Thanks very much for the prompt response, Tom. I shall go and read up on reconciliation (I'd expected there to be something like this to read). And to my knowledge, no I don't explicitly disable the implicit status acknowledgement ;)
Cheers, Jim On 18 November 2015 at 12:24, Tom Arnfeld <[email protected]> wrote: > When you construct the scheduler, are you disabling implicit > acknowledgements? > > https://github.com/apache/mesos/blob/master/include/mesos/scheduler.hpp#L373 > > I’d suggest having a read over this document, it explains some of this -> > http://mesos.apache.org/documentation/latest/reconciliation/ > > a) Mesos may re-send messages if you don’t acknowledge them, and task > status messages are guaranteed *at least once* > c) If you disable implicit status acknowledgement, yep > d) You should, they are guaranteed to be delivered *at some point* *at > least once* by the slave / master. To keep your framework in sync with > the cluster it is recommended to reconcile tasks often (as explained in the > document above) > e) http://mesos.apache.org/documentation/latest/reconciliation/ > > Hope that helps, and I think that’s all correct! The docs will be able to > clarify better :-) > > On 18 Nov 2015, at 12:09, James Vanns <[email protected]> wrote: > > Hello list. > > We have an experimental framework (C++ API) based on Mesos 0.24 and we're > seeing duplicate task status messages -- eg. 2 'FINISHED' messages for a > single task. This may well be normal behaviour but I wasn't prepared for > it. Could someone point me in the direction of a decent description on > status updates/messages somewhere in the Mesos documentation? Or explain > the following; > > a) Is this normal (it's not just the FINISHED state)? > b) What might cause this behaviour (it's intermittent)? > c) I do not explicitly acknowledge receipt of these messages - should I!? > d) Should I treat these status update messages as reliable and robust!? > e) Where can I learn more about this kind of internal detail? > > Cheers, > > Jim > > -- > Senior Code Pig > Industrial Light & Magic > > > -- -- Senior Code Pig Industrial Light & Magic
