Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/16586#discussion_r97022356 --- Diff: core/src/test/scala/org/apache/spark/scheduler/SparkListenerSuite.scala --- @@ -229,7 +229,7 @@ class SparkListenerSuite extends SparkFunSuite with LocalSparkContext with Match } val numSlices = 16 - val d = sc.parallelize(0 to 1e3.toInt, numSlices).map(w) + val d = sc.parallelize(0 to 10000, numSlices).map(w) --- End diff -- I am pretty sure the deserialization time test is less flaky now assuming from the individual tests as below: **Before** - 9 failures out of 10. [1 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/546-windows-complete/job/ktdmdxkdi4ni4ier) [2 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/549-windows-complete/job/b4mqgyt72g6he7e7) [3 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/551-windows-complete/job/j0ywrgv8d733yqb4) [4 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/553-windows-complete/job/yqoapee3og5x46wk) [5 (passed)](https://ci.appveyor.com/project/spark-test/spark/build/554-windows-complete/job/g3hhdl5s8odu9ir0) [6 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/555-windows-complete/job/9utyo2glowuf3ulc) [7 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/541-windows-test/job/4gtm26hcm5327aa1) [8 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/542-windows-test/job/166i4xiljy7iof8l) [9 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/540-windows-test/job/39v7nwuq598p3rtm) [10 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/539-windows-test/job/how9cbsj5i5cykeh) **After** - 1 failure out of 7. [1 (passed)](https://ci.appveyor.com/project/spark-test/spark/build/576-windows-complete/job/9sfx150cp38ofttn) [2 (passed)](https://ci.appveyor.com/project/spark-test/spark/build/577-windows-complete/job/nrjgs7emtlnj6y5f) [3 (passed)](https://ci.appveyor.com/project/spark-test/spark/build/578-windows-complete/job/qwgsuc5uas8mk0o7) [4 (passed)](https://ci.appveyor.com/project/spark-test/spark/build/579-windows-complete/job/sf1sspisb4ai4j7r) [5 (failed)](https://ci.appveyor.com/project/spark-test/spark/build/580-windows-complete/job/808c08fvnm26w3uh) [6 (passed)](https://ci.appveyor.com/project/spark-test/spark/build/581-windows-complete/job/y7o97qq18my44dvo) [7 (passed)](https://ci.appveyor.com/project/spark-test/spark/branch/68031366-45EE-45B4-867A-40A4D9B1AD07)
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