Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4770#discussion_r25378739
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -715,12 +715,8 @@ private[spark] object Utils extends Logging {
/** Get the Yarn approved local directories. */
private def getYarnLocalDirs(conf: SparkConf): String = {
- // Hadoop 0.23 and 2.x have different Environment variable names for
the
- // local dirs, so lets check both. We assume one of the 2 is set.
- // LOCAL_DIRS => 2.X, YARN_LOCAL_DIRS => 0.23.X
- val localDirs = Option(conf.getenv("YARN_LOCAL_DIRS"))
- .getOrElse(Option(conf.getenv("LOCAL_DIRS"))
- .getOrElse(""))
+ //YarnLocalDirs must be inside container directory. Since it will be
automatically deleted when container shut downs.
+ val localDirs = Option(System.getProperty("user.dir")).getOrElse(""))
--- End diff --
The way I understand it, the shuffle service can serve the files. But the
executor still writes them directly - the write does not go through the shuffle
service, and those files are written to the directories set up by
`createLocalDirs` in DiskBlockManager.scala.
There's even a comment alluding to that in the `doStop` method:
// Only perform cleanup if an external service is not serving our
shuffle files.
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