Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/4146#discussion_r124585333
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/blob/BlobUtils.java ---
@@ -227,7 +227,7 @@ static File getStorageLocation(File storageDir, JobID
jobID, String key) {
private static File getJobDirectory(File storageDir, JobID jobID) {
final File jobDirectory = new File(storageDir, JOB_DIR_PREFIX +
jobID.toString());
- if (!jobDirectory.exists() && !jobDirectory.mkdirs()) {
--- End diff --
the new way is thread-safe - imagine a directory being concurrently created
after another thread has failed the `exists()` part - not sure we actually fix
a bug nowadays since the use may be guarded...so this is probably more of a
"just-in-case" thing or if usage patterns change
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