ha-policy without scale-down for a cluster

[artemisn00b <pr...@nokia.com>]

Do you think there's any advantage of using a cluster of 3 nodes, and an HA
policy - live-only, without scale down?

<ha-policy>
<live-only>
<scale-down>
<enabled>false</enabled>
<connectors>
<connector-ref>server2-connector</connector-ref>
<connector-ref>server3-connector</connector-ref>
</connectors>
</scale-down>
</live-only>
</ha-policy>

Would this serve any purpose at all? What I'm trying is, to have 1 producer
and 3 subscribers. I have 3 Artemis servers, and I want to create a system
where producer can send messages to any server, and all subscribers on the
same Topic, will receive it. 
Currently, I've setup an On-demand load balancing system with a symmetric
cluster. So I wanted to know, if the above HA-policy makes any sense to the
setup I have. I tried with and without the ha-policy, but I wanted to know
if there is any caveat to this.



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Re: ha-policy without scale-down for a cluster

[artemisn00b <pr...@nokia.com>]

Perfect, thank you!

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Re: ha-policy without scale-down for a cluster

[Justin Bertram <jb...@apache.org>]

That configuration server no purpose. The configuration would be
semantically identical if you just left it out.

For what it's worth, the HA policy has nothing to do with the use-case you
described.  HA is for dealing with broker failures, not message
distribution around a cluster.


Justin

On Wed, Mar 13, 2019 at 12:48 PM artemisn00b <pr...@nokia.com>
wrote:

> Do you think there's any advantage of using a cluster of 3 nodes, and an HA
> policy - live-only, without scale down?
>
> <ha-policy>
> <live-only>
> <scale-down>
> <enabled>false</enabled>
> <connectors>
> <connector-ref>server2-connector</connector-ref>
> <connector-ref>server3-connector</connector-ref>
> </connectors>
> </scale-down>
> </live-only>
> </ha-policy>
>
> Would this serve any purpose at all? What I'm trying is, to have 1 producer
> and 3 subscribers. I have 3 Artemis servers, and I want to create a system
> where producer can send messages to any server, and all subscribers on the
> same Topic, will receive it.
> Currently, I've setup an On-demand load balancing system with a symmetric
> cluster. So I wanted to know, if the above HA-policy makes any sense to the
> setup I have. I tried with and without the ha-policy, but I wanted to know
> if there is any caveat to this.
>
>
>
> --
> Sent from:
> http://activemq.2283324.n4.nabble.com/ActiveMQ-User-f2341805.html
>