holdenk commented on a change in pull request #30447:
URL: https://github.com/apache/spark/pull/30447#discussion_r527886821



##########
File path: core/src/main/scala/org/apache/spark/util/HadoopFSUtils.scala
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@@ -291,4 +332,22 @@ private[spark] object HadoopFSUtils extends Logging {
     resolvedLeafStatuses
   }
   // scalastyle:on argcount
+
+  /** A serializable variant of HDFS's BlockLocation. */

Review comment:
       Maybe add in a comment that says we keep these for Hadoop 2.7 combat so 
we don't make the same mistake next time?




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