April 2025
Intermediate to advanced
488 pages
15h 37m
Portuguese (Portugal, Brazil)
Content preview from Kafka: O Guia Definitivo, 2ª Edição
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Capítulo 4. Consumidores Kafka: Lendo dados do Kafka
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As aplicações que precisam de ler dados do Kafka utilizam um KafkaConsumer para subscrever tópicos do Kafka e receber mensagens desses tópicos. A leitura de dados do Kafka é um pouco diferente da leitura de dados de outros sistemas de mensagens, e existem alguns conceitos e ideias únicos envolvidos. Pode ser difícil entender como usar a API do consumidor sem entender esses conceitos primeiro. Começaremos por explicar alguns dos conceitos importantes e, em seguida, analisaremos alguns exemplos que mostram as diferentes formas como as APIs de consumidor podem ser utilizadas para implementar aplicações com requisitos variados.
Conceitos de consumidor Kafka
Para saberes como ler dados do Kafka, primeiro tens de compreender os seus consumidores e grupos de consumidores. As seções a seguir abordam esses conceitos.
Consumidores e grupos de consumidores
Suponha que tens uma aplicação que precisa de ler mensagens de um tópico do Kafka, executar algumas validações contra elas e escrever os resultados noutro armazenamento de dados. Neste caso, a aplicação cria um objeto consumidor, subscreve o tópico apropriado e começa a receber mensagens, a validá-las e a escrever os resultados. Isso pode funcionar bem por um tempo, mas e se a taxa na qual os produtores escrevem mensagens no tópico exceder a taxa na qual seu aplicativo ...
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