Tao Wang created FLINK-5818:

             Summary: change checkpoint dir permission to 700 for security 
                 Key: FLINK-5818
                 URL: https://issues.apache.org/jira/browse/FLINK-5818
             Project: Flink
          Issue Type: Improvement
          Components: Security, State Backends, Checkpointing
            Reporter: Tao Wang

Now checkpoint directory is made w/o specified permission, so it is easy for 
another user to delete or read files under it, which will cause restore failure 
or information leak.

It's better to lower it down to 700.

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