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https://issues.apache.org/jira/browse/FLINK-1967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614710#comment-14614710
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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-118777744
I thought about how we could change it so that the Watermarks are
transmitted "in-band" with the stream records. This would require the
StreamRecordSerializer to handle different types of records (copy, deserialize,
serialize, etc.). For this, I would propose to remove knowledge about the
StreamRecord serializer from all layers except the StreamTask layer, because it
does not work like a normal TypeSerializer anymore.
> 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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