milton0825 commented on issue #7935:
URL: https://github.com/apache/airflow/issues/7935#issuecomment-774340918
Seeing this on 1.10.8 with Celery executor
```
Thread 1 (idle): "MainThread"
wait (threading.py:295)
wait (threading.py:551)
wait (multiprocessing/pool.py:635)
get (multiprocessing/pool.py:638)
map (multiprocessing/pool.py:266)
trigger_tasks (lyft_etl/airflow/executors/lyft_celery_executor.py:90)
heartbeat (airflow/executors/base_executor.py:130)
_validate_and_run_task_instances (airflow/jobs/scheduler_job.py:1536)
_execute_helper (airflow/jobs/scheduler_job.py:1473)
_execute (airflow/jobs/scheduler_job.py:1412)
run (airflow/jobs/base_job.py:221)
scheduler (airflow/bin/cli.py:1117)
wrapper (airflow/utils/cli.py:75)
<module> (airflow/bin/airflow:37)
<module> (airflow:7)
Thread 97067 (idle): "Thread-5667"
_handle_workers (multiprocessing/pool.py:406)
run (threading.py:864)
_bootstrap_inner (threading.py:916)
_bootstrap (threading.py:884)
Thread 97068 (idle): "Thread-5668"
wait (threading.py:295)
```
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