Hi, I ran the cluster more than 5-6 times with it failing to start since this past morning (about 11-12 hours now) since i'm facing this problem.

Attaching screenshot below and also typing in case someone comes from the web to this thread in future.

Problem : -

It says "failed to start cluster" initially, then i click OK and refresh then i get this below:-

Waiting for cluster to start: Unexpected failure during launch. databricks_error_message: com.databricks.backend.manager.instance.InstanceHolder$PlacementLockTimeout: Could not acquire placement lock context = terminateInstance...

Hope somebody comes and fixes this issue or clears me about it, thank you have a nice day all.