Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/8760#discussion_r45760745
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
@@ -21,10 +21,12 @@ import java.util.Collections
import java.util.concurrent._
import java.util.regex.Pattern
+import scala.collection.immutable.Set
import scala.collection.mutable
import scala.collection.mutable.{ArrayBuffer, HashMap, HashSet}
import scala.collection.JavaConverters._
+
--- End diff --
nit: delete extra blank line
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