[jira] [Created] (FLINK-27348) Flink KafkaSource doesn't set groupId

["Ahmet Gürbüz (Jira)" <ji...@apache.org>]

Ahmet Gürbüz created FLINK-27348:
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             Summary: Flink KafkaSource doesn't set groupId
                 Key: FLINK-27348
                 URL: https://issues.apache.org/jira/browse/FLINK-27348
             Project: Flink
          Issue Type: Bug
          Components: API / Scala
    Affects Versions: 1.14.4
         Environment: OS: windows 8.1.

Java version:

java version "11.0.13" 2021-10-19 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.13+10-LTS-370)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.13+10-LTS-370, mixed mode)

 

 
            Reporter: Ahmet Gürbüz
         Attachments: image-2022-04-22-05-43-06-475.png, image-2022-04-22-05-44-56-494.png, image-2022-04-22-05-46-45-592.png

I have one very simple Flink application. I have installed kafka in my local and I am reading data from kafka with flink. I am using KafkaSource class in Flink. Although I have assigned GroupId with setGroupId, this groupId does not appear in Kafka.

 
{code:java}
object FlinkKafkaSource extends App {
  val env = StreamExecutionEnvironment.createLocalEnvironmentWithWebUI()
  case class Event(partitionNo:Long, eventTime:String, eventTimestamp:Long, userId:String, firstName:String)
  implicit val readsEvent: Reads[Event] = Json.reads[Event]

  env
    .fromSource(KafkaSource.builder[Event]
      .setBootstrapServers("localhost:9092")
      .setTopics("flink-connection")
      .setGroupId("test-group") // I can't see this groupId in kafka-consumer-groups
      .setStartingOffsets(OffsetsInitializer.latest)
      .setDeserializer(new KafkaRecordDeserializationSchema[Event] {
        override def deserialize(record: ConsumerRecord[Array[Byte], Array[Byte]], out: Collector[Event]): Unit = {
          val rec = record.value.map(_.toChar).mkString
          Try(Json.fromJson[Event](Json.parse(rec)).get) match {
            case Success(event) => out.collect(event)
            case Failure(exception) => println(s"Couldn't parse string: $rec, error: ${exception.toString}")
          }
        }
        override def getProducedType: TypeInformation[Event] = createTypeInformation[Event]
      })
      .build,
      WatermarkStrategy.noWatermarks[Event],
      "kafka-source"
    )
    .keyBy(l => l.userId)
    .print

  env.execute("flink-kafka-source")
} {code}
I have created a topic in kafka named "flink-connection".

 

I am using a simple kafka-python producer to produce data flink-connection topic.

!image-2022-04-22-05-43-06-475.png|width=762,height=161!

I am able to consume data from kafka.

!image-2022-04-22-05-44-56-494.png!

But can't see the groupId in kafka-consumer-groups

!image-2022-04-22-05-46-45-592.png!

 

 



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