On Thu, Aug 24, 2017 at 12:54:26PM +0000, Naud, AntoineX wrote:
Hello,
I am using domain event notifications from libvirt-event API in my application and it
seems to work fine, except for 'suspend' and 'resume' events where I keep
receiving duplicated notifications.
Similarly, the example provided with libvirt (in examples/object-events/event-test) also
produces twice as much notifications for 'suspend' and 'resume' than for
other events. Here is the sequence of virsh commands and the output of event-test:
Virsh start Fed25
Virsh suspend Fed25
Virsh resume Fed25
Virsh shutdown Fed25
[~/libvirt-3.4.0/examples/object-events] ./event-test qemu:///system
Registering event callbacks
myNodeDeviceEventCallback EVENT: Node device net_vnet0_fe_54_00_a0_ba_61 Created 0
myDomainEventCallback1 EVENT: Domain Fed25(1) Resumed Unpaused
myDomainEventCallback2 EVENT: Domain Fed25(1) Resumed Unpaused
myDomainEventCallback1 EVENT: Domain Fed25(1) Started Booted
myDomainEventCallback2 EVENT: Domain Fed25(1) Started Booted
myDomainEventCallback1 EVENT: Domain Fed25(1) Suspended Paused
myDomainEventCallback2 EVENT: Domain Fed25(1) Suspended Paused
myDomainEventCallback1 EVENT: Domain Fed25(1) Suspended Paused
myDomainEventCallback2 EVENT: Domain Fed25(1) Suspended Paused
myDomainEventCallback1 EVENT: Domain Fed25(1) Resumed Unpaused
myDomainEventCallback2 EVENT: Domain Fed25(1) Resumed Unpaused
myDomainEventCallback1 EVENT: Domain Fed25(1) Resumed Unpaused
myDomainEventCallback2 EVENT: Domain Fed25(1) Resumed Unpaused
myDomainEventCallback1 EVENT: Domain Fed25(1) Shutdown Finished
myDomainEventCallback2 EVENT: Domain Fed25(1) Shutdown Finished
myNodeDeviceEventCallback EVENT: Node device net_vnet0_fe_54_00_a0_ba_61 Deleted 0
Note that the 2 lines printed for each event are ok since 2 callbacks are registered in
the example.
We cannot guarantee that some events will not fire multiple times as is
some cases there is no way to check whether it is duplicate or not when
libvirt gets the information. I have a hunch that the fact that events
can happen multiple times is written somewhere in the docs.
Is there any problem you are trying to solve here?
Has anybody else faced this issue?
I am using libvirt-3.6.0 on Ubuntu 16.04.
Best regards,
Antoine
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