Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22399#discussion_r216929186
--- Diff:
common/network-shuffle/src/test/java/org/apache/spark/network/sasl/SaslIntegrationSuite.java
---
@@ -21,6 +21,7 @@
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
+import java.util.Collections;
--- End diff --
Looks unused.
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