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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request #3191: [FLINK-5529] [FLINK-4752] [docs] Improve / extends...
Date Thu, 26 Jan 2017 16:32:15 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3191#discussion_r98028880
  
    --- Diff: docs/dev/windows.md ---
    @@ -795,15 +821,17 @@ necessarily the ones that arrive first or last.
     
     ## Allowed Lateness
     
    -When working with *event-time* windowing it can happen that elements arrive late, *i.e.*
the watermark that Flink uses to 
    +When working with *event-time* windowing, it can happen that elements arrive late, *i.e.*
the watermark that Flink uses to 
     keep track of the progress of event-time is already past the end timestamp of a window
to which an element belongs. See 
     [event time](./event_time.html) and especially [late elements](./event_time.html#late-elements)
for a more thorough 
     discussion of how Flink deals with event time.
     
    -By default, late elements are dropped if their associated window was already evaluated.
However, 
    +By default, late elements are dropped when the watermark is past the end of the window.
However, 
     Flink allows to specify a maximum *allowed lateness* for window operators. Allowed lateness

    -specifies by how much time elements can be late before they are dropped. Elements that
arrive 
    -within the allowed lateness of a window are still added to the window and trigger an
immediate evaluation of the window which might emit elements.
    +specifies by how much time elements can be late before they are dropped, and its default
value is 0. 
    +Elements that arrive after the watermark is past the end of the window but before it
passes the end of 
    +window plus the allowed lateness, are still added to the window. Depending on the trigger
used, 
    --- End diff --
    
    "passes the end of window" -> "**passed** the end of **the** window"


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