Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/10225#discussion_r48699527
--- Diff:
core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala ---
@@ -53,35 +53,98 @@ private[spark] class DiskBlockManager(blockManager:
BlockManager, conf: SparkCon
private val shutdownHook = addShutdownHook()
+ private abstract class FileAllocationStrategy {
+ def apply(filename: String): File
+
+ protected def getFile(filename: String, storageDirs: Array[File]):
File = {
+ require(storageDirs.nonEmpty, "could not find file when the
directories are empty")
+
+ // Figure out which local directory it hashes to, and which
subdirectory in that
+ val hash = Utils.nonNegativeHash(filename)
+ val dirId = localDirs.indexOf(storageDirs(hash % storageDirs.length))
+ val subDirId = (hash / storageDirs.length) % subDirsPerLocalDir
+
+ // Create the subdirectory if it doesn't already exist
+ val subDir = subDirs(dirId).synchronized {
+ val old = subDirs(dirId)(subDirId)
+ if (old != null) {
+ old
+ } else {
+ val newDir = new File(localDirs(dirId), "%02x".format(subDirId))
+ if (!newDir.exists() && !newDir.mkdir()) {
+ throw new IOException(s"Failed to create local dir in
$newDir.")
+ }
+ subDirs(dirId)(subDirId) = newDir
+ newDir
+ }
+ }
+
+ new File(subDir, filename)
+ }
+ }
+
/** Looks up a file by hashing it into one of our local subdirectories.
*/
// This method should be kept in sync with
//
org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getFile().
- def getFile(filename: String): File = {
- // Figure out which local directory it hashes to, and which
subdirectory in that
- val hash = Utils.nonNegativeHash(filename)
- val dirId = hash % localDirs.length
- val subDirId = (hash / localDirs.length) % subDirsPerLocalDir
-
- // Create the subdirectory if it doesn't already exist
- val subDir = subDirs(dirId).synchronized {
- val old = subDirs(dirId)(subDirId)
- if (old != null) {
- old
- } else {
- val newDir = new File(localDirs(dirId), "%02x".format(subDirId))
- if (!newDir.exists() && !newDir.mkdir()) {
- throw new IOException(s"Failed to create local dir in $newDir.")
- }
- subDirs(dirId)(subDirId) = newDir
- newDir
+ private object hashAllocator extends FileAllocationStrategy {
+ def apply(filename: String): File = getFile(filename, localDirs)
+ }
+
+ /** Looks up a file by hierarchy way in different speed storage devices.
*/
+ private val hierarchyStore =
conf.getOption("spark.storage.hierarchyStore")
+ private class HierarchyAllocator extends FileAllocationStrategy {
+ case class LayerInfo(key: String, threshold: Long, dirs: Array[File])
+ val hsSpecs: Array[(String, Long)] =
+ // e.g.: hierarchyStore = "ssd 200GB, hdd 100GB"
+ hierarchyStore.get.trim.split(",").map {
+ s => val x = s.trim.split(" +")
+ (x(0).toLowerCase, Utils.byteStringAsGb(x(1)))
--- End diff --
`Utils.byteStringAsBytes` instead?
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