[jira] [Created] (FLINK-4616) Kafka consumer doesn't store last emmited watermarks per partition in state

["Yuri Makhno (JIRA)" <ji...@apache.org>]

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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