GitHub user tzulitai opened a pull request:

    https://github.com/apache/flink/pull/3185

    [FLINK-5375] [doc] Fix Watermark Semantics

    Fix watermark semantics in documenation to be correctly aligned with 
implementation: a Watermark _t_ declares that event time has reached time _t_ 
in that stream, meaning that there should be no more elements from the stream 
with a timestamp **t' <= t** (i.e. events with timestamps older or equal to the 
watermark).
    
    Also proof-read and corrected some mistakes in event-time / watermark 
related docs.


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/tzulitai/flink FLINK-5375

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/3185.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #3185
    
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commit a9469b982f58a37f395fb53fc7b762b557437e4f
Author: Tzu-Li (Gordon) Tai <tzuli...@apache.org>
Date:   2017-01-20T18:12:27Z

    [FLINK-5375] [doc] Fix Watermark Semantics

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