[
https://issues.apache.org/jira/browse/FLINK-3428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15199312#comment-15199312
]
ASF GitHub Bot commented on FLINK-3428:
---------------------------------------
Github user kl0u commented on the pull request:
https://github.com/apache/flink/pull/1764#issuecomment-197821005
Thanks a lot @mxm @rmetzger and @StephanEwen . I agree with @mxm , that is
why I added references to the new timestampExtractor in the javadocs of the
assignTimestampsAndWatermarks() in both the java and scala APIs.
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
