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https://issues.apache.org/jira/browse/KAFKA-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16284488#comment-16284488
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ASF GitHub Bot commented on KAFKA-4218:
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GitHub user jeyhunkarimov opened a pull request:
https://github.com/apache/kafka/pull/4309
KAFKA-4218: Enable access to key in ValueTransformer and ValueMapper
This PR is the partial implementation for KIP-149. As the discussion for
this KIP is still ongoing, I made a PR on the "safe" portions of the KIP (so
that it can be included in the next release) which are 1) `ValueMapperWithKey`,
2) `ValueTransformerWithKeySupplier`, and 3) `ValueTransformerWithKey`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jeyhunkarimov/kafka KIP-149_hope_last
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/4309.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 #4309
----
commit 91c1108c72f2f3b3097dcff3bd2aad237789215e
Author: Jeyhun Karimov <[email protected]>
Date: 2017-12-09T00:56:36Z
Submit the first version of KIP-149
----
> 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: 1.1.0
>
>
> 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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