dongjoon-hyun commented on a change in pull request #28911:
URL: https://github.com/apache/spark/pull/28911#discussion_r479698150



##########
File path: 
core/src/test/scala/org/apache/spark/storage/ShuffleBlockFetcherIteratorSuite.scala
##########
@@ -66,16 +66,24 @@ class ShuffleBlockFetcherIteratorSuite extends 
SparkFunSuite with PrivateMethodT
     transfer
   }
 
+  private def createMockBlockManager(): BlockManager = {
+    val blockManager = mock(classOf[BlockManager])
+    val localBmId = BlockManagerId("test-client", "test-local-host", 1)
+    doReturn(localBmId).when(blockManager).blockManagerId
+    // By default, the mock BlockManager returns None for hostLocalDirManager. 
One could
+    // still use initHostLocalDirManager() to specify a custom 
hostLocalDirManager.

Review comment:
       Just a question. Is there an instance which is not using this default?

##########
File path: 
core/src/test/scala/org/apache/spark/storage/ShuffleBlockFetcherIteratorSuite.scala
##########
@@ -66,16 +66,24 @@ class ShuffleBlockFetcherIteratorSuite extends 
SparkFunSuite with PrivateMethodT
     transfer
   }
 
+  private def createMockBlockManager(): BlockManager = {
+    val blockManager = mock(classOf[BlockManager])
+    val localBmId = BlockManagerId("test-client", "test-local-host", 1)
+    doReturn(localBmId).when(blockManager).blockManagerId
+    // By default, the mock BlockManager returns None for hostLocalDirManager. 
One could
+    // still use initHostLocalDirManager() to specify a custom 
hostLocalDirManager.

Review comment:
       Just a question. Currently, is there an instance which is not using this 
default?




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