Github user WangTaoTheTonic commented on the issue:
https://github.com/apache/flink/pull/3335
As sub dirs are created by different jobs/users under root directory, we
keep it minimum(or configurable) at creation in order to keep the data safe.
When a user has needs of accessing checkpointing files of other users,
we(admin or file owner) can give it right to access. This can be more flexible
than setting ACLs in root directory and more fine grained, because each user
can decide who can touch its checkpointing files ;)
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