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https://issues.apache.org/jira/browse/FLINK-9183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439933#comment-16439933
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ASF GitHub Bot commented on FLINK-9183:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/flink/pull/5858


> Kafka consumer docs to warn about idle partitions
> -------------------------------------------------
>
>                 Key: FLINK-9183
>                 URL: https://issues.apache.org/jira/browse/FLINK-9183
>             Project: Flink
>          Issue Type: Sub-task
>            Reporter: Juho Autio
>            Assignee: Juho Autio
>            Priority: Major
>
> Looks like the bug FLINK-5479 is entirely preventing 
> FlinkKafkaConsumerBase#assignTimestampsAndWatermarks to be used if there are 
> any idle partitions. It would be nice to mention in documentation that 
> currently this requires all subscribed partitions to have a constant stream 
> of data with growing timestamps. When watermark gets stalled on an idle 
> partition it blocks everything.
>  
> Link to current documentation:
> [https://ci.apache.org/projects/flink/flink-docs-master/dev/connectors/kafka.html#kafka-consumers-and-timestamp-extractionwatermark-emission]



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