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From zentol <...@git.apache.org>
Subject [GitHub] flink issue #5100: [FLINK-4812][metrics] Expose currentLowWatermark for all ...
Date Wed, 29 Nov 2017 15:51:34 GMT
Github user zentol commented on the issue:

    the coupling of input to output gauge becomes rather tricky. The input gauge must be reachable
in `Stream[Two]InputProcessor`, `OperatorChain#createChainedOperator`, and the output gauge
in `AbstractStreamOperator#setup`.
    For sources, sinks and watermark assigners we must refer to the same gauge in both places.
I don't see how we can do this in a nice way.
    The rather nice thing the current approach has is that everything is contained in `AbstractStreamOperator`
and isn't scattered all over the place.
    `Given that we allow people to completely re-define how operators handle watermarks, wouldn't
it make sense to give them the same freedom when it comes to the input watermark metrics?


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