Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/962#discussion_r14207005
--- 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 --
I think it's also useful to have the size of the persisted partition
recorded. For instance, if you have data skew in the partition size and this is
why some tasks are slower than others, there is no way to discover this
currently.
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