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open-nomad/.changelog/12078.txt

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CSI: allow for concurrent plugin allocations (#12078) The dynamic plugin registry assumes that plugins are singletons, which matches the behavior of other Nomad plugins. But because dynamic plugins like CSI are implemented by allocations, we need to handle the possibility of multiple allocations for a given plugin type + ID, as well as behaviors around interleaved allocation starts and stops. Update the data structure for the dynamic registry so that more recent allocations take over as the instance manager singleton, but we still preserve the previous running allocations so that restores work without racing. Multiple allocations can run on a client for the same plugin, even if only during updates. Provide each plugin task a unique path for the control socket so that the tasks don't interfere with each other.
2022-02-23 20:23:07 +00:00
```release-note:improvement
csi: Allow for concurrent plugin allocations
```
```release-note:breaking-change
client: The client state store will be automatically migrated to a new schema version when upgrading a client. Downgrading to a previous version of the client after upgrading it to Nomad 1.3 is not supported. To downgrade safely, users should erase the Nomad client's data directory.
```
```release-note:breaking-change
csi: The client filesystem layout for CSI plugins has been updated to correctly handle the lifecycle of multiple allocations serving the same plugin. Running plugin tasks will not be updated after upgrading the client, but it is recommended to redeploy CSI plugin jobs after upgrading the cluster.
```