On 05/18/15 14:09, Mark Joslin wrote:
Hi guys, I was hoping you could point me in the right direction. I
have an API server with the Play framework that uses actors. Right
now, these are just local actors but their workload is growing and
since I'm beginning to introduce more & more scheduled background
jobs, I would like it to be its own stand-alone job server.
I believe the difficulty lies in differentiating who is the API server
and who is the job server and how that relates to actor creation /
selection. Naturally, I just want the API server(s) to target the
actor systems on the job server(s). Does anyone have any experience
with this kind of job? My original thought was just to use environment
variables and say "Ok, I'm an API server, don't spin up this actor
system" OR "Ok, I'm a job server, join this actor system cluster". I
tried looking around for some resources, but didn't find anything and
was hoping you guys could help me out.
it seems like this would fit well with cluster sharding
(http://doc.akka.io/docs/akka/2.3.11/scala/cluster-usage.html#Cluster_Sharding)
and persistence
(http://doc.akka.io/docs/akka/2.3.11/scala/persistence.html). your jobs
could be cluster shard entities. on the API side, you can use sharding
proxy-only mode to route the requests from the API server to the job server.
alternatively, with some extra plumbing, you can use regular akka
cluster and give each node in the cluster a role
(http://doc.akka.io/docs/akka/2.3.11/scala/cluster-usage.html#Node_Roles).
On the API side, you can listen for cluster membership events, and
maintain a router that routes requests to the current job servers.
of the two, the first choice would be the easier one.
-Michael
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