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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (AIRFLOW-1945) Pass --autoscale to celery workers
Date Mon, 15 Oct 2018 17:04:00 GMT


ASF GitHub Bot commented on AIRFLOW-1945:

msumit closed pull request #3989: [AIRFLOW-1945] Autoscale celery workers for airflow added

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diff --git a/airflow/bin/ b/airflow/bin/
index 675a88a63c..cfc6c6b8d6 100644
--- a/airflow/bin/
+++ b/airflow/bin/
@@ -1038,12 +1038,16 @@ def worker(args):
     from airflow.executors.celery_executor import app as celery_app
     from celery.bin import worker
+    autoscale = args.autoscale
+    if autoscale is None and conf.has_option("celery", "worker_autoscale"):
+        autoscale = conf.get("celery", "worker_autoscale")
     worker = worker.worker(app=celery_app)
     options = {
         'optimization': 'fair',
         'O': 'fair',
         'queues': args.queues,
         'concurrency': args.concurrency,
+        'autoscale': autoscale,
         'hostname': args.celery_hostname,
         'loglevel': conf.get('core', 'LOGGING_LEVEL'),
@@ -1916,6 +1920,9 @@ class CLIFactory(object):
             ('-d', '--delete'),
             help='Delete a user',
+        'autoscale': Arg(
+            ('-a', '--autoscale'),
+            help="Minimum and Maximum number of worker to autoscale"),
     subparsers = (
@@ -2058,7 +2065,7 @@ class CLIFactory(object):
             'func': worker,
             'help': "Start a Celery worker node",
             'args': ('do_pickle', 'queues', 'concurrency', 'celery_hostname',
-                     'pid', 'daemon', 'stdout', 'stderr', 'log_file'),
+                     'pid', 'daemon', 'stdout', 'stderr', 'log_file', 'autoscale'),
         }, {
             'func': flower,
             'help': "Start a Celery Flower",
diff --git a/airflow/config_templates/default_airflow.cfg b/airflow/config_templates/default_airflow.cfg
index b572dbb2f7..12e5a16f21 100644
--- a/airflow/config_templates/default_airflow.cfg
+++ b/airflow/config_templates/default_airflow.cfg
@@ -349,6 +349,13 @@ celery_app_name = airflow.executors.celery_executor
 # your worker box and the nature of your tasks
 worker_concurrency = 16
+# The minimum and maximum concurrency that will be used when starting workers with the
+# "airflow worker" command. Pick these numbers based on resources on
+# worker box and the nature of the task. If autoscale option is available worker_concurrency
+# will be ignored.
+# worker_autoscale = 12,16
 # When you start an airflow worker, airflow starts a tiny web server
 # subprocess to serve the workers local log files to the airflow main
 # web server, who then builds pages and sends them to users. This defines


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> Pass --autoscale to celery workers
> ----------------------------------
>                 Key: AIRFLOW-1945
>                 URL:
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: celery, cli
>            Reporter: Michael O.
>            Assignee: Sai Phanindhra
>            Priority: Trivial
>              Labels: easyfix
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
> Celery supports autoscaling of the worker pool size (number of tasks that can parallelize
within one worker node).  I'd like to propose to support passing the --autoscale parameter
to {{airflow worker}}.
> Since this is a trivial change, I am not sure if there's any reason for not being supported
> For example
> {{airflow worker --concurrency=4}} will set a fixed pool size of 4.
> With minimal changes in []
it could support
> {{airflow worker --autoscale=2,10}} to set an autoscaled pool size of 2 to 10
> Some references:
> *
> *

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