[zeromq-dev] Meaning of: "Pgm-WARNING: peer expired"?

Steven McCoy steven.mccoy at miru.hk
Wed Oct 20 18:00:38 CEST 2010

On 20 October 2010 23:34, Bob Beaty <bobbeaty at comcast.net> wrote:

> Thanks for the explanation, Steve, but my underlying question is still
> there - Do I need to worry about this?

Not normally, it's a bit difficult to programmatically do anything with it.
 It might be useful for statistics, i.e. how many peers have crashed or how
many hard network faults have occurred.

> I'm not quite sure what the "peer" definition is in OpenPGM. I've got
> a sender and a receiver, and so the "peer" of the receiver (where I'm
> seeing this) is the sender? Seems unlikely naming to me.
> I'm just trying to determine the actions I might need to take when
> this happens.

Peers are other nodes on the network (by having the same data-destination
port), they can currently preempt each other to request the network layer
address from a particular source.  In larger networks peers can preempt
requesting source retransmissions.

It's easier to think of PGM as a big soup where anyone can send and receive.
 ZeroMQ only supports send-only and receive-only PGM transports though.

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