ashb opened a new pull request #11372:
URL: https://github.com/apache/airflow/pull/11372
This is similar to #11327, but for Celery this time.
The impact is not quite as pronounced here (for simple dags at least)
but takes the average queued to start delay from 1.5s to 0.4s
Closes #6905 - the config option added for LocalExecutor is used here too.
Data on this for a simple 10-task sequential DAG:
```sql
SELECT execution_date,
min(start_date - queued_dttm) AS min_quued_delay,
max(start_date - queued_dttm) AS max_queued_delay,
avg(start_date - queued_dttm) AS avg
FROM task_instance
WHERE dag_id = 'scenario1_case2_03_1' GROUP BY execution_date;
```
| execution_date | min_quued_delay | max_queued_delay | avg
| with change? |
| ------------------------------- | ----------------- | ------------------ |
-- | -- |
2020-10-08 01:00:00+01 | 00:00:00.348837 | 00:00:00.473693 |
00:00:00.396751 | Yes |
2020-10-08 02:00:00+01 | 00:00:01.432304 | 00:00:01.574801 |
00:00:01.478422 | No |
This was discovered in my general benchmarking and profiling of the
scheduler for AIP-15, but it's not tied to any of that work. There are more of
these kind of improvements coming, each unrelated but all add up.
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