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Posted to commits@airflow.apache.org by GitBox <gi...@apache.org> on 2021/04/07 17:11:18 UTC
[GitHub] [airflow] uranusjr commented on issue #8687: Airflow webserver should handle signals immediately when starting
uranusjr commented on issue #8687:
URL: https://github.com/apache/airflow/issues/8687#issuecomment-815080410
I can’t seem to replicate this, The Gunicorn subprocess can’t be kiled immediately (this seems like a Gunicorn issue and not Airflow), but after the Gunicorn subprocess emits the *Can't connect to* log, Ctrl-C correctly makes it exit (and thus ending the parent Airflow process.
```
$ airflow webserver
...
=================================================================
[2021-04-07 17:03:48 +0000] [2031] [INFO] Starting gunicorn 19.9.0
[2021-04-07 17:03:48 +0000] [2031] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:03:48 +0000] [2031] [ERROR] Retrying in 1 second.
[2021-04-07 17:03:49 +0000] [2031] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:03:49 +0000] [2031] [ERROR] Retrying in 1 second.
[2021-04-07 17:03:50 +0000] [2031] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:03:50 +0000] [2031] [ERROR] Retrying in 1 second.
[2021-04-07 17:03:51 +0000] [2031] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:03:51 +0000] [2031] [ERROR] Retrying in 1 second.
[2021-04-07 17:03:52 +0000] [2031] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:03:52 +0000] [2031] [ERROR] Retrying in 1 second.
[2021-04-07 17:03:53 +0000] [2031] [ERROR] Can't connect to ('0.0.0.0', 8080)
^C[2021-04-07 17:03:57,021] {webserver_command.py:431} INFO - Received signal: 2. Closing gunicorn.
$ echo $?
0
```
Pressing Ctrl-C while Gunicorn is still connecting also correctly sends a SIGINT (2) to Gunicorn, and makes it exit after the connection failures:
```
$ airflow webserver
...
=================================================================
[2021-04-07 17:01:53 +0000] [1923] [INFO] Starting gunicorn 19.9.0
[2021-04-07 17:01:53 +0000] [1923] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:01:53 +0000] [1923] [ERROR] Retrying in 1 second.
[2021-04-07 17:01:54 +0000] [1923] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:01:54 +0000] [1923] [ERROR] Retrying in 1 second.
^C[2021-04-07 17:01:55,025] {webserver_command.py:431} INFO - Received signal: 2. Closing gunicorn.
[2021-04-07 17:01:55 +0000] [1923] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:01:55 +0000] [1923] [ERROR] Retrying in 1 second.
[2021-04-07 17:01:56 +0000] [1923] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:01:56 +0000] [1923] [ERROR] Retrying in 1 second.
[2021-04-07 17:01:57 +0000] [1923] [ERROR] Connection in use: ('0.0.0.0', 8080)
[2021-04-07 17:01:57 +0000] [1923] [ERROR] Retrying in 1 second.
[2021-04-07 17:01:58 +0000] [1923] [ERROR] Can't connect to ('0.0.0.0', 8080)
$ echo $?
0
```
The same behaviour is observed between Gunicorn 19.9.0 (which the OP uses) and 19.10.0 (the version suggested by the official constraints file), against Airflow master (but I could not find any relevant differences in 1.10.10).
I wonder if the Python version is relevant here?
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