Answering my own question, it seems that the warnings are expected as
explained by TD @
http://apache-spark-user-list.1001560.n3.nabble.com/streaming-questions-td3281.html
.
Here is what he wrote:
Spark Streaming is designed to replicate the received data within the
machines in a Spark cluster
Hi everyone
I back ported kinesis-asl to spark 1.0.2 and ran a quick test on my local
machine. It seems to be working fine but I keep getting the following
warnings. I am not sure what it means and weather it is something to worry
about or not.
2014-08-22 15:53:43,803 [pool-1-thread-7] WARN
