[jira] [Work stopped] (KAFKA-4468) Correctly calculate the window end timestamp after read from state stores

["Bill Bejeck (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-4468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on KAFKA-4468 stopped by Bill Bejeck.
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> Correctly calculate the window end timestamp after read from state stores
> -------------------------------------------------------------------------
>
>                 Key: KAFKA-4468
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4468
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Guozhang Wang
>            Assignee: Bill Bejeck
>              Labels: architecture
>
> When storing the WindowedStore on the persistent KV store, we only use the start timestamp of the window as part of the combo-key as (start-timestamp, key). The reason that we do not add the end-timestamp as well is that we can always calculate it from the start timestamp + window_length, and hence we can save 8 bytes per key on the persistent KV store.
> However, after read it (via {{WindowedDeserializer}}) we do not set its end timestamp correctly but just read it as an {{UnlimitedWindow}}. We should fix this by calculating its end timestamp as mentioned above.



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