Repeated mounts cause the server to occupy a lot of handlers

[Haoning-Sun]

Alluxio Version: 2.7.1(The master branch code should be the same logic)

Describe the bug

• The retry is caused by ozone client. The retry time is too long without changing the configuration of ozone. And the handler holds the lock of the alluxio path.

• Mounting the same alluxio path repeatedly will block the lock method.

• Repeated calls to mount may consume a large number of handlers.

• Even the trylock method cannot solve this problem.

To Reproduce

• Use a wrong UFS path of ozone.
• Repeat the same mount operation.

Expected behavior Avoid consuming a large number of handlers.

Urgency When a large number of handlers are occupied, the master node will be affected.

[HelloHorizon]

@maobaolong do you aware of this issue?

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in two weeks if no further activity occurs. Thank you for your contributions.