Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/1241#discussion_r14696189
  
    --- Diff: core/src/main/scala/org/apache/spark/storage/BlockManager.scala 
---
    @@ -72,23 +74,48 @@ private[spark] class BlockManager(
       // Actual storage of where blocks are kept
       private var tachyonInitialized = false
       private[storage] val memoryStore = new MemoryStore(this, maxMemory)
    -  private[storage] val diskStore = new DiskStore(this, diskBlockManager)
    +  private[spark] val diskStore = new DiskStore(this, diskBlockManager)
       private[storage] lazy val tachyonStore: TachyonStore = {
         val storeDir = conf.get("spark.tachyonStore.baseDir", 
"/tmp_spark_tachyon")
         val appFolderName = conf.get("spark.tachyonStore.folderName")
         val tachyonStorePath = s"$storeDir/$appFolderName/${this.executorId}"
         val tachyonMaster = conf.get("spark.tachyonStore.url",  
"tachyon://localhost:19998")
         val tachyonBlockManager =
    -      new TachyonBlockManager(shuffleBlockManager, tachyonStorePath, 
tachyonMaster)
    +      new TachyonBlockManager(this, tachyonStorePath, tachyonMaster)
         tachyonInitialized = true
         new TachyonStore(this, tachyonBlockManager)
       }
     
    +  val shuffleManager = {
    --- End diff --
    
    It would be best if we can avoid putting the shuffle manager in 
BlockManager. This violates abstraction.


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