Github user pwendell commented on a diff in the pull request: https://github.com/apache/spark/pull/4067#discussion_r24132189 --- Diff: core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala --- @@ -241,28 +242,29 @@ object DataWriteMethod extends Enumeration with Serializable { */ @DeveloperApi case class InputMetrics(readMethod: DataReadMethod.Value) { - - private val _bytesRead: AtomicLong = new AtomicLong() + + @volatile @transient var bytesReadCallback: Option[() => Long] = None --- End diff -- Mind adding a comment: ``` // This is volatile to make sure it's visible to updater thread ```
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