Understanding NoB

[Andreas Calvo Gómez <an...@scytl.com>]

Hello,
In the following scenario:
- 4 machines (A1, A2, A3 and CB1)
- 3 of them (A1, A2 and A3) under the same broadcast domain, with an 
embedded broker (persistent), a local consumer (durable subscriber) and 
a local producer, with multicast enabled and static network connector 
(SSL) to a central broker (CB1)
- the remaining one (CB1), is a standalone broker using SSL

Question is: after a start of all machines,
- how many and which connectors will an embedded broker see? and 
subscribers?
- how many and which connectors will the standalone broker see? and 
subscribers?
- what happens when the producer sends a message? does it gets routed

Reason is that we see two different scenarios in the embedded brokers:
- all of them have the correct connectors (to the other 2 embedded 
brokers and to the central broker)
- two of them see 3 durable subscriber: one local and two multicast
- one of them sees 3 durable subscribers: one local, one multicast and 
one to the central broker

What we see is that one of the embedded brokers logs "duplicate message 
add attempt rejected", and it increases the pending queue size (seems 
like somehow it's doing a relay of the message).

Thanks!

Re: Understanding NoB

[Andreas Calvo Gómez <an...@scytl.com>]

Missing part
On 11/02/13 15:25, Andreas Calvo Gómez wrote:
> Hello,
> In the following scenario:
> - 4 machines (A1, A2, A3 and CB1)
> - 3 of them (A1, A2 and A3) under the same broadcast domain, with an 
> embedded broker (persistent), a local consumer (durable subscriber) 
> and a local producer, with multicast enabled and static network 
> connector (SSL) to a central broker (CB1)
Multicast TTL is 1, static network connector TTL is 2.
> - the remaining one (CB1), is a standalone broker using SSL
>
> Question is: after a start of all machines,
> - how many and which connectors will an embedded broker see? and 
> subscribers?
> - how many and which connectors will the standalone broker see? and 
> subscribers?
> - what happens when the producer sends a message? does it gets routed
Does it gets routed through all available connectors?
>
> Reason is that we see two different scenarios in the embedded brokers:
> - all of them have the correct connectors (to the other 2 embedded 
> brokers and to the central broker)
> - two of them see 3 durable subscriber: one local and two multicast
> - one of them sees 3 durable subscribers: one local, one multicast and 
> one to the central broker
>
> What we see is that one of the embedded brokers logs "duplicate 
> message add attempt rejected", and it increases the pending queue size 
> (seems like somehow it's doing a relay of the message).
>
> Thanks!

-- 
Andreas Calvo Gómez
Systems Engineer
Scytl Secure Electronic Voting
Plaça Gal·la Placidia, 1-3, 1st floor · 08006 Barcelona
Phone: + 34 934 230 324
Fax:   + 34 933 251 028
http://www.scytl.com

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