[
https://issues.apache.org/jira/browse/FLINK-3428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179748#comment-15179748
]
ASF GitHub Bot commented on FLINK-3428:
---------------------------------------
GitHub user kl0u opened a pull request:
https://github.com/apache/flink/pull/1764
FLINK-3428: Adds a fixed time trailing watermark timestamp extractor.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kl0u/flink flink-3428
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1764.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 #1764
----
commit fd4842c29b0075531ceb9f8e1b07ae28f4c2a217
Author: kl0u <[email protected]>
Date: 2016-03-03T16:37:36Z
Adds a fixed time trailing watermark extractor.
----
> 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: Klou
>
> 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)
