dongjoon-hyun commented on a change in pull request #28911:
URL: https://github.com/apache/spark/pull/28911#discussion_r479690817



##########
File path: 
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/BlockStoreClient.java
##########
@@ -18,15 +18,32 @@
 package org.apache.spark.network.shuffle;
 
 import java.io.Closeable;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.Arrays;
 import java.util.Collections;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
 
 import com.codahale.metrics.MetricSet;
+import org.apache.spark.network.client.RpcResponseCallback;
+import org.apache.spark.network.client.TransportClient;
+import org.apache.spark.network.client.TransportClientFactory;
+import org.apache.spark.network.shuffle.protocol.BlockTransferMessage;
+import org.apache.spark.network.shuffle.protocol.GetLocalDirsForExecutors;
+import org.apache.spark.network.shuffle.protocol.LocalDirsForExecutors;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;

Review comment:
       Hi, @Ngone51 . Could you follow the community guide for `import` order, 
please?
   - 
https://github.com/databricks/scala-style-guide/blame/master/README.md#L403-L408
   
   For Java code, Apache Spark follows Oracle’s Java code conventions and Scala 
guidelines below. The latter is preferred. And, Apache Spark follows the 
official Scala style guide and Databricks Scala guide. The latter is preferred.




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