[jira] [Commented] (KAFKA-3121) KStream DSL API Improvement

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-3121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15109381#comment-15109381 ] 

ASF GitHub Bot commented on KAFKA-3121:
---------------------------------------

GitHub user guozhangwang opened a pull request:

    https://github.com/apache/kafka/pull/795

    KAFKA-3121: Remove aggregatorSupplier and add Reduce functions

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/guozhangwang/kafka K3121s1

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/kafka/pull/795.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #795
    
----
commit 10837b24c7a8af0e2843a8ae2102610dc28aff3c
Author: Guozhang Wang <wa...@gmail.com>
Date:   2016-01-20T02:48:07Z

    refactor aggregate and add reduce

commit c8fe67f78809276b2c9aa3ca4f36d64b79483c1a
Author: Guozhang Wang <wa...@gmail.com>
Date:   2016-01-20T06:48:19Z

    add new files

commit ad90555eee8ce7de799a258c175522a95cafb372
Author: Guozhang Wang <wa...@gmail.com>
Date:   2016-01-20T20:52:24Z

    KAFKA-3121: Remove AggregateSupplier for aggregate and add reduce functions

----


> KStream DSL API Improvement
> ---------------------------
>
>                 Key: KAFKA-3121
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3121
>             Project: Kafka
>          Issue Type: Sub-task
>            Reporter: Guozhang Wang
>            Assignee: Guozhang Wang
>
> From some collected feedbacks, here is a list of potential improvements that we want to make:
> 1. Remove AggregateSupplier for aggregate, and provide more built-in aggregations.
> 2. Join to return KeyValue<>.
> 3. "Windows" class syntax-sugers.
> 4. Add print() to KTable / KStream.
> 5. flatMap / flatMapValues to return arrays in addition to Iterable.
> 6. make the API function names aligned with Java 8+, e.g. filterOut -> filterNot
> 7. collapse process() and transform() in KStream.
> 8. validate Streaming configs and allow passing properties to KafkaStreaming.
> 9. Rename KafkaStreaming to Streams.
> Also move some of the state package into internals, and create a new top-level common folder with KeyValue / etc in it.



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