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Posted to issues@flink.apache.org by StephanEwen <gi...@git.apache.org> on 2016/02/01 16:04:48 UTC

[GitHub] flink pull request: [FLINK-3296] Remove 'flushing' behavior of the...

Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1563#discussion_r51428065
  
    --- Diff: docs/apis/streaming/index.md ---
    @@ -1768,6 +1768,11 @@ greater than 1, the output will also be prepended with the identifier of the tas
     </div>
     </div>
     
    +Note that the `write*()` methods on `DataStream` are mainly intended for debugging purposes.
    +They are not participating in Flink's checkpointing (no fault tolerance guarantees). The 
    --- End diff --
    
    May be worth adding that this means usually "at-least-once" , but may also mean data loss in cases where the output formats buffer data and do not immediately persist it.


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