ashb commented on issue #5908: Revert "[AIRFLOW-4797] Improve performance and behaviour of zombie de… URL: https://github.com/apache/airflow/pull/5908#issuecomment-528316964 @KevinYang21 The original PR says > The query is faster than the previous one (see also stats below). > Tested on our staging environment (patch applied to Airflow 1.10.3), zombie detection works fine, database load is unchanged. Here some stats from pg_stat_statements, the branch run there for 4 hours: The new query (1st line) is faster but is likely called more frequently. The 2nd line shows stats of the old query. > ``` > select calls,mean_time,max_time,rows from pg_stat_statements where query like '%task_instance JOIN job%' and query like '%latest_heartbeat%'; > calls | mean_time | max_time | rows > ----------+--------------------+-------------+------ > 55416 | 0.0260821553522449 | 5.509762 | 29 > 71969011 | 0.575755060854888 | 1078.895322 | 2377 > ``` Do you get different performance behaviour?
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