title: AWS SNS SDK not work on spark streaming
body: <p>I apply a real time anomaly detection system through spark streaming.
  In each streaming interval, if the data point is anomaly, AWS SNS send an email to subscribe accounts.
  But AWS SNS java sdk like not working in spark streaming. Below is the error message</p>
  
  <hr>
  
  <p>ERROR StreamingContext: Error starting the context, marking it as stopped
  java.io.NotSerializableException: DStream checkpointing has been enabled but the DStreams with their functions are not serializable
  com.amazonaws.services.sns.AmazonSNSClient
  Serialization stack:
      - object not serializable (class: com.amazonaws.services.sns.AmazonSNSClient, value: com.amazonaws.services.sns.AmazonSNSClient@a99e813)
      - field (class: wordCount$$anonfun$main$2, name: snsClient$1, type: class com.amazonaws.services.sns.AmazonSNSClient)
      - object (class wordCount$$anonfun$main$2, )
      - field (class: org.apache.spark.streaming.dstream.DStream$$anonfun$foreachRDD$1$$anonfun$apply$mcV$sp$3, name: cleanedF$1, type: interface scala.Function1)
      - object (class org.apache.spark.streaming.dstream.DStream$$anonfun$foreachRDD$1$$anonfun$apply$mcV$sp$3, )
      - writeObject data (class: org.apache.spark.streaming.dstream.DStream)
      - object (class org.apache.spark.streaming.dstream.ForEachDStream, org.apache.spark.streaming.dstream.ForEachDStream@5b56679b)
      - writeObject data (class: org.apache.spark.streaming.dstream.DStreamCheckpointData)
      - object (class org.apache.spark.streaming.dstream.DStreamCheckpointData, [
  0 checkpoint files </p>
  
  <hr>
  
  <p>Does anyone has any idea to solve it.. or have some other solution to send email in spark streaming</p>
  
  <p>thanks a lot</p>