ft2898 commented on issue #52276:
URL: https://github.com/apache/airflow/issues/52276#issuecomment-3035389846
@sjyangkevin
I have a DAG named example_bash_operator1. Initially, I added a task with
task_id as runme_3501. While the runme_3501 task was running, I added another
task with task_id as runme_3502. However, I observed that when the runme_3501
task finished, it marked runme_3502 as removed. I tracked this behavior to the
following piece of code:
```
def _filter_tis_and_exclude_removed(dag: DAG, tis: list[TI]) -> Iterable[TI]:
"""Populate ``ti.task`` while excluding those missing one, marking them
as REMOVED."""
for ti in tis:
try:
ti.task = dag.get_task(ti.task_id)
except TaskNotFound:
if ti.state != TaskInstanceState.REMOVED:
self.log.error("Failed to get task for ti %s. Marking it as
removed.", ti)
ti.state = TaskInstanceState.REMOVED
session.flush()
else:
yield ti
```
It seems that tasks are being cached during the execution of runme_3501.
When the task completes, Airflow verifies the current state of all tasks in the
DAG file. If it finds any task_id that do not match the cached data, an
exception is raised, and the associated task is marked as removed. This change
in the database state for runme_3502 consequently causes it to be rescheduled.
Below are the logs from runme_3501. Please pay special attention to the
critical log line:
> [2025-07-04, 17:55:34 CST] {dagrun.py:977} ERROR - Failed to get task for
ti . Marking it as removed.
Full Logs:
> [2025-07-04, 17:44:47 CST] {local_task_job_runner.py:123} ▼ Pre task
execution logs
> [2025-07-04, 17:44:47 CST] {taskinstance.py:2614} INFO - Dependencies all
met for dep_context=non-requeueable deps ti=
> [2025-07-04, 17:44:48 CST] {taskinstance.py:2614} INFO - Dependencies all
met for dep_context=requeueable deps ti=
> [2025-07-04, 17:44:48 CST] {taskinstance.py:2867} INFO - Starting attempt
1 of 1
> [2025-07-04, 17:44:48 CST] {taskinstance.py:2890} INFO - Executing on
2025-07-02 16:00:00+00:00
> [2025-07-04, 17:44:48 CST] {standard_task_runner.py:72} INFO - Started
process 91058 to run task
> [2025-07-04, 17:44:48 CST] {standard_task_runner.py:104} INFO - Running:
['airflow', 'tasks', 'run', 'example_bash_operator1', 'runme_3501',
'scheduled__2025-07-02T16:00:00+00:00', '--job-id', '1465677', '--raw',
'--subdir', 'DAGS_FOLDER/example_bash_operator1.py', '--cfg-path',
'/tmp/tmp_7nmg8fj']
> [2025-07-04, 17:44:48 CST] {standard_task_runner.py:105} INFO - Job
1465677: Subtask runme_3501
> [2025-07-04, 17:44:48 CST] {task_command.py:467} INFO - Running on host
centos-hadoop3dn-480896.intsig.internal
> [2025-07-04, 17:45:07 CST] {taskinstance.py:3134} INFO - Exporting env
vars: AIRFLOW_CTX_DAG_OWNER='airflow'
AIRFLOW_CTX_DAG_ID='example_bash_operator1' AIRFLOW_CTX_TASK_ID='runme_3501'
AIRFLOW_CTX_EXECUTION_DATE='2025-07-02T16:00:00+00:00'
AIRFLOW_CTX_TRY_NUMBER='1'
AIRFLOW_CTX_DAG_RUN_ID='scheduled__2025-07-02T16:00:00+00:00'
> [2025-07-04, 17:45:07 CST] {taskinstance.py:732} ▲▲▲ Log group end
> [2025-07-04, 17:45:07 CST] {subprocess.py:78} INFO - Tmp dir root
location: /tmp
> [2025-07-04, 17:45:07 CST] {subprocess.py:88} INFO - Running command:
['/usr/bin/bash', '-c', 'echo "example_bash_operator1__runme_3501__20250702" &&
sleep 600']
> [2025-07-04, 17:45:07 CST] {subprocess.py:99} INFO - Output:
> [2025-07-04, 17:45:07 CST] {subprocess.py:116} INFO -
example_bash_operator1__runme_3501__20250702
> [2025-07-04, 17:55:07 CST] {subprocess.py:136} INFO - Command exited with
return code 0
> [2025-07-04, 17:55:07 CST] {taskinstance.py:341} ▼ Post task execution logs
> [2025-07-04, 17:55:07 CST] {taskinstance.py:353} INFO - Marking task as
SUCCESS. dag_id=example_bash_operator1, task_id=runme_3501,
run_id=scheduled__2025-07-02T16:00:00+00:00, execution_date=20250702T160000,
start_date=20250704T094447, end_date=20250704T095507
> [2025-07-04, 17:55:34 CST] {local_task_job_runner.py:266} INFO - Task
exited with return code 0
> [2025-07-04, 17:55:34 CST] {dagrun.py:977} ERROR - Failed to get task for
ti . Marking it as removed.
> [2025-07-04, 17:55:38 CST] {standard_task_runner.py:217} INFO - Process
not found (most likely exited), stop collecting metrics
> [2025-07-04, 17:55:38 CST] {taskinstance.py:3901} INFO - 0 downstream
tasks scheduled from follow-on schedule check
> [2025-07-04, 17:55:38 CST] {local_task_job_runner.py:245} ▲▲▲ Log group
end
Looking forward to further clarification or suggestions for resolving this
issue!
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