anchor.diff:  
   == Adding a broker node
   
  -Now we will add a fourth node: 3.
  +Now we will add a fourth node with Id 3.
   Once the node is started and as successfully joined the cluster,
   it doesn't automatically receive partitions assignments:
   
  
positive.code: = Kafka Java Client
  :hp-tags: kafka, java
  :published_at: 2016-10-17
  :hp-image: /images/logos/kafka.png
  :sourcedir: ../sources
  
negative.code:         Topic: test_topic       Partition: 4    Leader: 1       Replicas: 1,2   Isr: 1,2
  ----
  
  image::2016-10-17-Scaling-Kafka/kafka-rack.svg[Rack awareness]
  
  == Simple scaling
  
  