<p>I am trying to set up basic Kafka with K8s. However, every time I try to connect from the data generation application with Kafka to the Kafka service in K8s I get this exception in the Kafka logs:</p>

<pre><code>2019-02-04 12:11:28 ERROR Sender:235 kafka-producer-network-thread | avro_data - [Producer clientId=avro_data] Uncaught error in kafka producer I/O thread: 
java.lang.IllegalStateException: No entry found for connection 1001
    at org.apache.kafka.clients.ClusterConnectionStates.nodeState(ClusterConnectionStates.java:330)
    at org.apache.kafka.clients.ClusterConnectionStates.disconnected(ClusterConnectionStates.java:134)
    at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:921)
    at org.apache.kafka.clients.NetworkClient.access$700(NetworkClient.java:67)
    at org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:1086)
    at org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:971)
    at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:533)
    at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:309)
    at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:233)
    at java.lang.Thread.run(Thread.java:748
</code></pre>

<p>Here is producer logs:</p>

<pre><code>[Producer clientId=avro_data] Initialize connection to node 192.168.99.100:32092 (id: -1 rack: null) for sending metadata request
Updated cluster metadata version 2 to Cluster(id = MpP-9JVnQ4a78VTtCzTm3Q, nodes = [kafka-broker-0.kafka-headless.default.svc.cluster.local:9092 (id: 1001 rack: null)], partitions = [Partition(topic = avro_topic, partition = 0, leader = 1001, replicas = [1001], isr = [1001], offlineReplicas = [])], controller = kafka-broker-0.kafka-headless.default.svc.cluster.local:9092 (id: 1001 rack: null))
[Producer clientId=avro_data] Closing the Kafka producer with timeoutMillis = 9223372036854775807 ms.
</code></pre>

<p>What could be the problem with Kafka setup or application connection?</p>

<p>I try to connect to the Kafka node port service:</p>

<pre><code>  props.put("bootstrap.servers", "192.168.99.100:32092")
    props.put("client.id", "avro_data")
    props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer")
    props.put("value.serializer", "io.confluent.kafka.serializers.KafkaAvroSerializer")
    props.put("schema.registry.url", "http://192.168.99.100:32081")
</code></pre>

<p>Kafka setup looks like this:</p>

<pre><code>apiVersion: v1
kind: Service
metadata:
  name: kafka-headless
spec:
  ports:
    - port: 9092
  clusterIP: None
  selector:
    app: kafka
---
apiVersion: v1
kind: Service
metadata:
  name: kafka-np
spec:
  ports:
    - port: 32092
      protocol: TCP
      targetPort: 9092
      nodePort: 32092
  selector:
    app: kafka
  type: NodePort
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  labels:
    app: kafka
  name: kafka-broker
spec:
  serviceName: kafka-headless
  selector:
    matchLabels:
      app: kafka
  replicas: 1
  template:
    metadata:
      labels:
        app: kafka
    spec:
      containers:
        - name: kafka
          image: confluentinc/cp-kafka:5.0.1
          env:
            - name: KAFKA_ZOOKEEPER_CONNECT
              value: zookeeper-headless:2181
            - name: MINIKUBE_IP
              value: 192.168.99.100
            - name: KAFKA_ADVERTISED_LISTENERS
              value: PLAINTEXT://kafka-broker-0.kafka-headless.default.svc.cluster.local:9092,EXTERNAL://192.168.99.100:32092
            - name: KAFKA_LISTENER_SECURITY_PROTOCOL_MAP
              value: PLAINTEXT:PLAINTEXT,EXTERNAL:PLAINTEXT
          ports:
            - containerPort: 9092
</code></pre>

<p>I ran into this issue while using the bitnami kafka &amp; zookeeper images, switching to the confluent ones (version 4.0.0) solved this in my case. Although you're already using the confluent images, try the below images/versions in your docker-compose.yml instead to iron out a bug in the version you're using.</p>

<pre><code>confluentinc/cp-zookeeper:4.0.0
confluentinc/cp-kafka:4.0.0
</code></pre>

<p><a href="https://hub.docker.com/r/confluentinc/cp-kafka" rel="nofollow noreferrer">https://hub.docker.com/r/confluentinc/cp-kafka</a></p>

<p><a href="https://hub.docker.com/r/confluentinc/cp-zookeeper" rel="nofollow noreferrer">https://hub.docker.com/r/confluentinc/cp-zookeeper</a></p>
