Github user ConeyLiu commented on a diff in the pull request:
https://github.com/apache/spark/pull/17936#discussion_r117393634
--- 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.
sc.parallelize(cartVector).saveAsTextFile(cartFilePath)
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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