我编写了以下代码,该代码使用来自KAFKA生产者的消息,该生产者不断以JSON格式发送消息。任何人都可以帮助我如何计算每秒的消息数量(这将是我设置的吞吐量)
public class FlinkStreamingJob {
public static void main(String[] args) throws Exception {
// parse input arguments
final ParameterTool parameterTool = ParameterTool.fromArgs(args);
if(parameterTool.getNumberOfParameters() < 4) {
System.out.println("Missing parameters!\nUsage: Kafka --topic <topic> " +
"--bootstrap.servers <kafka brokers> --zookeeper.connect <zk quorum> --group.id <some id>");
return;
}
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
env.getConfig().disableSysoutLogging();
env.getConfig().setRestartStrategy(RestartStrategies.fixedDelayRestart(4, 10000));
env.enableCheckpointing(1000); // create a checkpoint every 1 seconds
env.getConfig().setGlobalJobParameters(parameterTool); // make parameters available in the web interface
env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
DataStream<String> messageStream = env
.addSource(new FlinkKafkaConsumer010<>(
parameterTool.getRequired("topic"),
new SimpleStringSchema(),
parameterTool.getProperties()));
messageStream.map(new MapFunction<String, String>() {
@Override
public String map(String value) throws Exception {
JSONObject json = new JSONObject(value);
System.out.println("Time for streaming (ms): " +(System.currentTimeMillis() - json.getLong("Time")));
return value;
}
});
// write kafka stream to standard out
messageStream.print();
env.execute();
}
}
任何帮助将不胜感激。提前致谢
答案 0 :(得分:2)
开箱即用,Flink报告了一些有用的指标,包括每个运算符和任务的numRecordsInPerSecond
和numRecordsOutPerSecond
。有关内置指标的更多信息,请参阅metrics documentation,并在Web UI和/或REST API中查找数据。或者,您可以使用内置的metrics reporters。