a dag, so you need to first delete the dag file, and then delete all the references to the dag_id from the airflow metadata database.

WARNING

You can reset the airflow meta database, you will erase everything, including the dags, but remember that you will also erase the history, pools, variables, etc.

airflow resetdb and then airflow initdb

回答13:

First --> Delete the DAG file from $AIRFLOW_HOME/dags folder. Note: Depending on whether you have used subdirectories, you may have to dig through the subdirectories to find the DAG file and delete it.

Second --> Delete the DAG from the Webserver UI using the delete button (x in circle)

回答14:

Remove the dag(you want to delete) from the dags folder and run airflow resetdb.

Alternatively, you can go into the airflow_db and manually delete those entries from the dag tables(task_fail, xcom, task_instance, sla_miss, log, job, dag_run, dag, dag_stats).

回答15:

For those who are still finding answers. On Airflow version 1.8, its very difficult to delete a DAG, you can refer to answers above. But since 1.9 has been released, you just have to

remove the dag on the dags folder and restart webserver

来源：https://stackoverflow.com/questions/40651783/airflow-how-to-delete-a-dag

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airflow