Description:
For MySQL Routers that belong to a MySQL Server cluster-set setup (using InnoDB), the MySQL Shell 8.2+ `cluster.setRoutingOption()` function introduced to tweak the `unreachable_quorum_allowed_traffic` Router setting, crash with "Router is not part of this topology" error.
The crash was noticed in a setup with:
- Three MySQL Server 8.4.8 instances cluster, belonging to a cluster-set.
- One MySQL Router 8.4.8 instance.
- One MySQL Shell 8.4.8 session.
However, we are relatively confident that this problem will be visible in all MySQL Router / Shell versions between 8.2.X and 8.4.X, probably even in 9.7.X.
---
In a MySQL Shell session:
```python
> cluster = dba.get_cluster()
> cluster.list_routers()
RuntimeError: Cluster.list_routers: Function not available for ClusterSet members
> cluster.set_routing_option('mysql-router-k8s-0.mysql-router-k8s-endpoints.testing.svc.cluster.local::system', 'unreachable_quorum_allowed_traffic', 'ALL')
ValueError: Cluster.set_routing_option: Router 'mysql-router-k8s-0.mysql-router-k8s-endpoints.testing.svc.cluster.local::system' is not part of this topology
```
```python
> cs = dba.get_cluster_set()
> cs.list_routers()
{
"domainName": "cluster-set-56a15125e1b063355823e0c5845d4f80",
"routers": {
"mysql-router-k8s-0.mysql-router-k8s-endpoints.testing.svc.cluster.local::system": {
...
}
}
}
> cs.set_routing_option('mysql-router-k8s-0.mysql-router-k8s-endpoints.testing.svc.cluster.local::system', 'unreachable_quorum_allowed_traffic', 'ALL')
ValueError: ClusterSet.set_routing_option: Unsupported routing option, 'unreachable_quorum_allowed_traffic' supported options: ...
```
How to repeat:
1. Deploy three MySQL Server 8.4.8 instance cluster.
2. Bootstrap a MySQL Server cluster-set.
3. Deploy one MySQL Router 8.4.8 instance.
4. Bootstrap the Router into the cluster-set.
5. Start a MySQL Shell 8.4.8 python shell
6. Issue the following commands:
```python
cluster = dba.get_cluster()
cluster.set_routing_option('<router-name>::system', 'unreachable_quorum_allowed_traffic', 'ALL')
```
Suggested fix:
According to Miguel Araújo, MySQL Shell should be able to tweak all Router settings at the cluster-set level as well. Therefore, the list of possible options that can be tweaked in the `ClusterSet.setRoutingOption()` needs to be expanded to account for the MySQL Router 8.2+ ones, namely `unreachable_quorum_allowed_traffic`.
© 2026, Oracle Corporation and/or its affiliates
Description: For MySQL Routers that belong to a MySQL Server cluster-set setup (using InnoDB), the MySQL Shell 8.2+ `cluster.setRoutingOption()` function introduced to tweak the `unreachable_quorum_allowed_traffic` Router setting, crash with "Router is not part of this topology" error. The crash was noticed in a setup with: - Three MySQL Server 8.4.8 instances cluster, belonging to a cluster-set. - One MySQL Router 8.4.8 instance. - One MySQL Shell 8.4.8 session. However, we are relatively confident that this problem will be visible in all MySQL Router / Shell versions between 8.2.X and 8.4.X, probably even in 9.7.X. --- In a MySQL Shell session: ```python > cluster = dba.get_cluster() > cluster.list_routers() RuntimeError: Cluster.list_routers: Function not available for ClusterSet members > cluster.set_routing_option('mysql-router-k8s-0.mysql-router-k8s-endpoints.testing.svc.cluster.local::system', 'unreachable_quorum_allowed_traffic', 'ALL') ValueError: Cluster.set_routing_option: Router 'mysql-router-k8s-0.mysql-router-k8s-endpoints.testing.svc.cluster.local::system' is not part of this topology ``` ```python > cs = dba.get_cluster_set() > cs.list_routers() { "domainName": "cluster-set-56a15125e1b063355823e0c5845d4f80", "routers": { "mysql-router-k8s-0.mysql-router-k8s-endpoints.testing.svc.cluster.local::system": { ... } } } > cs.set_routing_option('mysql-router-k8s-0.mysql-router-k8s-endpoints.testing.svc.cluster.local::system', 'unreachable_quorum_allowed_traffic', 'ALL') ValueError: ClusterSet.set_routing_option: Unsupported routing option, 'unreachable_quorum_allowed_traffic' supported options: ... ``` How to repeat: 1. Deploy three MySQL Server 8.4.8 instance cluster. 2. Bootstrap a MySQL Server cluster-set. 3. Deploy one MySQL Router 8.4.8 instance. 4. Bootstrap the Router into the cluster-set. 5. Start a MySQL Shell 8.4.8 python shell 6. Issue the following commands: ```python cluster = dba.get_cluster() cluster.set_routing_option('<router-name>::system', 'unreachable_quorum_allowed_traffic', 'ALL') ``` Suggested fix: According to Miguel Araújo, MySQL Shell should be able to tweak all Router settings at the cluster-set level as well. Therefore, the list of possible options that can be tweaked in the `ClusterSet.setRoutingOption()` needs to be expanded to account for the MySQL Router 8.2+ ones, namely `unreachable_quorum_allowed_traffic`.