Data is always provided by the leader of a topic-partition (i.e. a broker).  
Here is a summary of how zookeeper is used: 
https://www.quora.com/What-is-the-actual-role-of-ZooKeeper-in-Kafka

-David


On 9/10/16, 3:47 PM, "Eric Ho" <e...@analyticsmd.com> wrote:

    I notice that some Spark programs would contact something like 'zoo1:2181'
    when trying to suck data out of Kafka.
    
    Does the kafka data actually get routed out of zookeeper before delivering
    the payload onto Spark ?
    
    -- 
    
    -eric ho
    


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