Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/6243#discussion_r200015421
--- Diff:
flink-core/src/main/java/org/apache/flink/core/fs/local/LocalFileSystem.java ---
@@ -254,7 +254,7 @@ else if (file.exists() && !file.isDirectory()) {
}
else {
File parent = file.getParentFile();
- return (parent == null || mkdirsInternal(parent)) &&
file.mkdir();
+ return (parent == null || mkdirsInternal(parent)) &&
(file.mkdir() || file.isDirectory());
--- End diff --
The case we want to guard against is that another process created the
directory `file` just before calling `file.mkdir`. In this case, `file.mkdir`
would return `false`. Therefore, we need to check whether the created `file` is
really a directory. If this is the case, then we should return `true` because
the directory was created.
---
