squito commented on a change in pull request #24499: [SPARK-25888][Core] Serve 
local disk persisted blocks by the external service after releasing executor by 
dynamic allocation
URL: https://github.com/apache/spark/pull/24499#discussion_r281823774
 
 

 ##########
 File path: 
core/src/main/scala/org/apache/spark/storage/BlockManagerMasterEndpoint.scala
 ##########
 @@ -48,6 +48,10 @@ class BlockManagerMasterEndpoint(
   // Mapping from block manager id to the block manager's information.
   private val blockManagerInfo = new mutable.HashMap[BlockManagerId, 
BlockManagerInfo]
 
+  // Mapping from external shuffle service block manager id to the block 
statuses.
+  private val blockStatusByShuffleService =
+    new mutable.HashMap[BlockManagerId, JHashMap[BlockId, BlockStatus]]
 
 Review comment:
   why a java hashmap inside a scala hashmap?

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