On September 18, 2014 7:45 AM, Flavio Percoco wrote: > On 09/18/2014 04:09 PM, Gordon Sim wrote: > >> However, as far as consuming messages is concerned, it can >> guarantee once-and-only-once and/or at-least-once delivery depending on >> the message pattern used to consume messages. Using pop or claims >> guarantees the former whereas streaming messages out of Zaqar guarantees >> the later. >> >> From what I can see, pop provides unreliable delivery (i.e. its similar >> to no-ack). If the delete call using pop fails while sending back the >> response, the messages are removed but didn't get to the client. > > Correct, pop works like no-ack. If you want to have pop+ack, it is > possible to claim just 1 message and then delete it.
Having some experience using SQS I would expect that there would be a mode something like what SQS provides where a message gets picked up by one consumer (let's say by short-polling) and is hidden for a timeout duration from other consumers, so that the consumer has time to ack. Is that how you are using the term 'claim' in this case? _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
