ashb commented on pull request #20975:
URL: https://github.com/apache/airflow/pull/20975#issuecomment-1030162294
It failed after 37 mins with:
```
psycopg2.errors.UniqueViolation: could not create unique index "xcom_pkey"
DETAIL: Key (dagrun_id, task_id, key)=(6661, task_6, return_value) is
duplicated.
```
Looking up that dagrun and xcom rows:
```
airflow-22=# select id,dag_id,execution_date,run_id from dag_run where id =
6661;
id | dag_id | execution_date | run_id
------+--------+------------------------+----------------------------
6661 | dag_3 | 2008-03-11 09:00:00+00 | run_2008-03-11T09:00:00+00
(1 row)
airflow-22=# select * from xcom where dag_id='dag_3' and execution_date =
'2008-03-11 09:00:00+00';
key | value | timestamp | execution_date
| task_id | dag_id
--------------+-------+-------------------------------+------------------------+---------+--------
return_value | \x | 2022-02-04 15:27:34.262708+00 | 2008-03-11
09:00:00+00 | task_1 | dag_3
return_value | \x | 2022-02-04 15:27:34.262708+00 | 2008-03-11
09:00:00+00 | task_2 | dag_3
return_value | \x | 2022-02-04 15:27:34.262708+00 | 2008-03-11
09:00:00+00 | task_3 | dag_3
return_value | \x | 2022-02-04 15:27:34.262708+00 | 2008-03-11
09:00:00+00 | task_4 | dag_3
return_value | \x | 2022-02-04 15:27:34.262708+00 | 2008-03-11
09:00:00+00 | task_5 | dag_3
return_value | \x | 2022-02-04 15:27:34.262708+00 | 2008-03-11
09:00:00+00 | task_6 | dag_3
```
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