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Kafka partition扩充并且需要迁移数据 生产不用指定具体分区，会自动分配 拉取也不用指定具体分区，会自动拉多个分区
可以同时拉取多个topic
kafka配置 <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka_2.12</artifactId> <version>2.3.0</version> </dependency> Properties proprops = new Properties(); proprops.put(“bootstrap.servers”, “192.168.31.234:59092”); proprops.put(“acks”, “all”); proprops.put(“key.serializer”, “org.apache.kafka.common.serialization.StringSerializer”); proprops.put(“value.serializer”, “org.apache.kafka.common.serialization.StringSerializer”);
Producer<String, String> producer = new KafkaProducer<>(proprops); for (int i = 0; i < 9999; i ) producer.send(new ProducerRecord<String, String>(“my-topic3”, Integer.toString(i), Integer.toString(i)));
producer.close();
Properties props = new Properties(); props.put(“bootstrap.servers”, “192.168.31.234:59092”); props.put(“group.id”, “test6”); props.put(“enable.auto.commit”, “true”); props.put(“auto.commit.interval.ms”, “1000”); props.put(“key.deserializer”, “org.apache.kafka.common.serialization.StringDeserializer”); props.put(“value.deserializer”, “org.apache.kafka.common.serialization.StringDeserializer”); // props.put(“zookeeper.session.timeout.ms”, “40000”); // props.put(“zookeeper.sync.time.ms”, “200”); // props.put(“rebalance.max.retries”, “5”); // props.put(“rebalance.backoff.ms”, “12000”); KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props); // consumer.subscribe(Arrays.asList(“my-topic2”)); consumer.subscribe(Collections.singletonList(“my-topic3”));
while (true) { ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(5)); System.out.printf(“2222222222222″ records.toString()); for (ConsumerRecord<String, String> record : records) { System.out.println(“llllllllllllllllll” record); System.out.printf(“offset = %d, key = %s, value = %s%n”, record.offset(), record.key(), record.value()); } }
eureka 快速刷新配置
eureka: server: #关闭自我保护 enable-self-preservation: false #不读取只读的缓存服务清单，因为30秒刷新一次比较慢，读写高速缓存过期策略 UseReadOnlyResponseCache: false #启用主动失效，并且每次主动失效检测间隔为3s eviction-interval-timer-in-ms: 3000 instance: hostname: localhost #服务过期时间配置,超过这个时间没有接收到心跳EurekaServer就会将这个实例剔除 #注意，EurekaServer一定要设置eureka.server.eviction-interval-timer-in-ms否则这个配置无效，这个配置一般为服务刷新时间配置的三倍 #默认90s lease-expiration-duration-in-seconds: 15 #服务刷新时间配置，每隔这个时间会主动心跳一次 #默认30s lease-renewal-interval-in-seconds: 5 client: #客户端：服务缓存清单也是默认30秒更新一次，可通过设置RegistryFetchIntervalSeconds来缩短,单位是秒 registryFetchIntervalSeconds: 5 registerWithEureka: false fetchRegistry: false serviceUrl: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
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