Github user koeninger commented on the issue:

    https://github.com/apache/spark/pull/15737
  
    In most cases poll should be returning prefetched data from the buffer, not
    waiting to talk to kafka over the network.
    
    I could see increasing it a little bit, but I don't think it should be
    increased to 10 seconds by default.  That's a really long time for a 1
    second batch streaming job to silently wait, and the only thing you'll be
    able to observe is that your job starts running slow for some unknown
    reason.  At least with a smaller default any network or Kafka issues will
    be obvious, and you can either diagnose them or tune upwards.
    
    
    On Wed, Nov 2, 2016 at 1:06 PM, Michael Armbrust <notificati...@github.com>
    wrote:
    
    > Is there are reason to not change the user facing default? Its failing our
    > tests and it was failing for me for real with the current default. When we
    > are poling on the executors, the offsets should always be available, so I
    > don't think increasing the timeout will hurt anything.
    >
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