Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r29284905
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
---
@@ -17,21 +17,26 @@
package org.apache.spark.deploy
+import java.io.{ByteArrayInputStream, DataInputStream}
import java.lang.reflect.Method
import java.security.PrivilegedExceptionAction
+import java.util.{Arrays, Comparator}
+import com.google.common.primitives.Longs
import org.apache.hadoop.conf.Configuration
-import org.apache.hadoop.fs.{FileStatus, FileSystem, Path}
+import org.apache.hadoop.fs.{FileStatus, FileSystem, Path, PathFilter}
import org.apache.hadoop.fs.FileSystem.Statistics
+import
org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier
import org.apache.hadoop.mapred.JobConf
import org.apache.hadoop.mapreduce.JobContext
import org.apache.hadoop.security.{Credentials, UserGroupInformation}
-import org.apache.spark.{Logging, SparkConf, SparkException}
+import org.apache.spark._
--- End diff --
could you explicitly list out the classes used here
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