Github user StephanEwen commented on the issue: https://github.com/apache/flink/pull/4447 Thinking more about this, I think we should modify the checkstyle to not force us to remove such `final` keywords. While being redundant in the current "snapshot" of the code, they may not be redundant in the future. I think there is a big upside of writing code in a "future proof" way. The modifiers in this class are a good example of that - the JIT friendlyness of the methods is so important that they should not be affected by future changes the class hierarchy.
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