mount with shared not working

[mqyang56]

What is your environment(Kubernetes version, Fluid version, etc.) kubernetes: v1.18.13 fluid: 0.6.0 Describe the bug mount with shared not working

What you expect to happen: mount with shared succeed.

How to reproduce it As shown below

Additional Information

apiVersion: data.fluid.io/v1alpha1
kind: Dataset
...
spec:
  mounts:
  - mountPoint: pvc://datasets
    name: datasets
    shared: true
...

alluxio fs mount (exec command in worker container)

/underFSStorage  on  /  (local, capacity=499.76GB, used=260.49GB(52%), not read-only, not shared, properties={})

AlluxioRuntimeController partial logs:

alluxio/dataset.go:59	the dataset status	{"alluxioruntime": "gddi-vicuna/fluid-coding-datasets-cache", "status": {"mounts":[{"mountPoint":"pvc://datasets","name":"datasets","shared":true}],