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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