lgwacker opened a new issue #13799:
URL: https://github.com/apache/airflow/issues/13799
**Apache Airflow version**:
2.0.0
**Kubernetes version (if you are using kubernetes)** (use `kubectl version`):
1.15
**Environment**:
- **Cloud provider or hardware configuration**:
GKE
- **OS** (e.g. from /etc/os-release):
Ubuntu 18.04
**What happened**:
I just migrated from 1.10.14 to 2.0.0. When I turn on some random dags, the
scheduler crashes with the following error:
```python
Traceback (most recent call last):
File
"/usr/local/lib/python3.6/dist-packages/airflow/jobs/scheduler_job.py", line
1275, in _execute
self._run_scheduler_loop()
File
"/usr/local/lib/python3.6/dist-packages/airflow/jobs/scheduler_job.py", line
1377, in _run_scheduler_loop
num_queued_tis = self._do_scheduling(session)
File
"/usr/local/lib/python3.6/dist-packages/airflow/jobs/scheduler_job.py", line
1533, in _do_scheduling
num_queued_tis =
self._critical_section_execute_task_instances(session=session)
File
"/usr/local/lib/python3.6/dist-packages/airflow/jobs/scheduler_job.py", line
1132, in _critical_section_execute_task_instances
queued_tis = self._executable_task_instances_to_queued(max_tis,
session=session)
File "/usr/local/lib/python3.6/dist-packages/airflow/utils/session.py",
line 62, in wrapper
return func(*args, **kwargs)
File
"/usr/local/lib/python3.6/dist-packages/airflow/jobs/scheduler_job.py", line
1034, in _executable_task_instances_to_queued
if task_instance.pool_slots > open_slots:
TypeError: '>' not supported between instances of 'NoneType' and 'int'
```
**What you expected to happen**:
I expected those dags would have their tasks scheduled without problems.
**How to reproduce it**:
Can't reproduce it yet. Still trying to figure out if this happens only with
specific dags or not.
**Anything else we need to know**:
I couldn't find in which context `task_instance.pool_slots` could be None
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