LuciferYang commented on code in PR #37345:
URL: https://github.com/apache/spark/pull/37345#discussion_r933876991
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core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala:
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@@ -23,7 +23,6 @@ import java.text.DateFormat
import java.util.{Arrays, Date, Locale}
import scala.collection.JavaConverters._
-import scala.collection.immutable.Map
Review Comment:
I'm not sure if I don't understand what you mean, but `scala.Map[K, +V]`
represents `immutable.Map[K, V]` in both Scala 2.12 and Scala 2.13 (From the
[migration
document](https://docs.scala-lang.org/overviews/core/collections-migration-213.html),
only `scala.Seq[+A]` changed from `scala.collection.Seq[A]` to
`scala.collection.immutable.Seq[A]`, `scala.Map[K, +V]` and `scala.Set[A]`
didn't.)
In addition, where `scala.collection.Map` needs to be used in spark code, we
now explicitly imports it.
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