[SPARK-32442] Fix TaskSetManagerSuite by hiding `org.apache.spark.FakeSchedulerBackend`

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.1.0
• Component/s: Spark Core, Tests
• Assignee: Dongjoon Hyun
• Reporter: Dongjoon Hyun
• Created: 26/Jul/20 04:19
• Updated: 26/Jul/20 14:54
• Resolved: 26/Jul/20 14:54

Description

There exists two FakeSchedulerBackend.

$ git grep "class FakeSchedulerBackend"
core/src/test/scala/org/apache/spark/HeartbeatReceiverSuite.scala:private class FakeSchedulerBackend(
core/src/test/scala/org/apache/spark/scheduler/TaskSchedulerImplSuite.scala:class FakeSchedulerBackend extends SchedulerBackend {

Although `TaskSetManagerSuite` is inside `org.apache.spark.scheduler` package, `import org.apache.spark._` makes Scala 2.13 confused and causes 4 UT failures.

$ build/mvn test -pl core --am -Pscala-2.13 -Dtest=none -DwildcardSuites=org.apache.spark.scheduler.TaskSetManagerSuite
...
Tests: succeeded 48, failed 4, canceled 0, ignored 0, pending 0
*** 4 TESTS FAILED ***

This issue aims to fix that by hiding that.

import org.apache.spark.{FakeSchedulerBackend => _, _}

Issue Links

• links to: [Github] Pull Request #29240 (dongjoon-hyun)
• links to: [Github] Pull Request #29240 (dongjoon-hyun)