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From StephanEwen <...@git.apache.org>
Subject [GitHub] flink pull request: FLINK-3428: Adds a fixed time trailing waterma...
Date Fri, 11 Mar 2016 18:29:19 GMT
Github user StephanEwen commented on the pull request:

    https://github.com/apache/flink/pull/1764#issuecomment-195489648
  
    I think this is a useful tool. Few comments, though:
    
      - You can still have a negative underflow (wrap around, positive) in the watermark generation.
      - We have somehow reached the conclusion to use Guava as little as possible, potentially
getting rid of it in the future.
      - If the `extractWatermark(T, long)` and `getCurrentWatermark()` method should not be
overridden, they should probably be final.
    
    
    ### About the name
    I am not sure about the name, maybe a native speaker can chime in here. My git feeling
was that this "trailing" would be understood as "event time trails by a certain amount behind
processing time".
    
    I used the term "max out of orderness" in the example in the documentation for the same
case solved here: https://ci.apache.org/projects/flink/flink-docs-release-1.0/apis/streaming/event_timestamps_watermarks.html#timestamp-assigners--watermark-generators



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