Trying to setup consumer and producer in Kafka












0















I'm trying to make a simple producer-consumer flow over Kafka, using node-rdkafka



I'm using debug: 'all' mode, this is what I get from the logs:



Producer: test [0]: MessageSet with 1 message(s) delivered



Consumer: Fetch topic test [0] at offset 38 (v2)



The fact that the consumer is changing offset when message is produced making me believe the connection with the broker is setup and authenticated correctly.



However, for some reason I don't get the message itself in the consumer.



This event is never called:



consumer.on('data', function(m) {

    console.log("consumed", m)

});


I created a demo project for testing, you need to have a Kafka broker that supports SASL_SSL protocol in order to use it:



https://github.com/guysegal/kafka-example



Specifically, this is the consumer code:



https://github.com/guysegal/kafka-example/blob/master/src/consumer.ts



and the producer code:



https://github.com/guysegal/kafka-example/blob/master/src/producer.ts






javascript node.js apache-kafka kafka-consumer-api kafka-producer-api







share|improve this question





























    0















    I'm trying to make a simple producer-consumer flow over Kafka, using node-rdkafka



    I'm using debug: 'all' mode, this is what I get from the logs:



    Producer: test [0]: MessageSet with 1 message(s) delivered



    Consumer: Fetch topic test [0] at offset 38 (v2)



    The fact that the consumer is changing offset when message is produced making me believe the connection with the broker is setup and authenticated correctly.



    However, for some reason I don't get the message itself in the consumer.



    This event is never called:



    consumer.on('data', function(m) {
    
    console.log("consumed", m)
    
});


    I created a demo project for testing, you need to have a Kafka broker that supports SASL_SSL protocol in order to use it:



    https://github.com/guysegal/kafka-example



    Specifically, this is the consumer code:



    https://github.com/guysegal/kafka-example/blob/master/src/consumer.ts



    and the producer code:



    https://github.com/guysegal/kafka-example/blob/master/src/producer.ts






    javascript node.js apache-kafka kafka-consumer-api kafka-producer-api







    share|improve this question



























      0












      0








      0








      I'm trying to make a simple producer-consumer flow over Kafka, using node-rdkafka



      I'm using debug: 'all' mode, this is what I get from the logs:



      Producer: test [0]: MessageSet with 1 message(s) delivered



      Consumer: Fetch topic test [0] at offset 38 (v2)



      The fact that the consumer is changing offset when message is produced making me believe the connection with the broker is setup and authenticated correctly.



      However, for some reason I don't get the message itself in the consumer.



      This event is never called:



      consumer.on('data', function(m) {
      
    console.log("consumed", m)
      
});


      I created a demo project for testing, you need to have a Kafka broker that supports SASL_SSL protocol in order to use it:



      https://github.com/guysegal/kafka-example



      Specifically, this is the consumer code:



      https://github.com/guysegal/kafka-example/blob/master/src/consumer.ts



      and the producer code:



      https://github.com/guysegal/kafka-example/blob/master/src/producer.ts






      javascript node.js apache-kafka kafka-consumer-api kafka-producer-api







      share|improve this question
















      I'm trying to make a simple producer-consumer flow over Kafka, using node-rdkafka



      I'm using debug: 'all' mode, this is what I get from the logs:



      Producer: test [0]: MessageSet with 1 message(s) delivered



      Consumer: Fetch topic test [0] at offset 38 (v2)



      The fact that the consumer is changing offset when message is produced making me believe the connection with the broker is setup and authenticated correctly.



      However, for some reason I don't get the message itself in the consumer.



      This event is never called:



      consumer.on('data', function(m) {
      
    console.log("consumed", m)
      
});


      I created a demo project for testing, you need to have a Kafka broker that supports SASL_SSL protocol in order to use it:



      https://github.com/guysegal/kafka-example



      Specifically, this is the consumer code:



      https://github.com/guysegal/kafka-example/blob/master/src/consumer.ts



      and the producer code:



      https://github.com/guysegal/kafka-example/blob/master/src/producer.ts






      javascript node.js apache-kafka kafka-consumer-api kafka-producer-api




      javascript node.js apache-kafka kafka-consumer-api kafka-producer-api






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 20 '18 at 15:03









      cricket_007

      80.4k1142110




      80.4k1142110










      asked Nov 20 '18 at 6:27









      Guy SegalGuy Segal

      1951520




      1951520
























          1 Answer
          1






          active

          oldest

          votes


















          0














          You may want to set the value 'auto.offset.reset': 'earliest' and start the consumer again.



          auto.offset.reset


          This property decides the consumer starting position in case consumer starting with group which does not have last known state. For e.g. in case of new group-id id.



          The reason for changing the value of auto.offset.reset because if you produce first and starts consumer after that then topic offset has already increased and consumer will start with latest offset(increased offset) and reads the message from that point onward.



