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From tillrohrmann <...@git.apache.org>
Subject [GitHub] flink pull request: Flink-3429: adds a histogram-based watermark e...
Date Mon, 21 Mar 2016 08:57:04 GMT
Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1819#discussion_r56793439
  
    --- Diff: docs/apis/streaming/event_timestamps_watermarks.md ---
    @@ -308,6 +269,89 @@ class TimeLagWatermarkGenerator extends AssignerWithPeriodicWatermarks[MyEvent]
     </div>
     
     
    +#### **With Ascending timestamps**
    +
    +The simplest special case for periodic watermark generation is the case where timestamps
within one source occur in ascending order.
    +In that case, the current timestamp can always act as a watermark, because no lower timestamps
will occur any more.
    +
    +Note that it is only necessary that timestamps are ascending *per parallel data source
instance*. For example, if
    --- End diff --
    
    Does this also holds true if a KafkaConsumer task has multiple partitions assigned?


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