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https://issues.apache.org/jira/browse/FLINK-3121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15055817#comment-15055817
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Aljoscha Krettek commented on FLINK-3121:
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Correct, but I think other sources don't behave like Kafka does, in that it
knows that it will never receive data but still stays in an infinite loop
without finishing.
> Watermark forwarding does not work for sources not producing any data
> ---------------------------------------------------------------------
>
> Key: FLINK-3121
> URL: https://issues.apache.org/jira/browse/FLINK-3121
> Project: Flink
> Issue Type: Bug
> Reporter: Robert Metzger
> Assignee: Aljoscha Krettek
> Priority: Blocker
> Fix For: 1.0.0
>
>
> This mailing list discussion explains the issue in detail:
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Custom-TimestampExtractor-and-FlinkKafkaConsumer082-td3488.html
> As a workaround for now, the Kafka source can emit a final watermark for
> sources not producing any data.
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