wongelz opened a new issue #15399:
URL: https://github.com/apache/airflow/issues/15399
**Apache Airflow version**: 2.0.1
**Kubernetes version (if you are using kubernetes)** (use `kubectl
version`): 1.16
**Environment**:
- **Cloud provider or hardware configuration**:
- **OS** (e.g. from /etc/os-release):
- **Kernel** (e.g. `uname -a`):
- **Install tools**:
- **Others**:
**What happened**:
Airflow fails to schedule any tasks after some time. The "Task Instance
Details" tab of some of the failed tasks show the following:
```
('Not scheduling since there are %s open slots in pool %s and require %s
pool slots', -3, 'transformation', 3)
```
Admin > Pools tab shows 0 Running Slots but 9 Queued Slots. Gets stuck in
this state until airflow is restarted.
**What you expected to happen**:
Number of "open slots in pool" should never be negative!
**How to reproduce it**:
- Create/configure a pool with a small size (eg. 6)
- DAG with multiple tasks occupying multiple pool_slots (eg. pool_slots=3)
**Anything else we need to know**:
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