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Posted to dev@kafka.apache.org by "Yasuhiro Matsuda (JIRA)" <ji...@apache.org> on 2015/12/11 23:42:46 UTC

[jira] [Updated] (KAFKA-2984) KTable should send old values along with new values to downstreams

     [ https://issues.apache.org/jira/browse/KAFKA-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yasuhiro Matsuda updated KAFKA-2984:
------------------------------------
    Summary: KTable should send old values along with new values to downstreams  (was: KTable should send old values to downstreams)

> KTable should send old values along with new values to downstreams
> ------------------------------------------------------------------
>
>                 Key: KAFKA-2984
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2984
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: kafka streams
>    Affects Versions: 0.9.0.1
>            Reporter: Yasuhiro Matsuda
>            Assignee: Yasuhiro Matsuda
>
> Old values are necessary for implementing aggregate functions. KTable should augment an event with its old value. Basically KTable stream is a stream of (key, (new value, old value)) internally. The old value may be omitted when it is not used in the topology.



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