Tungsten Fabric known issues¶
This section lists the Tungsten Fabric known issues with workarounds for the Mirantis OpenStack for Kubernetes release 22.2. For Tungsten Fabric limitations, see Tungsten Fabric known limitations.
 TF pods switch to CrashLoopBackOff after a simultaneous reboot¶
Rebooting all Cassandra cluster TFConfig or TFAnalytics nodes, maintenance, or other circumstances that cause the Cassandra pods to start simultaneously may cause a broken Cassandra TFConfig and/or TFAnalytics cluster. In this case, Cassandra nodes do not join the ring and do not update the IPs of the neighbor nodes. As a result, the TF services cannot operate Cassandra cluster(s).
To verify that a Cassandra cluster is affected:
Run the nodetool status command specifying the
analytics cluster and the replica number:
kubectl -n tf exec -it tf-cassandra-<config/analytics>-dc1-rack1-<replica number> -c cassandra -- nodetool status
Example of system response with outdated IP addresses:
Datacenter: DC1 =============== Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack DN <outdated ip> ? 256 64.9% a58343d0-1e3f-4d54-bcdf-9b9b949ca873 r1 DN <outdated ip> ? 256 69.8% 67f1d07c-8b13-4482-a2f1-77fa34e90d48 r1 Datacenter: dc1 =============== Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack UN <actual ip> 3.84 GiB 256 65.2% 7324ebc4-577a-425f-b3de-96faac95a331 rack1
Manually delete a Cassandra pod from the failed
cluster to re-initiate the bootstrap process for one of the Cassandra nodes:
kubectl -n tf delete pod tf-cassandra-<config/analytics>-dc1-rack1-<replica number>
 tf-control does not refresh IP addresses of Cassandra pods¶
tf-control service resolves the DNS names of Cassandra pods at startup
and does not update them if Cassandra pods got new IP addresses, for example,
in case of a restart. As a workaround, to refresh the IP addresses of
Cassandra pods, restart the
tf-control pods one by one:
kubectl -n tf delete pod tf-control-<hash>
Before restarting the
Verify that the new pods are successfully spawned.
Verify that no vRouters are connected to only one
tf-controlpod that will be restarted.