zhouyejoe commented on a change in pull request #32007:
URL: https://github.com/apache/spark/pull/32007#discussion_r640309963



##########
File path: 
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/protocol/PushBlockStream.java
##########
@@ -19,8 +19,6 @@
 
 import com.google.common.base.Objects;
 import io.netty.buffer.ByteBuf;
-import org.apache.commons.lang3.builder.ToStringBuilder;

Review comment:
       These two imports are not being used so I removed it. I think we need to 
clean up the unused import here since this is not original code but we 
introduced for push based shuffle. 




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