raman created AIRFLOW-2736:
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Summary: Airflow 1.9.0+ Scheduler not honouring
"non_pooled_task_slot_count" config
Key: AIRFLOW-2736
URL: https://issues.apache.org/jira/browse/AIRFLOW-2736
Project: Apache Airflow
Issue Type: Bug
Components: scheduler
Affects Versions: 1.9.0
Reporter: raman
We are using airflow version 1.9 with celery executor. And we are observing
that Airflow Scheduler is not honouring the "non_pooled_task_slot_count"
config. We are using default setting which is set to 128. But we could
schedule and run >128 tasks concurrently.
>From code it seems that scheduler is re-initialising the open_slots with 128
>instead of setting the remaining left over slots.
in Jobs.py
for pool, task_instances in pool_to_task_instances.items():
if not pool:
# Arbitrary:
# If queued outside of a pool, trigger no more than
# non_pooled_task_slot_count per run
open_slots = conf.getint('core', 'non_pooled_task_slot_count')
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