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List:       zeromq-dev
Subject:    Re: [zeromq-dev] ROUTER and blocking
From:       Pieter Hintjens <ph () imatix ! com>
Date:       2012-09-22 5:48:47
Message-ID: CADL5_sghftjGce3MF_gHJJe4hHMZJNDnwSNCtwWmJ3qHQDjmqg () mail ! gmail ! com
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On Sat, Sep 22, 2012 at 2:23 AM, Justin Karneges <justin@affinix.com> wrote:

> When does a write to ROUTER block? Is it if the identified connection has a
> full queue?

ROUTER sockets *drop* messages when the HWM is reached.

> Also, if the identified connection does not exist, I assume the socket drops
> the message rather than blocking until that connection appears?

Also, yes.

In fact dropping messages that can't be sent safely is a sane
response. But not by itself. You have to add some form of credit based
flow control, which can be fairly simple.

There's an older article on this here: http://unprotocols.org/blog:15

I've also been working on Chapter 6 of the Guide which goes into
detail on this: http://zguide.zeromq.org/page:all#toc129

-Pieter
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