Hi, I didn’t define the partition size. How can I do it with kafka-clients API?
Thanks, Liel Shraga ENGINEER.SOFTWARE ENGINEERING lshr...@cisco.com Tel: +972 2 588 6394 Cisco Systems, Inc. 32 HaMelacha St., (HaSharon Bldg) P.O.Box 8735, I.Z.Sapir SOUTH NETANYA 42504 Israel cisco.com Think before you print. This email may contain confidential and privileged material for the sole use of the intended recipient. Any review, use, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender by reply email and delete all copies of this message. Please click here for Company Registration Information. -----Original Message----- From: Manikumar [mailto:manikumar.re...@gmail.com] Sent: Wednesday, September 13, 2017 11:47 AM To: users@kafka.apache.org Subject: Re: Round Robin for several consumers in KAFKA what is the partition size? you need at least 2 partitions to distribute across two consumers On Wed, Sep 13, 2017 at 1:24 PM, Liel Shraga (lshraga) <lshr...@cisco.com> wrote: > Hi, > > > > I have 5 separate docker images : 1 for kafka broker, 1 zookeeper , 1 > producer and 2 consumers. > > I publish messages to the topic via the producer. > > Basically, I would likw that the messages will be published in a round > robin algorithm, > > so for that purpose I defined the consumers with the same group.id and > added config of partition.assignment.strategy to be > org.apache.kafka.clients.consumer.RoundRobinAssignor, > > but actually only 1 consumer receive all the messages. > > *My Producer Code: * > > *public* *class* DiscoveryKafkaProducer{ > > Producer<String, String> producer; > > > > *public* DiscoveryKafkaProducer(Properties configs) { > > producer = *new* KafkaProducer<String, String>(configs); > > } > > *public* *void* send(String topic, List<String> records) { > > *for*(String record: records){ > > producer.send(*new* ProducerRecord<String, > String>(topic, record)); > > } > > producer.flush(); > > } > > > > *public* *void* close() *throws* Exception { > > producer.close(); > > } > > } > > > > *My Consumer Code:* > > *public* *static* *void* main(String[] args) { > > String server = "lshraga-ubuntu-sp-nac:9092"; > > Properties consumerConfigs = *new* Properties(); > > consumerConfigs.put("bootstrap.servers", server); > > consumerConfigs.put("key.deserializer", > "org.apache.kafka.common.serialization.StringDeserializer"); > > consumerConfigs.put("value.deserializer", > "org.apache.kafka.common.serialization.StringDeserializer"); > > consumerConfigs.put("group.id", "discovery"); > > consumerConfigs.put("client.id", "discovery"); > > consumerConfigs.put("partition.assignment.strategy", > "org.apache.kafka.clients.consumer.RoundRobinAssignor"); > > List<String> *list* = *new* ArrayList<String>(); > > DiscoveryKafkaConsumer consumer1 = *new* > DiscoveryKafkaConsumer(Collections.*singletonList*(topicName), > consumerConfigs); > > > > *try* { > > *while* (*true*) { > > System.*out*.println("Start to consume"); > > consumer1.poll(1000L); > > } > > } *catch* (InterruptedException e) { > > // *TODO* Auto-generated catch block > > e.printStackTrace(); > > } > > > > *public* *class* DiscoveryKafkaConsumer { > > Consumer<String, String> consumer; > > Integer id; > > *public* DiscoveryKafkaConsumer(List<String> topics, Properties > configs) { > > consumer = *new* KafkaConsumer<String, String>(configs); > > consumer.subscribe(topics); > > } > > > > *public* DiscoveryKafkaConsumer(*int* i, List<String> topics, > Properties configs) { > > consumer = *new* KafkaConsumer<String, String>(configs); > > consumer.subscribe(topics); > > *this*.id = i; > > } > > > > *public* *void* poll(*long* timeout) *throws* InterruptedException > { > > ConsumerRecords<String,String> records = > consumer.poll(timeout); > > System.*out*.println("Hey!Consumer #" + id + "got records:" + > records); > > Map<String, List<String>> results = *new* HashMap<String, > List<String>>(); > > records.forEach((cr) -> { > > System.*out*.println("cr.topic()=" + cr.topic()); > > List<String> list = results.get(cr.topic()); > > *if*(list == *null*) { > > list = *new* ArrayList<>(); > > results.put(cr.topic(), list); > > } > > list.add(cr.value()); > > System.*out*.println("list=" + list); > > }); > > } > > *public* *void* close() *throws* Exception { > > consumer.close(); > > } > > *What I need to add/condig in order to consume the messages in a Round > Robin ?* > > > > > > Thanks, > > > > > > [image: banner14] > > > > *Liel Shraga* > > ENGINEER.SOFTWARE ENGINEERING > > lshr...@cisco.com > > Tel: *+972 2 588 6394* > > *Cisco Systems, Inc.* > > 32 HaMelacha St., (HaSharon > <https://maps.google.com/?q=32+HaMelacha+St.,+(HaSharon&entry=gmail&so > urce=g> > Bldg) P.O.Box 8735, I.Z.Sapir > SOUTH NETANYA > 42504 > Israel > cisco.com > > > > [image: > http://www.cisco.com/assets/swa/img/thinkbeforeyouprint.gif]Think > before you print. > > This email may contain confidential and privileged material for the > sole use of the intended recipient. Any review, use, distribution or > disclosure by others is strictly prohibited. If you are not the > intended recipient (or authorized to receive for the recipient), > please contact the sender by reply email and delete all copies of this > message. > > Please click here > <http://www.cisco.com/web/about/doing_business/legal/cri/index.html> > for Company Registration Information. > > >
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