title: Kafka Producer Warnings WARN [kafka-producer-network-thread ]
body: <p>I am seeing below WARN in my Kafka producer.</p>
  
  <pre><code>WARN [kafka-producer-network-thread | producer-4] o.a.k.c.NetworkClient 
  [NetworkClient.java:588] Connection to node -1 could not be 
  established. Broker may not be available.
  </code></pre>
  
  <p>Kafka Client version = 0.11.0.1
  Kafka Broker version is same as client Version.</p>
  
  <p>My Data is flowing into the kafka cluster and I am able to consume as well. But I am keep getting this errors. Any clues >\?</p>