Hi all, And thanks to take consideration of my spécial case ;-). Flavio say : "Yannick's message seems to imply that a subscriber can't subscribe before an external event causing a race between a publisher and the subscriber. If you solve it, for example, using bookkeeper directly as one of the options Sijie suggests, you'd end up coordinating using zookeeper or using some other coordination scheme. Yannick's case seems to be a special one."
--> you are right there is a race between subscriber and publisher, and if publisher wins, i will loose a message at least. so YES I CAN solve it with some zookeeper lock to force publisher wait a subscriber call. solution 1) of Sijie "1) have a subscription option to indicate subscribe starting from the latest sequence id or the oldest sequence id." also seem's to be a good solution for my case.
