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我正在玩KafkaStreams
和KafkaConnect
只是試圖消費來自主題的消息。我有一個爲這個話題設置的「標準」批量消費者,它的功能就像一個魅力。我首先向卡夫卡發送一些記錄,然後消耗它們。現在我想用Kakfa流做同樣的事情,但是我沒有從主題中得到一條消息。這是我正在使用的消費者代碼。KafkaStream沒有收到來自主題的任何消息
final int NUMBER_OF_PARTITIONS = 4;
final Properties consumerConfig = new Properties();
consumerConfig.setProperty("zookeeper.connect", RULE.getConfiguration().kafka.getZookeeperUrl());
consumerConfig.setProperty("backoff.increment.ms", "100");
consumerConfig.setProperty("group.id", "java-consumer-example");
consumerConfig.setProperty("consumer.timeout.ms", "1000000");
consumerConfig.setProperty("client.id", "someclient");
consumerConfig.setProperty("auto.offset.reset", "smallest");
consumerConfig.setProperty("enable.auto.commit", "false");
consumerConfig.setProperty("bootstrap.servers", RULE.getConfiguration().kafka.getHosts());
final ConsumerConnector connector = Consumer.createJavaConsumerConnector(new ConsumerConfig(consumerConfig));
final TopicFilter sourceTopicFilter = new Whitelist(RULE.getConfiguration().kafka.getTopic());
final VerifiableProperties decoderProps = new VerifiableProperties();
decoderProps.props().setProperty("schema.registry.url", RULE.getConfiguration().kafka.getRegistry());
decoderProps.props().setProperty("max.schemas.per.subject", "1");
final List<KafkaStream<String, Object>> streams = connector
.createMessageStreamsByFilter(sourceTopicFilter, NUMBER_OF_PARTITIONS, new StringDecoder(decoderProps), new KafkaAvroDecoder(decoderProps));
final ExecutorService executorService = Executors.newFixedThreadPool(NUMBER_OF_PARTITIONS);
for (final KafkaStream stream : streams) {
executorService.submit(() -> {
try {
final ConsumerIterator it = stream.iterator();
while (it.hasNext()) {
final MessageAndMetadata messageAndMetadata = it.next();
final String key = (String) messageAndMetadata.key();
System.out.println("KEY" + key);
}
} catch (final Exception ex) {
LOGGER.error("ERROR", ex);
}
});
}
我的問題是,我的代碼繼續等待it.hasNext()
條件,直到達到超時。我可能在這裏錯過了一些細節,但無法弄清楚,爲什麼我沒有從主題中得到任何東西。作爲此測試的一部分,我有一位製作人員,在消費者啓動之前將許多記錄發送到此主題中,因此它不能成爲抵消問題。任何想法都會受到高度的歡迎。