[jira] [Updated] (KAFKA-4556) unordered messages when multiple topics are combined in single topic through stream

["Savdeep Singh (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-4556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Savdeep Singh updated KAFKA-4556:
---------------------------------
    Attachment: stream topology.png

Stream topology example

> unordered messages when multiple topics are combined in single topic through stream
> -----------------------------------------------------------------------------------
>
>                 Key: KAFKA-4556
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4556
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer, producer , streams
>    Affects Versions: 0.10.0.1
>            Reporter: Savdeep Singh
>         Attachments: stream topology.png
>
>
> When binding builder with multiple topics, single resultant topic has unordered set of messages.
> This issue is at millisecond level. When messages with same milisecond level are added in topics.
> Scenario :  (1 producer : p1 , 2 topics t1 and t2, streams pick form these 2 topics and save in resulting t3 topic, 4 partitions of t3 and 4 consumers of 4 partitions )
> Case: When p1 adds messages with same millisecond timestamp into t1 and t2 . Stream combine and form t3. When this t3 is consumed by consumer, it has different order of same millisecond messages.



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