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https://issues.apache.org/jira/browse/FLINK-1967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14611741#comment-14611741
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ASF GitHub Bot commented on FLINK-1967:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/879#issuecomment-117987956
But if you do any sort of time windowing, you have to get the time for each
record at some point. So in my opinion it does not matter where we do it so we
might as well do it in the source.
> Introduce (Event)time in Streaming
> ----------------------------------
>
> Key: FLINK-1967
> URL: https://issues.apache.org/jira/browse/FLINK-1967
> Project: Flink
> Issue Type: Improvement
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> This requires introducing a timestamp in streaming record and a change in the
> sources to add timestamps to records. This will also introduce punctuations
> (or low watermarks) to allow windows to work correctly on unordered,
> timestamped input data. In the process of this, the windowing subsystem also
> needs to be adapted to use the punctuations. Furthermore, all operators need
> to be made aware of punctuations and correctly forward them. Then, a new
> operator must be introduced to to allow modification of timestamps.
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