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https://issues.apache.org/jira/browse/FLINK-19317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-19317:
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Labels: pull-request-available (was: )
> Make EventTime the default StreamTimeCharacteristic
> ---------------------------------------------------
>
> Key: FLINK-19317
> URL: https://issues.apache.org/jira/browse/FLINK-19317
> Project: Flink
> Issue Type: Sub-task
> Components: API / DataStream
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Priority: Major
> Labels: pull-request-available
>
> Excerpt from FLIP-134:
> {quote}
> As described above, event time is the only sensible time characteristic for
> batch. We therefore propose to change the default value of the
> StreamTimeCharacteristic from ProcessingTime to EventTime. This means the
> DataStream API programs that were using event time before now just work
> without manually changing this setting. Processing-time programs will also
> still work, because using processing-time timers is not dependent on the
> StreamTimeCharacteristic. DataStream programs that don't set a
> TimestampAssigner or WatermarkStrategy will also still work if they don't use
> operations that don't rely on (event-time) timestamps. This is true for both
> BATCH and STREAMING execution mode.
> The only real user-visible change of this is that programs that used the
> KeyedStream.timeWindow()/DataStream.timeWindow() operation, which is
> dependent on the StreamTimeCharacteristic will now use event time by default.
> We don't think this operation is useful because the behaviour can be
> surprising. We recommend users always use an explicit processing-time window
> or event-time window.
> {quote}
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