[Akka 2.1.4] ConsistentHash router and memory issues

[gutzeit]

Hey,

I am using akka 2.1.4 (yeah, old, tell me about it) and lately been experimenting with ConsistentHashing routers.

I have two routers defined like that with, 

            /blahRouter {

                router = consistent-hashing

                nr-of-instances = 100000

                virtual-nodes-factor = 10

            }

            /blah1Router {

                router = consistent-hashing

                nr-of-instances = 100000

                virtual-nodes-factor = 10

            }

After running for a while, I do jmap to see the living objects, and to my surprise i see the following:

             instances          size

 10:      31600064     1011202048  akka.routing.ConsistentActorRef

The question is, how come there are so many those internal classes retained for at most of 200K actors ?

Am I missing anything ?

[Akka Team]

Hi Dima,

as far as I can see the implementation is quite wasteful in creating these ConsistentActorRef wrappers (100K for every message send in your case). 2.3.12 should be much smarter in this regard …

Regards,

Roland

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[Dima Gutzeit]

OMG. I better stop using ConsistentHashing routing then. Bummer.

Regards,

Dima Gutzeit

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[Roland Kuhn]

… or stop using ancient versions of Akka ;-)

Dr. Roland Kuhn
Akka Tech Lead
Typesafe – Reactive apps on the JVM.
twitter: @rolandkuhn

[Dima Gutzeit]

Lots of systems tied up on the Akka 2.1 binary protocol, not easy to migrate.

If I want to port the 2.3 implementation of ConsistentRouter to 2.1, you think it's something easy to do, or everything was changed completely ?

Regards,
Dima Gutzeit

[Konrad Malawski]

It may be possible to backport the ConsistentRouter, you can give it a shot, however it would have to be in your codebase as 2.1 has been EndOfLife-ed some time ago, we don't maintain it anymore.

For a number of other reasons (stability and perf improvements) I'd highly recommend putting an update to "latest version" note to your planning though.

As for binary compat - are you not controlling the nodes in your cluster that you say you're stuck?

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Cheers,

Konrad 'ktoso' Malawski

Akka @ Typesafe