Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11337#discussion_r53923847
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -537,9 +537,14 @@ private[spark] class Client(
sys.env.get(envKey).foreach { path =>
val dir = new File(path)
if (dir.isDirectory()) {
- dir.listFiles().foreach { file =>
- if (file.isFile && !hadoopConfFiles.contains(file.getName())) {
- hadoopConfFiles(file.getName()) = file
+ val files = dir.listFiles()
+ if (files == null) {
+ logWarning("Failed to list files under directory " + dir)
--- End diff --
I don't think that means it (necessarily) failed; it can return null if
it's empty. I think a simple != null check is all you want here.
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