Kafka 阻塞问题通常是由于消费者处理速度跟不上生产者的速度,导致消费者队列堆积。为了解决这个问题,可以通过以下几种方法优化代码:
properties.put("group.id", "myGroup");
properties.put("bootstrap.servers", "localhost:9092");
properties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
properties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
properties.put("auto.offset.reset", "earliest");
properties.put("enable.auto.commit", "true");
properties.put("auto.commit.interval.ms", "1000");
properties.put("max.poll.records", "500");
properties.put("fetch.min.bytes", "1");
properties.put("fetch.max.wait.ms", "500");
while (true) {
ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
for (ConsumerRecord<String, String> record : records) {
// 处理消息逻辑
}
}
properties.put("enable.auto.commit", "false");
while (true) {
ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
for (ConsumerRecord<String, String> record : records) {
// 处理消息逻辑
}
consumer.commitSync();
}
# 增加分区数量
kafka-topics.sh --zookeeper localhost:2181 --alter --topic myTopic --partitions 20
properties.put("compression.type", "gzip");
通过以上方法,可以有效地解决 Kafka 阻塞问题。在实际应用中,需要根据具体场景选择合适的优化方案。