Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20449#discussion_r170501479
--- Diff: core/src/test/scala/org/apache/spark/JobCancellationSuite.scala
---
@@ -18,15 +18,14 @@
package org.apache.spark
import java.util.concurrent.Semaphore
+import java.util.concurrent.atomic.AtomicInteger
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future
import scala.concurrent.duration._
-
import org.scalatest.BeforeAndAfter
import org.scalatest.Matchers
-
--- End diff --
this will break the style check
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