Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/962#discussion_r14164719
--- Diff: core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala
---
@@ -67,6 +67,12 @@ class TaskMetrics extends Serializable {
var diskBytesSpilled: Long = _
/**
+ * If this task reads from a HadoopRDD, from cached data, or from a
parallelized collection,
--- End diff --
Hm, I'm not sure if I understand why this counts cached data as an input
source. I thought the point is to measure how many bytes are read at the
boundary between Spark and external sources?
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