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https://issues.apache.org/jira/browse/FLINK-7245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16106397#comment-16106397
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Fabian Hueske commented on FLINK-7245:
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Hi [~xccui], thanks for the questions. I think you got it mostly right.
I would propose to continue this discussion on a separate JIRA about changing
the handling of time indicators.
This JIRA is about holding back watermarks which is not only useful for the
Table API / SQL.
I will open a JIRA to change the time indicator handling soon.
Thanks, Fabian
> Enhance the operators to support holding back watermarks
> --------------------------------------------------------
>
> Key: FLINK-7245
> URL: https://issues.apache.org/jira/browse/FLINK-7245
> Project: Flink
> Issue Type: New Feature
> Components: DataStream API
> Reporter: Xingcan Cui
> Assignee: Xingcan Cui
>
> Currently the watermarks are applied and emitted by the
> {{AbstractStreamOperator}} instantly.
> {code:java}
> public void processWatermark(Watermark mark) throws Exception {
> if (timeServiceManager != null) {
> timeServiceManager.advanceWatermark(mark);
> }
> output.emitWatermark(mark);
> }
> {code}
> Some calculation results (with timestamp fields) triggered by these
> watermarks (e.g., join or aggregate results) may be regarded as delayed by
> the downstream operators since their timestamps must be less than or equal to
> the corresponding triggers.
> This issue aims to add another "working mode", which supports holding back
> watermarks, to current operators. These watermarks should be blocked and
> stored by the operators until all the corresponding new generated results are
> emitted.
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