[Spread-users] Questions about CAUSED_BY_NETWORK

andreas.ames at de.transport.bombardier.com andreas.ames at de.transport.bombardier.com
Mon Mar 11 04:33:43 EDT 2013

Hi all,

I'm a Spread newbie.  I've looked around in the net, the docs and the 
examples but I still don't crasp the CAUSED_BY_NETWORK membership 
messages, neither conceptually nor API-wise.  I've got the following 
questions about it:

1. I understand a CAUSED_BY_NETWORK can mean both that members have been 
added to and/or removed from a group, right? Can the same membership 
message mix sets of private group names for both kinds of events or 
indicates each message either/or?

2. I don't understand how to programmatically determine which private 
groups are indicated to join or to leave when I receive a 
CAUSED_BY_NETWORK membership message. I see what spuser does with it, but 
still I don't fully get it.  Could you give me some hints?

3. I got a single Spread segment on a single LAN with a daemon on each 
individual device (less than 10).  I understand that CAUSED_BY_NETWORK can 
also happen in this configuration (daemon crash, device crash, cable 
breakage, what else?), right?

I'd appreciate explanations, links to other sample code, documents 
concerning this.

Thanks in advance,


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