Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/22335#discussion_r215147974
--- Diff: core/src/main/scala/org/apache/spark/status/LiveEntity.scala ---
@@ -33,7 +29,9 @@ import org.apache.spark.storage.RDDInfo
import org.apache.spark.ui.SparkUI
import org.apache.spark.util.AccumulatorContext
import org.apache.spark.util.collection.OpenHashSet
-import org.apache.spark.util.kvstore.KVStore
+
+import scala.collection.immutable.{HashSet, TreeSet}
+import scala.collection.mutable.HashMap
--- End diff --
nit: Is it necessary to change order of `import`?
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