摘要：集群部署安裝依賴可以參閱支持的客戶端版本生產者連接集群，創建，生產數據。鏈接集群創建消費者自動分配，，。消費者指定消費。沒有消費組的概念，也可以認為每個消費者都屬于一個獨立消費組。

Kafka集群部署

rdkafka 依賴 libkafka

yum install rdkafka rdkafka-devel
pecl install rdkafka
php --ri rdkafka

http://pecl.php.net/package/r... 可以參閱支持的kafka客戶端版本

連接集群，創建 topic，生產數據。

setLogLevel(LOG_DEBUG);

// 鏈接kafka集群
$rk->addBrokers("192.168.20.6:9092,192.168.20.6:9093");

// 創建topic
$topic = $rk->newTopic("topic_1");

while (true) {
    $message = "hello kafka " . date("Y-m-d H:i:s");
    echo "hello kafka " . date("Y-m-d H:i:s") . PHP_EOL;

    try {
        $topic->produce(RD_KAFKA_PARTITION_UA, 0, $message);
        sleep(2);
    } catch (Exception $e) {
        echo $e->getMessage() . PHP_EOL;
    }
}

自動分配partition，rebalance，comsumer group。

setRebalanceCb(function (RdKafkaKafkaConsumer $kafka, $err, array $partitions = null) {
    switch ($err) {
        case RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS:
            echo "Assign: ";
            var_dump($partitions);
            $kafka->assign($partitions);
            break;
        case RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS:
            echo "Revoke: ";
            var_dump($partitions);
            $kafka->assign(null);
            break;
        default:
            throw new Exception($err);
    }
});

// Configure the group.id. All consumer with the same group.id will consume
// different partitions.
$conf->set("group.id", "group_1");

// Initial list of Kafka brokers
$conf->set("metadata.broker.list", "192.168.20.6:9092,192.168.20.6:9093");

$topicConf = new RdKafkaTopicConf();

// Set where to start consuming messages when there is no initial offset in
// offset store or the desired offset is out of range.
// "smallest": start from the beginning
$topicConf->set("auto.offset.reset", "smallest");

// Set the configuration to use for subscribed/assigned topics
$conf->setDefaultTopicConf($topicConf);

$consumer = new RdKafkaKafkaConsumer($conf);

// Subscribe to topic "topic_1"
$consumer->subscribe(["topic_1"]);

echo "Waiting for partition assignment... (make take some time when
";
echo "quickly re-joining the group after leaving it.)
";

while (true) {
    $message = $consumer->consume(3e3);
    switch ($message->err) {
        case RD_KAFKA_RESP_ERR_NO_ERROR:
            var_dump($message);
            break;
        case RD_KAFKA_RESP_ERR__PARTITION_EOF:
            sleep(2);
        case RD_KAFKA_RESP_ERR__TIMED_OUT:
            echo $message->errstr() . PHP_EOL;
            break;
        default:
            throw new Exception($message->errstr(), $message->err);
            break;
    }
}

指定partition消費。
php consumer_lowlevel.php [partitonNuo]
LowLevel 沒有消費組的概念，也可以認為每個消費者都屬于一個獨立消費組。

set("group.id", "group_2");

$rk = new RdKafkaConsumer($conf);
$rk->addBrokers("192.168.20.6:9092,192.168.20.6:9093");

$topicConf = new RdKafkaTopicConf();
$topicConf->set("auto.commit.interval.ms", 2000);

// Set the offset store method to "file"
// $topicConf->set("offset.store.method", "file");
// $topicConf->set("offset.store.path", sys_get_temp_dir());

// Alternatively, set the offset store method to "broker"
$topicConf->set("offset.store.method", "broker");

// Set where to start consuming messages when there is no initial offset in
// offset store or the desired offset is out of range.
// "smallest": start from the beginning
$topicConf->set("auto.offset.reset", "smallest");

$topic = $rk->newTopic($topic, $topicConf);

// Start consuming partition 0
$topic->consumeStart($partition, RD_KAFKA_OFFSET_STORED);

while (true) {
    $message = $topic->consume($partition, 3 * 1000);
    switch ($message->err) {
        case RD_KAFKA_RESP_ERR_NO_ERROR:
            var_dump($message);
            break;
        case RD_KAFKA_RESP_ERR__PARTITION_EOF:
        case RD_KAFKA_RESP_ERR__TIMED_OUT:
            echo $message->errstr() . PHP_EOL;
            break;
        default:
            throw new Exception($message->errstr(), $message->err);
            break;
    }
}