vanzin commented on a change in pull request #25299: [SPARK-27651][Core] Avoid 
the network when shuffle blocks are fetched from the same host
URL: https://github.com/apache/spark/pull/25299#discussion_r315812795
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/SparkContext.scala
 ##########
 @@ -2851,6 +2851,9 @@ object SparkContext extends Logging {
               memoryPerSlaveInt, sc.executorMemory))
         }
 
+        // for local cluster mode the SHUFFLE_HOST_LOCAL_DISK_READING_ENABLED 
defaults to false
 
 Review comment:
   The comment just repeats the code. The comment should say why this is needed 
/ wanted.

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