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https://issues.apache.org/jira/browse/FLINK-19837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17222060#comment-17222060
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Nicholas Jiang commented on FLINK-19837:
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[~aljoscha], okay, wait for your PR ready. Thanks.
> Don't emit intermediate watermarks from watermark operators in BATCH
> execution mode
> -----------------------------------------------------------------------------------
>
> Key: FLINK-19837
> URL: https://issues.apache.org/jira/browse/FLINK-19837
> Project: Flink
> Issue Type: Sub-task
> Components: API / DataStream
> Reporter: Aljoscha Krettek
> Priority: Major
>
> Currently, both sources and watermark/timestamp operators can emit watermarks
> that we don't really need. We only need a final watermark in BATCH execution
> mode.
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