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https://issues.apache.org/jira/browse/SPARK-32442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165158#comment-17165158
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Apache Spark commented on SPARK-32442:
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User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/29240
> Fix TaskSetManagerSuite by hiding `org.apache.spark.FakeSchedulerBackend`
> -------------------------------------------------------------------------
>
> Key: SPARK-32442
> URL: https://issues.apache.org/jira/browse/SPARK-32442
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core, Tests
> Affects Versions: 3.1.0
> Reporter: Dongjoon Hyun
> Priority: Major
>
> There exists two FakeSchedulerBackend.
> {code}
> $ 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 {
> {code}
> Although `TaskSetManagerSuite` is inside `org.apache.spark.scheduler`
> package, `import org.apache.spark._` makes Scala 2.13 confused and causes 4
> UT failures.
> {code}
> $ 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 ***
> {code}
> This issue aims to fix that by hiding that.
> {code}
> import org.apache.spark.{FakeSchedulerBackend => _, _}
> {code}
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