【转】c++（11）使用librdkafka库实现kafka的消费实例

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librdkafka在c语言的基础上封装了一层c++的API，可以实现kafka的消费操作，基本操作步骤如下

1、创建kafka 配置

RdKafka::Conf *conf = nullptr;
conf = RdKafka::Conf::create(RdKafka::Conf::CONF_GLOBAL);

2、设置kafka各项参数

/*设置broker list*/
conf->set("bootstrap.servers", brokers_, errstr);

/*设置consumer group*/
conf->set("group.id", groupid_, errstr);

/*每次从单个分区中拉取消息的最大尺寸*/
conf->set("max.partition.fetch.bytes", strfetch_num, errstr);

3、创建kafka topic配置
RdKafka::Conf *tconf = nullptr;
tconf = RdKafka::Conf::create(RdKafka::Conf::CONF_TOPIC);

4、设置kafka topic参数

if(tconf->set("auto.offset.reset", "smallest", errstr)

5、创建kafka consumer实例

kafka_consumer_ = RdKafka::Consumer::create(conf, errstr);

6、创建kafka topic

RdKafka::Topic::create(kafka_consumer_, topics_, tconf, errstr);

7、启动kafka consumer实例

RdKafka::ErrorCode resp = kafka_consumer_->start(topic_, partition_, offset_);

8、消费kafka

kafka_consumer_->consume(topic_, partition_, timeout_ms);

9、阻塞等待消息

kafka_consumer_->poll(0);

10、停止消费

kafka_consumer_->stop(topic_, partition_);

11、销毁consumer实例

RdKafka::wait_destroyed(5000);