Greetings --
I'm moving here a thread started on twitter. Here's my scenario: I am
spinning up a cluster on a compute fabric that's managed by an external
component. One consequence of this configuration is that the nodes' IP
addresses and their ports aren't known a priori: they are dynamically
allocated by the external component. I have code that performs the
resolution and thus could configure the cluster nodes appropriately.
Therein lies the rub:
A. The compute fabric performs periodic health checks via HTTP (which I
implemented on top of akka-http). The external component will resolve the
allocated IP and port only *after* the first health check succeeds.
B. The resolution code queries the external component to extract the IP and
port, and then uses those values to inject
the akka.remote.netty.tcp.{hostname, port} into the actor system's config.
Both steps require an actor system, and because the values of
akka.remote.netty.tcp.{hostname, port} are not available prior to the http
listener being up and ready I can't think of a clean way to accomplish this
workflow. I see a few of workarounds; for example:
1. Factor the health check out of Akka into a different framework that
doesn't need an actor system
(https://bitbucket.org/vetler/minihttpserver/overview ???) and spin up the
actor system after the first health check succeeds
2. Use 2 actor systems: start one w/o remoting configured and answer the
health checks until the IP and port are allocated, then shut it down and
start a 2nd one configured for remoting with the acquired IP + port info as
well as ready to continue answering the health checks.
I don't know how common this scenario is. I'd be interested in your
thoughts about tackling it.
Thanks,
-Dragos
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