dongjoon-hyun commented on a change in pull request #27864: [SPARK-20732][CORE] 
Decommission cache blocks to other executors when an executor is decommissioned
URL: https://github.com/apache/spark/pull/27864#discussion_r392377634
 
 

 ##########
 File path: 
core/src/main/scala/org/apache/spark/storage/BlockManagerMessages.scala
 ##########
 @@ -36,6 +36,9 @@ private[spark] object BlockManagerMessages {
   case class ReplicateBlock(blockId: BlockId, replicas: Seq[BlockManagerId], 
maxReplicas: Int)
     extends ToBlockManagerSlave
 
+  case object DecommissionBlockManager
+    extends ToBlockManagerSlave
 
 Review comment:
   Let's make this one-liner since it's simple.

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