Yuri Makhno created FLINK-4616:
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Summary: Kafka consumer doesn't store last emmited watermarks per partition in state
Key: FLINK-4616
URL:
https://issues.apache.org/jira/browse/FLINK-4616 Project: Flink
Issue Type: Bug
Components: Kafka Connector
Affects Versions: 1.1.1
Reporter: Yuri Makhno
Fix For: 1.2.0, 1.1.3
Kafka consumers stores in state only kafka offsets and doesn't store last emmited watermarks, this may go to wrong state when checkpoint is restored:
Let's say our watermark is (timestamp - 10) and in case we have the following messages queue results will be different after checkpoint restore and during normal processing:
A(ts = 30)
B(ts = 35)
------ checkpoint goes here
C(ts=15) -- this one should be filtered by next time window
D(ts=60)
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