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From "Evgeny Veretennikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-4468) Correctly calculate the window end timestamp after read from state stores
Date Tue, 27 Jun 2017 15:57:01 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-4468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065021#comment-16065021
] 

Evgeny Veretennikov commented on KAFKA-4468:
--------------------------------------------

[~guozhang], I'm not sure, what does it mean: "replace TimeWindow in the Windows class with
the known window_size"? I understood, that we should fill somewhere TimeWindow's endMs field,
but I'm not sure, where.

> 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
>              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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