dongjoon-hyun commented on a change in pull request #28911:
URL: https://github.com/apache/spark/pull/28911#discussion_r479693950



##########
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:
       This PR seems to follow the existing `import` code of 
`ExternalBlockStoreClient.java`. I believe new code had better be consistent to 
the style guide.




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