Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/17617#discussion_r119301228
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
---
@@ -21,8 +21,10 @@ import java.io.IOException
import java.security.PrivilegedExceptionAction
import java.text.DateFormat
import java.util.{Arrays, Comparator, Date, Locale}
+import java.util.concurrent.ConcurrentHashMap
--- End diff --
nit: unneeded import.
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