[zeromq-dev] Relation between - HI_WATER_MARK and SEND_BUFFER_SIZE of zmq ?

[Santosh N Dumbre]

Is it possible to store message to database using zmq message queue ?

Please suggest.

Regds,
Santosh d

________________________________
From: zeromq-dev-bounces at lists.zeromq.org [zeromq-dev-bounces at lists.zeromq.org] On Behalf Of Bennie Kloosteman [bklooste at gmail.com]
Sent: Tuesday, August 21, 2012 10:46 AM
To: ZeroMQ development list
Subject: Re: [zeromq-dev] Relation between - HI_WATER_MARK and SEND_BUFFER_SIZE of zmq ?

Do you need messages replayed from the database or just stored ?

If replayed to me its sounds like a queue like MSMQ ( or the IBM one) is a better fit as it does everything you want , personally i hate queues , the performance especially for persitant ones is bad and the superficial simplicty goes out the window when you get a poison message so you need a whole lot of crap to deal with that...

Ben

On Tue, Aug 21, 2012 at 12:49 PM, Santosh N Dumbre <santosh.dumbre at igate.com<mailto:santosh.dumbre at igate.com>> wrote:
Thanks a lot for the reply.

Yes, I do care for messages and want to store them to database(PostgreSql) so that I will not lose messages when  the process crashes.
Is there any existing pattern of zmq that will help me  to store the queued messages to database ?

I want a simple request-reply type application with single client and single server.

The requirement is - The messages should be queued in case of network failure / no receipt of acknowledgement from sever, and should get stored to databse after some limit.

This implementation is to be developed at client-side.

Please let me know if any existing zmq pattern will be of help in this scenario.

Thanks & Regards,
Santosh d.



________________________________
From: zeromq-dev-bounces at lists.zeromq.org<mailto:zeromq-dev-bounces at lists.zeromq.org> [zeromq-dev-bounces at lists.zeromq.org<mailto:zeromq-dev-bounces at lists.zeromq.org>] On Behalf Of Joshua Foster [jhawk28 at gmail.com<mailto:jhawk28 at gmail.com>]
Sent: Saturday, August 18, 2012 6:30 PM
To: ZeroMQ development list
Subject: Re: [zeromq-dev] Relation between - HI_WATER_MARK and SEND_BUFFER_SIZE of zmq ?

HWM is related to the max number of messages in the queue. Send buffer size is related to the max size of the message allowed to send. If HWM is set to infinite (-1), your process will eventually crash. Once it crashes, you lose all the messages in the queue. Do you have some way of recovering? Do you care if you lose messages?

Joshua

Santosh N Dumbre<mailto:santosh.dumbre at igate.com>
August 18, 2012 6:55 AM
H i,

I want to develop an client application that will send messages to the server and receive acknowledgments from the server.

The client keep getting data form real-time devices and want to send the same to the server.

The problem is if the network is down, the client application should maintain a Queue of messages and send to server when the network is up and connection becomes active.

It is a single-client to single-server application.

Can this be achieved just by using HI WATER MARK = INFINITE    ?

Can the  HI_WATER_MARK option maintain a message queue which is bigger than size of SEND_BUFFER_SIZE ?

Is there any dependency between HI_WATER_MARK  and SEND_BUFFER_SIZE  of zmq ?

Kindly reply and help.

Thanks,
Sd.



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