Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/3335
The HDFS administrator can configure the parent directory for checkpoints
with user and/or group ACL permissions. A default ACL is then inherited by the
newly created files and subdirectories therein. If you create an ACL which
blocks access for `group` and `other` the effective permissions are the
requested `700`.
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