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Posted to issues@flink.apache.org by eliaslevy <gi...@git.apache.org> on 2018/05/28 18:43:44 UTC

[GitHub] flink issue #6076: [hotfix][docs] Specify operators behaviour on processing ...

Github user eliaslevy commented on the issue:

    https://github.com/apache/flink/pull/6076
  
    Thanks, that helps.
    
    Regarding debugging watermarks, at least in 1.4.2 sources did not display their emitted watermarks, although this may have been fixed in 1.5.0.  In turn, that makes jobs with task chaining turned on more difficult to debug.  It may be useful to suggest turning off task chaining for debugging.
    
    Also, the Kafka connector page discusses the fact that the Kafka source only emits watermarks as the minimum of the per partition watermark, which means an idle partition may delay watermark emission. It may be good to reiterate that behavior here, as Kafka is the most commonly used connector.



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