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You can see that if CloudStack ever needs to define a new transitional VM state, it will be very hard for hypervisor resource-agent developer to follow, most of sync originated problems happen when developer fails to correctly manage the state cache maintained at resource side.

Since now resource-agent is only required to report raw VM power state, above code logic can become as simple as following

    protected HashMap<String, PowerState> sync() {
    	return getVmStates();
    }

2) Serialize VM operations

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