Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20422#discussion_r165249708
--- Diff:
core/src/test/scala/org/apache/spark/shuffle/sort/IndexShuffleBlockResolverSuite.scala
---
@@ -17,7 +17,7 @@
package org.apache.spark.shuffle.sort
-import java.io.{File, FileInputStream, FileOutputStream}
+import java.io._
--- End diff --
nit: this change is not necessary
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