[zeromq-dev] XREP/ROUTER no longer receive messages atomically in 3.0/4.0

Brian Granger ellisonbg at gmail.com
Mon Sep 5 05:28:13 CEST 2011

>> Yes, this is also what I expected and IMO it's worth arguing this out
>> with Martin. Treating labels as a special case makes code more complex
>> without any benefit, which is a bad thing IMO.
> Okay, then I will put my official vote behind making RCVMORE as the
> sole-indicator of a contiguous message.


> This would mean that any time LABEL
> is set, MORE is also set (if I understand LABEL correctly).  Perhaps this
> would mean SNDLABEL=6, rather thank SNDLABEL=4, as it implies SNDMORE (2)?
>> > It's
>> > also not clear what the SND/RCVCMD flag is to be used for, aside from
>> > something to do with ROUTER sockets.
>> This is the 4.0 ROUTER design? Since the design is not documented
>> upfront (Martin, you really do like to communicate in code, don't you
>> :-) I've no idea what this does.
> Yes, this is the 4.0 ROUTER, which seems to get CMD messages on the
> connection of peers.  I would be very interested in seeing examples of how
> the 4.0 ROUTER improves routing compared to the 2.1 ROUTER with IDENTITIES,
> as IPython uses ROUTERs with IDENTITIES quite heavily.
>> > The simplest case seems to be that XREP sockets have a prefix of
>> > LABEL-flagged message parts, followed by some MORE-flagged parts, and a
>> > terminal part.  However, testing reveals that I can set arbitrary
>> > combinations of MORE/LABEL on each message part.  Does it make any sense
>> > to
>> > set SNDLABEL in the middle of a message?
>> Nope. This should not be allowed IMO.
> Okay, that would help simplify my goals of supporting it in recv_multipart.
>  Of course, if there is a real case where the LABEL  flag makes sense in the
> middle of a message, that's fine too.
>> -Pieter
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Brian E. Granger
Cal Poly State University, San Luis Obispo
bgranger at calpoly.edu and ellisonbg at gmail.com

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