SPARK-11193 - Use Java ConcurrentHashMap instead of SynchronizedMap trait in order to avoid ClassCastException due to KryoSerializer in KinesisReceiver#10203

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jbonofre:SPARK-11193

Commits on Dec 11, 2015

SPARK-11193 - Use a Java ConcurrentHashMap instead of the SynchronizedMap trait in order to avoid Kryo serializer issue
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SPARK-11193 - Improve Option usage
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SPARK-11193 - Cleanup return keyword in getLatestSeqNumToCheckpoint() function
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