[GitHub] [airflow] jyotsa09 opened a new issue #22144: Deleted task logs appended to new logs for scheduled runs

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

jyotsa09 opened a new issue #22144:
URL: https://github.com/apache/airflow/issues/22144


   ### Apache Airflow version
   
   main (development)
   
   ### What happened
   
   Deleted task logs appended to new logs for scheduled runs
   
   ### What you expected to happen
   
   Only new logs should display
   
   ### How to reproduce
   
   1. Triggered a scheduled run
   2. Once completed delete the dag from UI
   3. Triggered the same dag
   4. Then check logs
   
   ### Operating System
   
   Debian buster
   
   ### Versions of Apache Airflow Providers
   
   _No response_
   
   ### Deployment
   
   Astronomer
   
   ### Deployment details
   
   astro dev start
   
   ### Anything else
   
   ```
   from airflow import DAG
   
   from airflow.operators.python_operator import PythonOperator
   from airflow.operators.dummy_operator import DummyOperator
   from datetime import datetime, timedelta
   from airflow.utils.log.log_reader import TaskLogReader
   from pprint import pprint
   
   default_args = {
       "owner": "airflow",
       "depends_on_past": False,
       "start_date": datetime(2022, 3, 5),
       "email_on_failure": False,
       "email_on_retry": False,
       # "retries": 1,
       "retry_delay": timedelta(minutes=5),
   }
   
   
   def print_fun(message):
       """
       Insert arbitrary python function here
       """
       return message
   
   
   def read_logs(**context):
       dagrun = context["dag_run"]
       task_instance = dagrun.get_task_instance("python_function_hello")
       logs, _ = TaskLogReader().read_log_chunks(task_instance, 1, {"download_logs": True})
       assert "Returned value not shown" not in logs[0][0][1]
       assert "hello" in logs[0][0][1]
       task_instance = dagrun.get_task_instance("python_function_bye")
       logs, _ = TaskLogReader().read_log_chunks(task_instance, 1, {"download_logs": True})
       assert "Returned value not shown" in logs[0][0][1]
   
   
   dag = DAG(
       "example_python_operator_test",
       max_active_runs=3,
       catchup=True,
       schedule_interval="@daily",
       default_args=default_args,
       tags=["testim"],
   )
   
   
   with dag:
       start = DummyOperator(task_id="start")
   
       t1 = PythonOperator(
           task_id="python_function_hello",
           python_callable=print_fun,
           show_return_value_in_logs=True,
           op_args=["hello"],
           dag=dag,
       )
       t2 = PythonOperator(
           task_id="python_function_bye",
           python_callable=print_fun,
           show_return_value_in_logs=False,
           op_args=["bye"],
           dag=dag,
       )
       t3 = PythonOperator(
           task_id="function_read_logs",
           python_callable=read_logs,
           dag=dag,
       )
       start >> t1 >> t2 >> t3
   ```
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
   


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