Github user tdas commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22042#discussion_r209473316
  
    --- Diff: 
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaDataConsumer.scala
 ---
    @@ -95,6 +106,10 @@ private[kafka010] case class InternalKafkaConsumer(
         ju.Collections.emptyIterator[ConsumerRecord[Array[Byte], Array[Byte]]]
       @volatile private var nextOffsetInFetchedData = UNKNOWN_OFFSET
     
    +  @volatile private var offsetBeforePoll: Long = UNKNOWN_OFFSET
    --- End diff --
    
    Can you add some docs to explain what these 2 vars siginify and why these 
vars are needed?


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