vanzin commented on a change in pull request #25823: 
[SPARK-28211][Core][Shuffle] Propose Shuffle Driver Components API
URL: https://github.com/apache/spark/pull/25823#discussion_r328690367
 
 

 ##########
 File path: core/src/main/java/org/apache/spark/shuffle/api/ShuffleDataIO.java
 ##########
 @@ -41,9 +41,20 @@
 @Private
 public interface ShuffleDataIO {
 
+  /**
+   * The prefix of spark config keys that are passed from the driver to the 
executor.
+   */
+  String SHUFFLE_SPARK_CONF_PREFIX = "spark.shuffle.plugin.";
 
 Review comment:
   Does this need to be public? It's only used internally. Not sure of the best 
place to place this, but a public interface isn't it.

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