[zeromq-dev] zmq_send and zmq_rcv fail with unknown error

[Simone]

Brian Knox <briank <at> talksum.com> writes:

> 
> "Moreover, I tried changing the zmq_connect to connect to a random IP 
> address that does not exist and I still get a successfull connection but 
> obviously nothing was connected..."
> 
> This is normal / expected behavior with ZeroMQ.
> 
> As for your logstash issue, I  haven't worked with logstash before so I 
> can't hazard a guess.  However, using a ZMQ_PAIR socket to connect to 
> another process is a bit strange and I'm uncertain why you would do 
> that.  It doesn't make sense to me that logstash would listen on a 
> ZMQ_PAIR as ZMQ_PAIR is mainly for use with inter-thread message passing 
> using the inproc transport ( see the documentation at 
> http://api.zeromq.org/3-2:zmq-socket ).
> 
> On 1/10/2013 5:18 AM, Simone wrote:
> > Hi Everyone
> >
> > I am using logstash to receive logs from my application. The communication 
is
> > done using ZeroMQ. The application sends to the logstash server using 
ZMQ_PAIR.
> >
> > The connection and context creation on the application side return no error,
> > however by invoking either zmq_send or zmq_recv I get -1 and errno set to 0 
and
> > zmq_errno() set to 128.
> >
> > Unknown errors.....
> >
> > Moreover, I tried changing the zmq_connect to connect to a random IP address
> > that
> > does not exist and I still get a successfull connection but obviously 
nothing
> > was
> > connected...
> >
> > I am working on Windows x64 using ZeroMQ 2.2 on the client side (since this 
is
> > the version supported by Logstash). Logstash does not seem to be the problem
> > since I am quite sure the connection is not even established.
> >
> > I installed ZeroMQ from http://www.zeromq.org/distro:microsoft-windows using 
2.2
> > for Windows 7 and using the library libzmq-v100-mt.dll for running, 
precompiled,
> > contained in the bin directory of the installation dir.
> >
> > Any idea?
> >
> > thanks a lot
> >
> > Simone Zandara
> > Network Pogrammer - Massive Ubisoft Entertainment
> >
> > _______________________________________________
> > zeromq-dev mailing list
> > zeromq-dev <at> lists.zeromq.org
> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
> 

I see, well I dont know why but Logstash only listen on TCP connections over 
ZeroMQ.

Moreover I tried following a simple example like this 

http://learning-0mq-with-
pyzmq.readthedocs.org/en/latest/pyzmq/patterns/pair.html

Not implementing the server myself but using logstash as server.
It creates a very dummy connection over TCP. 

Hwever the link you gave me, explicitly says that PAIR is indicated for 
interproc, so I cannot really expect it to work I guess.

By the way what I am trying to do is 


 ------------                   ----------      -------------
| APPLICATION | ---ZeroMQ----> | LOGSTASH | -> |ElasticSearch|
 ------------                   ----------      -------------

Expecting ZeroMQ to implement some sort of reliable message shipping. ie. I want 
messages to be maintaned on a queue if the connection is no available or the 
remote machine crashed. Logstash is in a remote machine.

Logstash only supports three communication types

PAIR
PUSH/PULL
PUB/SUB

Shall I try another type or shall I just give up this way?