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Remove internal retry loop #216

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merged 2 commits into from
Feb 8, 2019
Merged

Remove internal retry loop #216

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56b5d37
Remove internal retry loop
jsafrane Feb 7, 2019
c489bac
Add parameters for provisioning/deletion backoff.
jsafrane Feb 7, 2019
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Remove internal retry loop 
We should use exponential backoff from the provisioner library. It will
react more quickly when a PVC is deleted and it won't occupy a worker
thread.
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@jsafrane
jsafrane committed Feb 7, 2019
commit 56b5d37c27993805890bcf927eac667072a80c6a
26 changes: 3 additions & 23 deletions pkg/controller/controller.go
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Original file line number Diff line number Diff line change
Expand Up @@ -40,14 +40,11 @@ import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/validation"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"

"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/status"

"github.com/container-storage-interface/spec/lib/go/csi"
csiclientset "k8s.io/csi-api/pkg/client/clientset/versioned"
Expand Down Expand Up @@ -566,26 +563,9 @@ func (p *csiProvisioner) Provision(options controller.VolumeOptions) (*v1.Persis
return nil, fmt.Errorf("failed to strip CSI Parameters of prefixed keys: %v", err)
}

opts := wait.Backoff{Duration: backoffDuration, Factor: backoffFactor, Steps: backoffSteps}
err = wait.ExponentialBackoff(opts, func() (bool, error) {
ctx, cancel := context.WithTimeout(context.Background(), p.timeout)
defer cancel()
rep, err = p.csiClient.CreateVolume(ctx, &req)
if err == nil {
// CreateVolume has finished successfully
return true, nil
}

if status, ok := status.FromError(err); ok {
if status.Code() == codes.DeadlineExceeded {
// CreateVolume timed out, give it another chance to complete
klog.Warningf("CreateVolume timeout: %s has expired, operation will be retried", p.timeout.String())
return false, nil
}
}
// CreateVolume failed , no reason to retry, bailing from ExponentialBackoff
return false, err
})
ctx, cancel := context.WithTimeout(context.Background(), p.timeout)
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this is still the rpc connection timeout value right? Do we want to have a separate timeout value for the CreateVolume call? For some drivers, the provisioning operation could take minutes.

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No, the value is not right. I'd like to address it in a separate PR.

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Filled #227

defer cancel()
rep, err = p.csiClient.CreateVolume(ctx, &req)

if err != nil {
return nil, err
Expand Down