zmq PUB/SUB drops messages when `sleep()` is not done after `send()`

What am I trying to acheive?

Reliable PUB/SUB using zmq, where the Subscribers may come and go, as they wish.

And, to simulate this pattern, more or less.

enter image description here

I realize that this question has been asked before.

Mine differs because the following code -

Does explicit synchronization using ROUTER-DEALER, to avoid slow-joiner syndrome.

Doesn't immediately close the Context/Socket after send().

import zmq

import time

import multiprocessing

from pathlib import Path



ADDR = f"ipc://{Path.home()}/.tmp/pubsubtest"

ADDR2 = f"ipc://{Path.home()}/.tmp/pairtest"





def server():

    with zmq.Context() as ctx, 

            ctx.socket(zmq.PUB) as pub, 

            ctx.socket(zmq.ROUTER) as router:



        pub.bind(ADDR)

        router.bind(ADDR2)



        i = 0

        while True:

            router.send_multipart(router.recv_multipart())

            pub.send_pyobj(i)



            # Client's don't recv anything without this!

            time.sleep(0.1)                  



            print("sent:", i)



            i += 1







def client():

    with zmq.Context() as ctx, 

            ctx.socket(zmq.SUB) as sub, 

            ctx.socket(zmq.DEALER) as dealer:



        sub.setsockopt(zmq.SUBSCRIBE, b"")

        sub.connect(ADDR)                

        dealer.connect(ADDR2)                



        dealer.send(b"")

        dealer.recv()



        print("recv:", sub.recv_pyobj())





def simulator():

    p = multiprocessing.Process(target=server)

    try:

        p.start()    

        while True:

            client()

    finally:

        p.terminate()

        p.join()



simulator()

asked Nov 13 at 18:33

Dev Aggarwal

185112

add a comment |

What am I trying to acheive?

Reliable PUB/SUB using zmq, where the Subscribers may come and go, as they wish.

And, to simulate this pattern, more or less.

enter image description here

I realize that this question has been asked before.

Mine differs because the following code -

Does explicit synchronization using ROUTER-DEALER, to avoid slow-joiner syndrome.

Doesn't immediately close the Context/Socket after send().

import zmq

import time

import multiprocessing

from pathlib import Path



ADDR = f"ipc://{Path.home()}/.tmp/pubsubtest"

ADDR2 = f"ipc://{Path.home()}/.tmp/pairtest"





def server():

    with zmq.Context() as ctx, 

            ctx.socket(zmq.PUB) as pub, 

            ctx.socket(zmq.ROUTER) as router:



        pub.bind(ADDR)

        router.bind(ADDR2)



        i = 0

        while True:

            router.send_multipart(router.recv_multipart())

            pub.send_pyobj(i)



            # Client's don't recv anything without this!

            time.sleep(0.1)                  



            print("sent:", i)



            i += 1







def client():

    with zmq.Context() as ctx, 

            ctx.socket(zmq.SUB) as sub, 

            ctx.socket(zmq.DEALER) as dealer:



        sub.setsockopt(zmq.SUBSCRIBE, b"")

        sub.connect(ADDR)                

        dealer.connect(ADDR2)                



        dealer.send(b"")

        dealer.recv()



        print("recv:", sub.recv_pyobj())





def simulator():

    p = multiprocessing.Process(target=server)

    try:

        p.start()    

        while True:

            client()

    finally:

        p.terminate()

        p.join()



simulator()

asked Nov 13 at 18:33

Dev Aggarwal

185112

add a comment |

What am I trying to acheive?

Reliable PUB/SUB using zmq, where the Subscribers may come and go, as they wish.

And, to simulate this pattern, more or less.

enter image description here

I realize that this question has been asked before.

Mine differs because the following code -

Does explicit synchronization using ROUTER-DEALER, to avoid slow-joiner syndrome.

Doesn't immediately close the Context/Socket after send().

import zmq

import time

import multiprocessing

from pathlib import Path



ADDR = f"ipc://{Path.home()}/.tmp/pubsubtest"

ADDR2 = f"ipc://{Path.home()}/.tmp/pairtest"





def server():

    with zmq.Context() as ctx, 

            ctx.socket(zmq.PUB) as pub, 

            ctx.socket(zmq.ROUTER) as router:



        pub.bind(ADDR)

        router.bind(ADDR2)



        i = 0

        while True:

            router.send_multipart(router.recv_multipart())

            pub.send_pyobj(i)



            # Client's don't recv anything without this!

            time.sleep(0.1)                  



            print("sent:", i)



            i += 1







def client():

    with zmq.Context() as ctx, 

            ctx.socket(zmq.SUB) as sub, 

            ctx.socket(zmq.DEALER) as dealer:



        sub.setsockopt(zmq.SUBSCRIBE, b"")

        sub.connect(ADDR)                

        dealer.connect(ADDR2)                



        dealer.send(b"")

        dealer.recv()



        print("recv:", sub.recv_pyobj())





def simulator():

    p = multiprocessing.Process(target=server)

    try:

        p.start()    

        while True:

            client()

    finally:

        p.terminate()

        p.join()



simulator()

asked Nov 13 at 18:33

Dev Aggarwal

185112

What am I trying to acheive?

Reliable PUB/SUB using zmq, where the Subscribers may come and go, as they wish.

And, to simulate this pattern, more or less.

enter image description here

I realize that this question has been asked before.

Mine differs because the following code -

Does explicit synchronization using ROUTER-DEALER, to avoid slow-joiner syndrome.

Doesn't immediately close the Context/Socket after send().

import zmq

import time

import multiprocessing

from pathlib import Path



ADDR = f"ipc://{Path.home()}/.tmp/pubsubtest"

ADDR2 = f"ipc://{Path.home()}/.tmp/pairtest"





def server():

    with zmq.Context() as ctx, 

            ctx.socket(zmq.PUB) as pub, 

            ctx.socket(zmq.ROUTER) as router:



        pub.bind(ADDR)

        router.bind(ADDR2)



        i = 0

        while True:

            router.send_multipart(router.recv_multipart())

            pub.send_pyobj(i)



            # Client's don't recv anything without this!

            time.sleep(0.1)                  



            print("sent:", i)



            i += 1







def client():

    with zmq.Context() as ctx, 

            ctx.socket(zmq.SUB) as sub, 

            ctx.socket(zmq.DEALER) as dealer:



        sub.setsockopt(zmq.SUBSCRIBE, b"")

        sub.connect(ADDR)                

        dealer.connect(ADDR2)                



        dealer.send(b"")

        dealer.recv()



        print("recv:", sub.recv_pyobj())





def simulator():

    p = multiprocessing.Process(target=server)

    try:

        p.start()    

        while True:

            client()

    finally:

        p.terminate()

        p.join()



simulator()

python zeromq publish-subscribe pyzmq

asked Nov 13 at 18:33

Dev Aggarwal

185112

asked Nov 13 at 18:33

Dev Aggarwal

185112

asked Nov 13 at 18:33

Dev Aggarwal

185112

asked Nov 13 at 18:33

Dev Aggarwal

185112

asked Nov 13 at 18:33

Dev Aggarwal

185112

add a comment |

active

oldest

votes

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53287435%2fzmq-pub-sub-drops-messages-when-sleep-is-not-done-after-send%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

active

oldest

votes

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

Some of your past answers have not been well-received, and you're in danger of being blocked from answering.

Please pay close attention to the following guidance:

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Agfdhyk