Github user ConeyLiu commented on a diff in the pull request:
    --- Diff: 
core/src/test/scala/org/apache/spark/metrics/InputOutputMetricsSuite.scala ---
    @@ -198,8 +198,12 @@ class InputOutputMetricsSuite extends SparkFunSuite 
with SharedSparkContext
         // write files to disk so we can read them later.
         val aRdd = sc.textFile(cartFilePath, numPartitions)
    +    aRdd.cache()
    +    aRdd.count()
    --- End diff --
    There is a very strange mistake. If we cache both `aRdd` & `tmpRdd`,  this 
pr and master branch all pasted the test. But if we just cache the `tmpRdd`, 
both the branch are failed. So here are temporarily set to cache. I will look 
at the details of the problem, it may be a bug, if I understand the wrong me, 
please pointer me.

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