Chesnay Schepler created FLINK-28516:
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Summary: UI is misleading when source doesn't emit watermark due
to misconfigured idleness
Key: FLINK-28516
URL: https://issues.apache.org/jira/browse/FLINK-28516
Project: Flink
Issue Type: Bug
Components: Connectors / Common, Runtime / Web Frontend
Reporter: Chesnay Schepler
Fix For: 1.16.0
When a source is not emitting watermarks because one of the readers is idle,
without idleness being set up, then the UI display this in the watermarks tab:
{code:java}
No Watermark (Watermarks are only available if EventTime is used) {code}
My immediate interpretation was that event time was not used by my job. I
understand the intention behind the event time remark, but it reads to much as
a reason as to why there is no watermark in the current job.
This could be improved by either storing a flag in the job graph for whether
event time is properly set up, or enhancing the watermarks tab to also show
output watermarks for sources.
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