squito 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_r319560601
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/storage/BlockManager.scala
 ##########
 @@ -206,6 +206,8 @@ private[spark] class BlockManager(
     new BlockManager.RemoteBlockDownloadFileManager(this)
   private val maxRemoteBlockToMem = 
conf.get(config.MAX_REMOTE_BLOCK_SIZE_FETCH_TO_MEM)
 
+  private val executorIdToLocalDirsCache = new mutable.HashMap[String, 
Array[String]]()
 
 Review comment:
   actually we don't want to update it when an executor goes down, as the data 
is still available. (some discussion of this here: 
https://github.com/apache/spark/pull/25299#discussion_r315826558)

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