[GitHub] [airflow] zachliu edited a comment on issue #8541: "TypeError: can't pickle _thread.RLock objects" on usage of BigQueryOperator

[GitBox <gi...@apache.org>]

zachliu edited a comment on issue #8541:
URL: https://github.com/apache/airflow/issues/8541#issuecomment-919232720


   in my case, on `composer 1.13.0 airflow 1.10.12`, this error occurs when i use a for-loop:
   ```python
   downstream_task_1 = SomeOperator()
   downstream_task_2 = SomeOperator()
   for i in range(x):
       task = SomeOperator(
           task_id=f"task_{i}"
       )
       task >> downstream_task_1 >> downstream_task_2
   ```
   strangely, i had to
   ```python
   downstream_task_1 = SomeOperator()
   downstream_task_2 = SomeOperator()
   for i in range(x):
       task = SomeOperator(
           task_id=f"task_{i}"
       )
       task >> downstream_task_1
   downstream_task_1 >> downstream_task_2
   ```
   otherwise `downstream_task_2` will give me the nuke.
   to be more specific:
   * any upstream tasks of `downstream_task_2` can't be cleared with `Downstream` option checked
   * any downstream tasks (including `downstream_task_2` itself) can't be cleared with or without `Downstream` option checked


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