Github user indrc commented on the issue:
https://github.com/apache/flink/pull/6302
@mdaxini i don't think we have to validate the public api; with the 4 char
alphanumeric there is more than enough entropy to cover all filewrites in a
conceivable TM cluster. And to add to that, this is a best effort approach, no
harm reached if a collision happens.---
