[GitHub] flink issue #4921: [FLINK-7943] Make ParameterTool thread safe

[tillrohrmann]

Github user tillrohrmann commented on the issue:

    https://github.com/apache/flink/pull/4921
  
    Thanks for the review @zentol. I've changed the 
`RequiredParameters#applyTo` method as you suggested and it was a less 
impacting change.


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