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https://issues.apache.org/jira/browse/FLINK-8001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16243699#comment-16243699
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Tzu-Li (Gordon) Tai commented on FLINK-8001:
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master: 6bce2b83382640dd926c9a7860f5c10c1336450e
1.3: b307081a3fbb9f245697f4248bc8b37dad961762
> Mark Kafka Consumer as idle if it doesn't have partitions
> ---------------------------------------------------------
>
> Key: FLINK-8001
> URL: https://issues.apache.org/jira/browse/FLINK-8001
> Project: Flink
> Issue Type: Bug
> Reporter: Aljoscha Krettek
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Blocker
> Fix For: 1.4.0, 1.3.3
>
>
> In Flink 1.3.x the Kafka Consumer will emit a {{Long.MAX_VALUE}} watermark if
> it has zero partitions assigned. If this happens and other parallel instances
> of the Kafka Consumer are marked as idle (which currently never happens by
> default but does happen in custom forks of our Kafka code) this means that
> the watermark jumps to {{Long.MAX_VALUE}} downstream.
> In Flink 1.4.x this happens implicitly in the {{PeriodicWatermarkEmitter}} in
> {{AbstractFetcher}} where the watermark is {{Long.MAX_VALUE}} if we don't
> have any partitions. This should be changed to mark the source as idle
> instead, if we don't have any partitions.
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