[1.2] Cherry pick: Retry provisioning of volumes after transient error #319
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The provisioner should retry CreateVolume call after a transient error (such as timeout), because the CSI driver may be creating a volume in the background. Therefore ProvisionerExt interface need to be implemented. ProvisionExt() returns: - Finished, if it can be 100% sure that the driver is not creating a volume - NoChange, if something (temporarily?) failed before reaching the CSI driver, for example when Kubernetes API server is not reachable. - InBackground, if error returned by the driver (or gRPC) is transient.
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This is cherry-pick of #312 into 1.2
The provisioner should retry CreateVolume call after a transient error
(such as timeout), because the CSI driver may be creating a volume in the
background.
Therefore ProvisionerExt interface need to be implemented. ProvisionExt()
returns:
driver, for example when Kubernetes API server is not reachable.