mccheah commented on a change in pull request #28618:
URL: https://github.com/apache/spark/pull/28618#discussion_r486486589



##########
File path: 
core/src/main/java/org/apache/spark/shuffle/sort/io/LocalDiskShuffleExecutorComponents.java
##########
@@ -17,69 +17,64 @@
 
 package org.apache.spark.shuffle.sort.io;
 
-import java.util.Map;
 import java.util.Optional;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
 
 import org.apache.spark.SparkConf;
 import org.apache.spark.SparkEnv;
+import org.apache.spark.shuffle.IndexShuffleBlockResolver;
 import org.apache.spark.shuffle.api.ShuffleExecutorComponents;
 import org.apache.spark.shuffle.api.ShuffleMapOutputWriter;
-import org.apache.spark.shuffle.IndexShuffleBlockResolver;
 import org.apache.spark.shuffle.api.SingleSpillShuffleMapOutputWriter;
-import org.apache.spark.storage.BlockManager;
 
 public class LocalDiskShuffleExecutorComponents implements 
ShuffleExecutorComponents {
 
   private final SparkConf sparkConf;
-  private BlockManager blockManager;
-  private IndexShuffleBlockResolver blockResolver;
+  private final Supplier<IndexShuffleBlockResolver> blockResolver;

Review comment:
       Because when you get around to actually instantiating the shuffle 
executor components, you aren't guaranteed to have an IndexShuffleBlockResolver 
available from the SparkEnv yet.




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