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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (KAFKA-3794) Add Stream / Table prefix in print functions
Date Wed, 06 Jul 2016 17:47:11 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-3794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Guozhang Wang resolved KAFKA-3794.
       Resolution: Fixed
    Fix Version/s:

Issue resolved by pull request 1577

> Add Stream / Table prefix in print functions
> --------------------------------------------
>                 Key: KAFKA-3794
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3794
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Guozhang Wang
>            Assignee: Bill Bejeck
>              Labels: newbie, user-experience
>             Fix For:
> Currently the KTable/KStream.print() operator will print the key-value pair as it was
forwarded to this operator. However, if there are multiple operators in the topologies with
the same {{PrintStream}} (e.g. stdout), their printed key-value pairs will be interleaving
on that stream channel.
> Hence it is better to add a prefix for different KStream/KTable.print operators. One
> 1) For KTable, it inherits a table name when created, and we can use that name as the
prefix as {{[table-name]: key, value}}.
> 2) For KStream, we can overload the function with an additional "name" parameter that
we use as the prefix; if it is not specified, then we can use the parent processor node name,
which has the pattern like {{KSTREAM-JOIN-suffix_index}}.

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