Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4067#discussion_r23065524
--- Diff: core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala
---
@@ -179,10 +223,48 @@ object DataWriteMethod extends Enumeration with
Serializable {
*/
@DeveloperApi
case class InputMetrics(readMethod: DataReadMethod.Value) {
+
+ private val _bytesRead: AtomicLong = new AtomicLong()
+ private val _recordsRead: AtomicLong = new AtomicLong()
+
/**
* Total bytes read.
*/
- var bytesRead: Long = 0L
+ def bytesRead: Long = _bytesRead.get()
+
+ /**
+ * Total records read.
+ */
+ def recordsRead: Long = _recordsRead.get()
+ @volatile @transient var bytesReadCallback: Option[() => Long] = None
--- End diff --
can you explain what this does?
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