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From tzulitai <...@git.apache.org>
Subject [GitHub] flink issue #4454: [hotfix][docs] Add section in docs about writing unit/int...
Date Fri, 04 Aug 2017 10:45:18 GMT
Github user tzulitai commented on the issue:

    https://github.com/apache/flink/pull/4454
  
    @pnowojski adding a link to `TwoPhaseCommitSinkFunctionTest` might make sense for testing
exactly-once delivery.
    
    There are also often cases where the user, in particular, wants to check that their operator
state semantics are exactly-once.
    
    However, I think we can also wait on other's opinions on whether or not this information
is really required. Instructions for watermark / timestamp testing makes sense because that's
something users frequently mess up with incorrect extractor implementations. Exactly-once
semantics, however, isn't something the user scope can touch.
    
    I'm mentioning it because we sometimes have users in the mailing lists testing exactly-once
incorrectly (maybe also because they misunderstood some concepts) and asking.


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