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

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-4616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15510313#comment-15510313 ] 

Aljoscha Krettek commented on FLINK-4616:
-----------------------------------------

+1, I think this would be good to have.

> 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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