Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/3335
@WangTaoTheTonic there is no reason for Flink to support a feature which
already has proper implementations in a lower layer. Every configuration option
adds to users' cognitive load and increases the odds of misconfiguration and/or
security vulnerabilities. Apart from our discussion, as noted by @StephanEwen
if you wish to add this feature then it should be discussed first on the
mailing list.
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