what problem are you trying to solve with DistributedPubSub? if you are
not tolerant to losing some messages, then DistributedPubSub might not
be appropriate in your scenario.
i wouldn't depend on always being able to gracefully leave the cluster
in production! node failures and network partitions are a fact of life.
-Michael
On 07/06/15 06:08, James Carman wrote:
We are considering using the DistributedPubSub support in a production
system. We would like to be able to upgrade this system on the fly.
I am trying to get some advice on that sort of setup. What we've
seen is that when a node dies, we definitely have missed messages.
However, when I issue the "leave" command (via JMX), things appear to
clean up gracefully. Obviously, we would use the "leave" command in a
production upgrade scenario, but is there anything we can do (other
than setting up the at-least-once-delivery stuff) to get the cluster
to more gracefully recover from a node failure? I've been playing
around with this stuff using this very simple project on github:
https://github.com/jwcarman/akka-cluster-sandbox
Basically, I've set it up so that there are three "seed" nodes, which
I start up together. Then, I fire up the "client" node, which
basically just sends strings to one of the seed nodes using a
DistributedPubSubMediator.Send message.
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