[
https://issues.apache.org/jira/browse/FLINK-7245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16120145#comment-16120145
]
Xingcan Cui commented on FLINK-7245:
------------------------------------
I have made some minor changes, which can be found at
[https://github.com/xccui/flink/tree/FLINK-7245|https://github.com/xccui/flink/tree/FLINK-7245],
for this issue.
It's still a work in progress and I just want to ensure that I'm moving along
the right direction. Could you have a pre-review for that? Thanks.
> 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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
