[jira] [Commented] (KAFKA-4144) Allow per stream/table timestamp extractor

["Matthias J. Sax (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15983504#comment-15983504 ] 

Matthias J. Sax commented on KAFKA-4144:
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[~jeyhunkarimov] Why did you close the PR and set the JIRA to "fixed" -- this did not get merged yet, or did I miss something?

> Allow per stream/table timestamp extractor
> ------------------------------------------
>
>                 Key: KAFKA-4144
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4144
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>    Affects Versions: 0.10.0.1
>            Reporter: Elias Levy
>            Assignee: Jeyhun Karimov
>              Labels: api, kip
>
> At the moment the timestamp extractor is configured via a {{StreamConfig}} value to {{KafkaStreams}}. That means you can only have a single timestamp extractor per app, even though you may be joining multiple streams/tables that require different timestamp extraction methods.
> You should be able to specify a timestamp extractor via {{KStreamBuilder.stream()/table()}}, just like you can specify key and value serdes that override the StreamConfig defaults.
> KIP: https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=68714788
> Specifying a per-stream extractor should only be possible for sources, but not for intermediate topics. For PAPI we cannot enforce this, but for DSL {{through()}} should not allow to set a custom extractor by the user. In contrast, with regard to KAFKA-4785, is must internally set an extractor that returns the record's metadata timestamp in order to overwrite the global extractor from {{StreamsConfig}} (ie, set {{FailOnInvalidTimestampExtractor}}). This change should be done in KAFKA-4785 though.



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