[erlang-questions] Load balancing/multiplexing rpc calls amongst Erlang Nodes

Paul Peregud <>
Mon Oct 22 23:22:08 CEST 2012


May you specify why load balancing should be based on time and can not
be random? Have you implemented random load balancing? Has it proved
to be insufficient?

On Mon, Oct 22, 2012 at 9:51 AM, muzaaya_joshua <> wrote:
> Building from this question (  http://stackoverflow.com/q/5339329/431620 ),
> imagine an application with N Erlang Web Servers, and N/2 Mnesia Database
> Nodes. The set up is such that the Web Servers, each, runs on its own
> hardware server (say HP DL385), and each Mnesia Instance, runs on its own
> hardware Server as well.
>
> Web Servers make rpc:call/4 calls to the back end (the Mnesia DB Servers).
> The Data is all replicated across all the Mnesia instances. Now, you want to
> have the calls being made to the Database servers, MULTIPLEXED, more
> precisely ( by TIME), on each Web Server, so that some kind of LOAD
> BALANCING is attained.
>
> If Web Server A makes a connection to Mnesia Instance 3, it cannot make the
> next connection to the same Instance. All Database Nodes need to be kept
> busy and not having any one of them idle while the others are working. The
> Load balancing Algorithm should not be random, but should be aimed at
> balancing the load on the Database Servers.
>
> Qn 1: Come up with your load balancing strategy, in such a situation. Also,
> please show with some sample illustrative code, how you would implement this
> strategy.
>
> Qn 2: If a Mnesia Instance goes down, how would your load balance Algorithm
> adapt to the changes in the cluster ?
>
> Qn 3: Is there any Erlang library aimed at load balancing of Erlang Servers
> working within the same system, and calling each other via rpc:call/4 ?
>
>
>
> --
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-- 
Best regards,
Paul Peregud
+48602112091



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