Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/3765#discussion_r23256094
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
@@ -28,14 +29,13 @@ import
com.google.common.util.concurrent.ThreadFactoryBuilder
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.yarn.api.records._
-import org.apache.hadoop.yarn.api.protocolrecords.AllocateResponse
import org.apache.hadoop.yarn.client.api.AMRMClient
import org.apache.hadoop.yarn.client.api.AMRMClient.ContainerRequest
-import org.apache.hadoop.yarn.util.Records
+import org.apache.hadoop.yarn.util.RackResolver
-import org.apache.spark.{Logging, SecurityManager, SparkConf, SparkEnv}
+import org.apache.spark.{Logging, SecurityManager, SparkConf}
import org.apache.spark.deploy.yarn.YarnSparkHadoopUtil._
-import org.apache.spark.scheduler.{SplitInfo, TaskSchedulerImpl}
+import org.apache.spark.scheduler.SplitInfo
import org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend
object AllocationType extends Enumeration {
--- End diff --
this isn't used anymore - you can remove it
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