@Test void whenSendingMessagesOnTwoTopics_thenConsumerReceivesMessages() throws Exception { publishMessages(); kafkaConsumer.subscribe(Arrays.asList("card-payments", "bank-transfers")); int eventsProcessed = 0; for (ConsumerRecord<String, String> record : kafkaConsumer.poll(Duration.ofSeconds(10)))...
下面是一个使用kafka-python库同时消费多个主题的示例代码: fromkafkaimportKafkaConsumerclassKafkaConsumer:def__init__(self,bootstrap_servers):self.consumer=KafkaConsumer(bootstrap_servers=bootstrap_servers)defconsume_topics(self,topics):self.consumer.subscribe(topics)try:formessageinself.consumer:print(f"T...
for(ConsumerPartitionAssignorassignor:assignors){Subscriptionsubscription=newSubscription(topics,assignor.subscriptionUserData(joinedSubscription),subscriptions.assignedPartitionsList(),generation().generationId,rackId);ByteBuffermetadata=ConsumerProtocol.serializeSubscription(subscription);protocolSet.add(newJoinGroupRequestD...
As we saw in the previous section, consumers in a consumer group share ownership of the partitions in the topics they subscribe to.When we add a new consumer to the group, it starts consuming messages from partitions previously consumed by another consumer. The same thing happens when a consum...
Multiple Topics Within a Consumer Group The other tricky design consideration is that each member of a Consumer Group may subscribe to some, but not all, of the topics being handled in the group. This makes thinking about distribution a little complex. In a simple case of a Consumer Group ...
("User configured " + ConsumerConfig.PARTITION_ASSIGNMENT_STRATEGY_CONFIG +" to empty while trying to subscribe for group protocol to auto assign partitions");}// Always update the heartbeat last poll time so that the heartbeat thread does not leave the// group proactively due to application ...
KafkaConsuner<String, String> consumer = new KafkaConsumer<String, String>(props); //2.订阅Topic //创建一个只包含单个元素的列表,Topic的名字叫作customerCountries consumer.subscribe(Collections.singletonList("customerCountries")); //支持正则表达式,订阅所有与test相关的Topic ...
toSend:指定全量/增量的topic partition信息;初始时是全量,即consumer需要消费的所有topic partition信息 toForget:需要移除的topic partition信息;初始时为空,即经过重平衡后由这个consumer分配出去的topic partition信息 toReplace:topic id相关,需要较高版本的broken支持,暂不考虑 ...
Group can subscribe to multiple Topic at the same time, and a Topic can also be subscribed to multiple Consumer Groups at the same time. Although a Topic can be subscribed by multiple Consumer Groups at the same time, the Topic can only be consumed by any Consumer in the same Consumer ...
The consumer group concept in Kafka generalizes these two concepts. As with a queue the consumer group allows you to divide up processing over a collection of processes (the members of the consumer group). As with publish-subscribe, Kafka allows you to broadcast messages to multiple consumer gro...