Jeff Hair created CLOUDSTACK-6467:
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Summary: User VM state listener publishes to event bus incompletely
Key: CLOUDSTACK-6467
URL: https://issues.apache.org/jira/browse/CLOUDSTACK-6467
Project: CloudStack
Issue Type: Bug
Security Level: Public (Anyone can view this level - this is the default.)
Components: Management Server
Affects Versions: 4.2.0, 4.3.0, 4.4.0, 4.5.0
Environment: CentOS 6.5
Reporter: Jeff Hair
The UserVMStateListener is responsible for publishing resource state transition
events and usage events for virtual machines. It has an issue where, from the
point of view of any listener bound on the event bus, it publishes resource
state transition events for user VMs twice and only publishes events for system
VMs (e.g. virtual routers) once, but before the state transition happens. Usage
events are unaffected.
This is because of two issues:
1. The publishOnEventBusMethod receives a status parameter to determine whether
the event is pre- or post-transition. It ignores this parameter when publishing.
2. Only pre-transition events are published for system VMs like routers. This
means there is no reliable way to act on a state transition event for system
VMs if we are interested in doing something AFTER they have changed the state.
The easiest solution to these issues is to move the the publishOnEventBus call
in postStateTransitionEvent to before it returns for non-user VMs, and then
also add the status string into the event description map when publishing to
the event bus.
I've also submitted a patch for this change to review board.
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