          While in case of 'earliest' consumer starts from first available message on topic.






          share|improve this answer

























            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


















            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53387406%2ftrying-to-setup-consumer-and-producer-in-kafka%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown

























            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            0














            You may want to set the value 'auto.offset.reset': 'earliest' and start the consumer again.



            auto.offset.reset


            This property decides the consumer starting position in case consumer starting with group which does not have last known state. For e.g. in case of new group-id id.



            The reason for changing the value of auto.offset.reset because if you produce first and starts consumer after that then topic offset has already increased and consumer will start with latest offset(increased offset) and reads the message from that point onward.



            While in case of 'earliest' consumer starts from first available message on topic.






            share|improve this answer






























              0














              You may want to set the value 'auto.offset.reset': 'earliest' and start the consumer again.



              auto.offset.reset


              This property decides the consumer starting position in case consumer starting with group which does not have last known state. For e.g. in case of new group-id id.



              The reason for changing the value of auto.offset.reset because if you produce first and starts consumer after that then topic offset has already increased and consumer will start with latest offset(increased offset) and reads the message from that point onward.



              While in case of 'earliest' consumer starts from first available message on topic.






              share|improve this answer




























                0












                0








                0







                You may want to set the value 'auto.offset.reset': 'earliest' and start the consumer again.



                auto.offset.reset


                This property decides the consumer starting position in case consumer starting with group which does not have last known state. For e.g. in case of new group-id id.



                The reason for changing the value of auto.offset.reset because if you produce first and starts consumer after that then topic offset has already increased and consumer will start with latest offset(increased offset) and reads the message from that point onward.



                While in case of 'earliest' consumer starts from first available message on topic.






                share|improve this answer















                You may want to set the value 'auto.offset.reset': 'earliest' and start the consumer again.



                auto.offset.reset


                This property decides the consumer starting position in case consumer starting with group which does not have last known state. For e.g. in case of new group-id id.



                The reason for changing the value of auto.offset.reset because if you produce first and starts consumer after that then topic offset has already increased and consumer will start with latest offset(increased offset) and reads the message from that point onward.



                While in case of 'earliest' consumer starts from first available message on topic.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Nov 20 '18 at 10:33

























                answered Nov 20 '18 at 10:23









                bittubittu

                342110




                342110






























                    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.




                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function () {
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53387406%2ftrying-to-setup-consumer-and-producer-in-kafka%23new-answer', 'question_page');
                    }
                    );

                    Post as a guest















                    Required, but never shown





















































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown

































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown







                    Popular posts from this blog

                    Can a sorcerer learn a 5th-level spell early by creating spell slots using the Font of Magic feature?

                    Image
                    28 6 $begingroup$ Per the Font of Magic feature, sorcerer can use Flexible Casting to create 5th-level spell slots at level 7, even though they are not typically available until level 9. You can transform unexpended sorcery points into one spell slot as a bonus action on your turn. The Creating Spell Slots table shows the cost of creating a spell slot of [5th level is 7] If such a sorcerer levels up while still having this 5th-level spell slot, can they choose a 5th-level spell as the spell they gain upon levelling up? The Spellcasting feature states: Additionally, when you gain a level in this class, you can choose one of the sorcerer spells you know and replace it with another spell from the sorcerer spell list, which also must be of a level for which you have spell slots.
                    Read more

                    Does disintegrating a polymorphed enemy still kill it after the 2018 errata?

                    Image
                    up vote 13 down vote favorite 1 After the 2018 errata, the disintegrate spell description now reads: A creature targeted by this spell must make a Dexterity saving throw. On a failed save, the target takes 10d6 + 40 force damage. The target is disintegrated if this damage leaves it with 0 hit points. If you were to polymorph an enemy into a rat and then disintegrate it, would the enemy be disintegrated or would it just return to its original form? I know that for Druids, it’s not an instant kill anymore, but is this the case for polymorph as well? dnd-5e spells polymorph errata share | improve this question edited 18 hours ago
                    Read more

                    A Topological Invariant for $pi_3(U(n))$

                    Image
                    3 3 $begingroup$ Recently, I saw a construction of topological invariant for $pi_3(U(n))$ with $ngeq 2$ : $$ N=frac{1}{24pi^2}int_{S^3} d^3x epsilon^{ijk} Tr[(U^{-1}partial_{x_i}U)(U^{-1}partial_{x_j}U)(U^{-1}partial_{x_k}U)] , $$ where $Uin U(n)$ depends on $boldsymbol{x}=(x_1,x_2,x_3)in S^3$ , $epsilon^{ijk}$ is the Levi-Civita symbol, $i,j,k=1,2,3$ , and the duplicated indexes are summed over. It is claimed that $N$ is an integer, but why? Update 02/02/2019 I think I got an argument for $n=2$ . In this case, $U=e^{i varphi} q$ with $qin SU(2)$ . Due to the trace and the Levi-Civita symbol in $N$ , $varphi$ does not contribute to $N$ . As $Tr[q^{dagger}partial_i q]=0$ and $(q^{dagger}partial_i q)^{dagger}=-q^{dagger}partial_i q$ , $q^{dagger}partial_i q$ in geneeral has the form $q^{dagger}partia
                    Read more