[jira] [Created] (FLINK-9183) Kafka consumer docs to warn about idle partitions

[Shang Yuanchun (Jira)]

Juho Autio created FLINK-9183:
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             Summary: 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


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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