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()
         val tmpRdd = sc.textFile(tmpFilePath, numPartitions)
    +    tmpRdd.cache()
    +    tmpRdd.count()
    --- End diff --
    Because we cache the rdd in the CartesianRDD compute method, so there we 
should count the bytes read from memory.

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