我将Kafka客户端从0.11.0.0更新为ConsumerConnector。
在我的旧代码中，我使用createMessageStreams来获取带有ConsumerConnector方法的消息流，然后迭代每个主题的流。但是，似乎package kafka.consumer
import ...
/**
* Main interface for consumer
*/
@deprecated("This trait has been deprecated and will be removed in a future release.", "0.11.0.0")
trait ConsumerConnector {
...
def createMessageStreams[K,V](topicCountMap: Map[String,Int],
keyDecoder: Decoder[K],
valueDecoder: Decoder[V]): Map[String,List[KafkaStream[K,V]]]
...
}
已在新API中折旧。
Client API我查找了新的API并找到了两个候选人：
Stream API
org.apache.kafka.streams中的var container = document.getElementById('container');
var span1 = document.getElementById('span1');
var span2 = document.getElementById('span2');
var output = document.getElementById('output');
function average() {
var a = parseFloat(document.getElementById('a').value);
var b = parseFloat(document.getElementById('b').value);
var c = parseFloat(document.getElementById('c').value);
var d = parseFloat(document.getElementById('d').value);
if (document.getElementById('select1').value == '1') {
span1.innerHTML = ((a+b)/(a*b)).toFixed(2);
} else if (document.getElementById('select1').value == '2') {
span1.innerHTML = ((a*b)/(a+b)).toFixed(2)
} else {
span1.innerHTML = '';
}
if (isNaN(span1.innerHTML)) {
span1.innerHTML = '';
}
if (document.getElementById('select1').value == 'none1') {
span1.innerHTML = 'None'
}
if (document.getElementById('select2').value == '3') {
span2.innerHTML = ((c+d)*100/(c*d)).toFixed(2);
} else if (document.getElementById('select2').value == '4') {
span2.innerHTML = ((c*d)*100/(c+d)).toFixed(2)
} else {
span2.innerHTML = '';
}
if (isNaN(span2.innerHTML)) {
span2.innerHTML = '';
}
if (document.getElementById('select2').value == 'none2') {
span2.innerHTML = 'None'
}
var percent = document.getElementsByClassName('percent');
for (var i = 0; percent.length > i; i++) {
if (percent.length > 0) {
output.innerHTML = percent[i]/(percent.length);
}
}
}
container.addEventListener('change', average);
container.addEventListener('input', average); 我应该使用哪一个？而且，我如何在新的Kafka API中实现相同的目标？
答案 0 :(得分：1)
新消费者的一个例子如下：
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "test");
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");
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Arrays.asList("foo", "bar"));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(100);
for (ConsumerRecord<String, String> record : records)
System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
}