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Posted to dev@kafka.apache.org by "Yasuhiro Matsuda (JIRA)" <ji...@apache.org> on 2015/12/11 23:04:46 UTC

[jira] [Created] (KAFKA-2984) KTable should send old values to downstreams

Yasuhiro Matsuda created KAFKA-2984:
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             Summary: KTable should send old 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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