Chesnay Schepler created FLINK-28538:
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Summary: Eagerly emit a watermark the first time we exceed
Long.MIN_VALUE
Key: FLINK-28538
URL: https://issues.apache.org/jira/browse/FLINK-28538
Project: Flink
Issue Type: Improvement
Components: API / DataStream
Reporter: Chesnay Schepler
Fix For: 1.16.0
The built-in watermark generators are set up to start with a Long.MIN_VALUE
watermark, that is updated on each event and periodically emitted later on.
As a result, before the first periodic emission is triggered (shortly after job
(re)start) no element is ever considered late.
We should be able to remedy that by emitting a watermark on the first event.
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