[GitHub] spark pull request: [WIP][SPARK-12196][Core] Store blocks in stora...

[yucai <gi...@git.apache.org>]

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

    https://github.com/apache/spark/pull/10225#discussion_r47181555
  
    --- Diff: core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala ---
    @@ -80,6 +77,65 @@ private[spark] class DiskBlockManager(blockManager: BlockManager, conf: SparkCon
         new File(subDir, filename)
       }
     
    +  def getFileDefault(filename: String): File = {
    +    _getFile(filename, localDirs)
    +  }
    +  var getFile = getFileDefault _
    +
    +  private val hierarchyStore = conf.getOption("spark.storage.hierarchyStore")
    +  if (hierarchyStore.isDefined) {
    +    val HSLayers: Array[(String, Long)] =
    +      hierarchyStore.get.trim.split(",").map {
    +        s => val x = s.trim.split(" +")
    +          (x(0), Utils.byteStringAsGb(x(1)))
    --- End diff --
    
    This number is the *threshold* before dropping into the next layer. 
    We do get free space by using getFreeSpace method, like in getFileHierarchy.


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