Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/10225#discussion_r48699693
--- 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().
--- End diff --
We need to sync up the
`org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getFile()`, so
this feature can also be used within the external shuffle service in dynamic
allocation of yarn.
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