Test File Sync Cancellation

https://github.com/longhorn/longhorn/issues/2416

Test step

For test convenience, manually launch the backing image manager pods:

apiVersion: apps/v1
kind: DaemonSet
metadata:
  labels:
    app: backing-image-manager
  name: backing-image-manager
  namespace: longhorn-system
spec:
  selector:
    matchLabels:
      app: backing-image-manager
  template:
    metadata:
      labels:
        app: backing-image-manager
    spec:
      containers:
      - name: backing-image-manager
        image: longhornio/backing-image-manager:master
        imagePullPolicy: Always
        securityContext:
          privileged: true
        command:
        - backing-image-manager
        - --debug
        - daemon
        - --listen
        - 0.0.0.0:8000
        readinessProbe:
          tcpSocket:
            port: 8000
        volumeMounts:
        - name: disk-path
          mountPath: /data
      volumes:
      - name: disk-path
        hostPath:
          path: /var/lib/longhorn/
      serviceAccountName: longhorn-service-account

Download a backing image in the first pod:

# alias bm="backing-image-manager backing-image"
# bm pull --name bi-test --uuid uuid-bi-test --download-url https://cloud-images.ubuntu.com/minimal/releases/focal/release-20200729/ubuntu-20.04-minimal-cloudimg-amd64.img
# bm ls

In the 2nd pod, limit the bandwidth first so that the downloading won’t be done within several seconds

tc qdisc del dev eth0 root
tc qdisc add dev eth0 root tbf rate 500kbit latency 0.1ms burst 1000kbit

Then start to get the backing image file from the 1st BIM pod

# alias bm="backing-image-manager backing-image"
# bm sync --name bi-test --uuid uuid-bi-test --download-url https://cloud-images.ubuntu.com/minimal/releases/focal/release-20200729/ubuntu-20.04-minimal-cloudimg-amd64.img --size 208601088 --from-host <the IP of 1st BIM pod> --to-host <the IP of 2nd BIM pod>
# bm ls

During the syncing, directly deleting the downloading backing image in the 2nd pod

# bm delete bi-test

Wait 1 minute and check the log of the 2nd pod. Make sure there is no download/sync (failure) related logs after the deletion. Then restarting sync without deletion, the backing image can be downloaded successfully.

[Edit]

Test File Sync Cancellation

Related issue

Test step