Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/3635#discussion_r21871477 --- Diff: core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala --- @@ -67,11 +67,13 @@ private[spark] class DiskBlockManager(blockManager: BlockManager, conf: SparkCon if (subDir == null) { subDir = subDirs(dirId).synchronized { val old = subDirs(dirId)(subDirId) - if (old != null) { + if (old != null && old.exists()) { old } else { val newDir = new File(localDirs(dirId), "%02x".format(subDirId)) - newDir.mkdir() + if (!newDir.exists() && !newDir.mkdir()) { --- End diff -- If execution reaches this branch, doesn't that already imply that `!newDir.exists()`? Is there a reason that this patch can't be as simple as throwing an exception if `!newDir.mkdir()`? After this check, `subDirs` will only contain the paths of directories that exist, so you won't need to perform a redundant `&& old.exists()` check up on line 70.
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