在Farn on Yarn上与Kafka并行 [英] Flink on Yarn, parallel source with Kafka

问题描述

我试图在我的Flink工作中与我的Kafka源代码保持并行，但是到目前为止我还是失败了.

I am trying to have parallelism with my Kafka source within my Flink job, but I failed so far.

我为Kafka生产者设置了4个分区:

I set 4 partitions to my Kafka producer :

$ ./bin/kafka-topics.sh --describe --zookeeper X.X.X.X:2181 --topic mytopic
Topic:mytopic   PartitionCount:4    ReplicationFactor:1 Configs:
    Topic: mytopic  Partition: 0    Leader: 0   Replicas: 0 Isr: 0
    Topic: mytopic  Partition: 1    Leader: 0   Replicas: 0 Isr: 0
    Topic: mytopic  Partition: 2    Leader: 0   Replicas: 0 Isr: 0
    Topic: mytopic  Partition: 3    Leader: 0   Replicas: 0 Isr: 0

我的scala代码如下:

My scala code is as follow :

    val env = StreamExecutionEnvironment.getExecutionEnvironment
        env.setParallelism(4)
        env.getConfig.setGlobalJobParameters(params)

    // **** Kafka CONNECTION ****
    val properties = new Properties();
    properties.setProperty("bootstrap.servers", params.get("server"));
    properties.setProperty("group.id", "test");


    // **** Get KAFKA source ****
   val stream: DataStream[String] = env.addSource(new FlinkKafkaConsumer010[String](params.get("topic"), new SimpleStringSchema(), properties))

我在YARN上工作:

$ ./bin/flink run -m yarn-cluster -yn 4 -yjm 8192 -ynm test -ys 1 -ytm 8192 myjar.jar --server X.X.X.X:9092 --topic mytopic

我尝试了很多事情，但是我的资源没有并行化:

I tried a bunch of things, but my source is not parallelized :

有几个Kafka分区，至少有那么多插槽/任务管理器应该这样做，对吧?

Having several Kafka partitions and at least as much slot / Task Managers should do it, right?

推荐答案

我遇到了同样的问题.我建议您检查两件事.

I had the same issue. I would suggest you to check two things.

1. 在实施生产者时，请检查是否为刷新到Kafka的每个记录都产生相同的键.(您应该拥有分布合理的密钥，或者只是将其设置为null).

producer.send(new ProducerRecord< String，String>("topicName"，"yourKey"，"yourMessage")

到

producer.send(new ProducerRecord< String，String>("topicName"，null，"yourMessage")

1. 检查您的Kafka生产者库版本是否与Kafka消费者库版本兼容.

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