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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3428) Add fixed time trailing timestamp/watermark extractor
Date Mon, 11 Apr 2016 09:24:25 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234785#comment-15234785
] 

ASF GitHub Bot commented on FLINK-3428:
---------------------------------------

Github user kl0u commented on the pull request:

    https://github.com/apache/flink/pull/1764#issuecomment-208247654
  
    Could somebody review this?


> Add fixed time trailing timestamp/watermark extractor
> -----------------------------------------------------
>
>                 Key: FLINK-3428
>                 URL: https://issues.apache.org/jira/browse/FLINK-3428
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Robert Metzger
>            Assignee: Kostas Kloudas
>
> Flink currently provides only one build-in timestamp extractor, which assumes strictly
ascending timestamps. In real world use cases, timestamps are almost never strictly ascending.
> Therefore, I propose to provide an utility watermark extractor which is generating watermarks
with a fixed-time trailing.
> The implementation should keep track of the highest event-time seen so far and subtract
a fixed amount of time from that event time.
> This way, users can for example specify that the watermarks should always "lag behind"
10 minutes.



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