[jira] [Resolved] (FLINK-3435) Change interplay of Ingestion Time and Event Time

["Robert Metzger (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Metzger resolved FLINK-3435.
-----------------------------------
    Resolution: Fixed

Fixed in http://git-wip-us.apache.org/repos/asf/flink/commit/ceb64248

> Change interplay of Ingestion Time and Event Time
> -------------------------------------------------
>
>                 Key: FLINK-3435
>                 URL: https://issues.apache.org/jira/browse/FLINK-3435
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>    Affects Versions: 0.10.2
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Blocker
>             Fix For: 1.0.0
>
>
> Currently, "EventTime" and "IngestionTime" are completely the same.
> For both happens the following:
>   - Sources generate ingestion time timestamps and watermarks
>   - If a user adds a manual timestamp extractor / watermark generator, then those override the ingestion time timestamps and watermarks
>   - That implies that event time on a certain input falls back to ingestion time, if one forgets (or incorrectly uses) the timestamp extractors
>   - Also, Ingestion Time and Event Time simply mix if some inputs have timestamp assigners, and others have not.
> This behavior is quite tricky to understand. After some discussions with [~aljoscha] and [~rmetzger], we suggest to change it the following way.
>   1. On Ingestion Time, the timestamps and watermarks are generated as they are now.
>   2. On event time, no default timestamps and watermarks are generated. If a user does not implement a timestamp extractor / watermark generator, then the event time operations will fail fast.
>   3. If one wants to use ingestion time on event time settings (mix), one can use an explicit "WallClockTimetampsAndWatermark" generator.
>   4. Later, the "Ingestion Time" settings should automatically disable and user-defined timestamp extractors / assigners.



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