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<TITLE>RE: [Spread-users] Membership message vs regular message</TITLE>
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<P><FONT SIZE=2>Hi Yair:<BR>
<BR>
Now I understand the purpose of SELF_DISCARD message. The problem i want to address here is to eliminate communication between two publishers, as that is a waste of bandwidth, so the SELF_DISCARD message won't help me.<BR>
<BR>
However, introducing second group means another thread listening to the traffic... Is there a better way to do this?<BR>
<BR>
Regards,<BR>
Yanchao<BR>
<BR>
-----Original Message-----<BR>
From: spread-users-bounces@lists.spread.org on behalf of Guo, Yanchao<BR>
Sent: Fri 2/19/2010 5:34 AM<BR>
To: Yair Amir<BR>
Cc: spread-users@lists.spread.org<BR>
Subject: RE: [Spread-users] Membership message vs regular message<BR>
<BR>
Thanks Yair. Some comments:<BR>
<BR>
1: So you are saying that if the group_membership is set to 1, then the publisher don't have to join the group to receive the membership message?<BR>
2: I depoly my server outside my LAN and client inside my LAN. To test the failure detection, I tried two things:<BR>
a: pull out the network cable from the machine that my client is running on. In this case, both server and client is not able to receive any notification, but we I put in the cable, I received all the messages published in that interval;<BR>
b: I reset the gateway of my LAN. In this case, client doesn't receive any notification. I can't check my server as I lost all ssh session.<BR>
<BR>
In both cases, do you expect spread to detect the failure? In general, how to track the failure? I am tracking the Is_caused_network_mess messsage, is that the right way?<BR>
<BR>
Thanks.<BR>
Yanchao<BR>
<BR>
-----Original Message-----<BR>
From: Yair Amir [<A HREF="mailto:yairamir@cs.jhu.edu">mailto:yairamir@cs.jhu.edu</A>]<BR>
Sent: Friday, February 19, 2010 5:46 PM<BR>
To: Guo, Yanchao<BR>
Cc: spread-users@lists.spread.org<BR>
Subject: Re: [Spread-users] Membership message vs regular message<BR>
<BR>
Hi,<BR>
<BR>
If you have only a single publisher you can use the self-discard flag and then publisher will not receive its own messages.<BR>
<BR>
If you have more than one publisher, you can maintain a second group where publishers as well as receivers join (but no message is sent) to keep track of the membership of the main group.<BR>
<BR>
Also - I think there is a slight inaccuracy in previous posts - Spread will detect failures even if you are not sending traffic if you run a daemon on the failed (or partitioned) machine and connect locally.<BR>
My understanding is that he only case where Spread does not immediately detect a failure is in certain setups where you have a client that connects to Spread remotely via TCP (with a remote daemon) and the client machine is partitioned.<BR>
This is a TCP/socket issue rather than a Spread issue.<BR>
<BR>
Cheers,<BR>
<BR>
:) Yair.<BR>
<BR>
On 2/19/10 2:29 AM, Guo, Yanchao wrote:<BR>
> Hi all, for my publisher application, I want it got notification when<BR>
> some listeners joined the group. To do that, my publisher application<BR>
> have to join the same group and receive messages. But the message the<BR>
> publisher receives include both membership message and regular message.<BR>
><BR>
> How can I configure my publisher application to only receive<BR>
> membership messages?<BR>
><BR>
> Thanks.<BR>
> Yanchao<BR>
><BR>
><BR>
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