[infinispan-dev] Tweaking Infinispan Server JGroups stack values

[Bela Ban]

On 01/02/16 12:46, Galder Zamarreño wrote:
> Hey Paul/Tristan,
>
> Say you have Infinispan Server installed locally, and you want to
> quickly start an instance with a lower FD_ALL.timeout,
> GMS.join_timeout, MERGE3.min_interval adn MERGE3.max_interval without
> touching the XML configuration.
>
> Is it possible to do that? Can you pass modified parameters for these
> options via system properties?

Yes, when you have
<MERGE3 max_interval="${merge3.max_interval:30000}"/>,
you can use -Dmerge3.max_interval=2000 to start.

Or, if you want to do this programmatically:
JChannel ch;
MERGE3 merge3=(MERGE3_ch.getProtocolStack().findProtocol(MERGE3.class);
merge3.setMaxInterval(2000); // or merge3.setValue("max_interval", 2000);

> I'm not looking to modify them in a particular stack but modifying
> them all stacks would be fine for me.
>
> The context for this is testing topology changes for JS client.
> Having a cluster started and running tests continously is very
> convenient for me. With that in mind, a very easy way to test
> topology changes that does not involve restarting a process is to
> suspend/resume a process (Node's child processes make this pretty
> easy to do). My intention is try to tweak the parameters above so
> that timeouts are lower and hence I can quickly force a topology
> change.
>
> Cheers, -- Galder Zamarreño Infinispan, Red Hat
>
>
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-- 
Bela Ban, JGroups lead (http://www.jgroups.org)