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https://issues.apache.org/jira/browse/KAFKA-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099491#comment-16099491
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ASF GitHub Bot commented on KAFKA-4218:
---------------------------------------
GitHub user jeyhunkarimov opened a pull request:
https://github.com/apache/kafka/pull/3570
KAFKA-4218: KIP-149, Enabling withKey interfaces in streams
This PR aims to provide key access to ValueMapper, ValueJoiner,
ValueTransformer, Initializer and Reducer interfaces. More details can be found
in
[here](https://cwiki.apache.org/confluence/display/KAFKA/KIP-149%3A+Enabling+key+access+in+ValueTransformer%2C+ValueMapper%2C+and+ValueJoiner)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jeyhunkarimov/kafka KIP-149
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/3570.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 #3570
----
commit a1bbfdca86c53359ef75217ec4aaad06179d967d
Author: Jeyhun Karimov <je.kari...@gmail.com>
Date: 2017-07-21T23:18:05Z
Add withKey methods to KStream, KGroupedStream, KTable and KGroupedTable
interfaces
----
> Enable access to key in ValueTransformer
> ----------------------------------------
>
> Key: KAFKA-4218
> URL: https://issues.apache.org/jira/browse/KAFKA-4218
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 0.10.0.1
> Reporter: Elias Levy
> Assignee: Jeyhun Karimov
> Labels: api, kip
> Fix For: 1.0.0
>
>
> While transforming values via {{KStream.transformValues}} and
> {{ValueTransformer}}, the key associated with the value may be needed, even
> if it is not changed. For instance, it may be used to access stores.
> As of now, the key is not available within these methods and interfaces,
> leading to the use of {{KStream.transform}} and {{Transformer}}, and the
> unnecessary creation of new {{KeyValue}} objects.
> KIP-149:
> https://cwiki.apache.org/confluence/display/KAFKA/KIP-149%3A+Enabling+key+access+in+ValueTransformer%2C+ValueMapper%2C+and+ValueJoiner
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