Steven Schlansker created KAFKA-4726:
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Summary: ValueMapper should have (read) access to key
Key: KAFKA-4726
URL: https://issues.apache.org/jira/browse/KAFKA-4726
Project: Kafka
Issue Type: Improvement
Components: streams
Affects Versions: 0.10.1.1
Reporter: Steven Schlansker
{{ValueMapper}} should have read-only access to the key for the value it is
mapping. Sometimes the value transformation will depend on the key.
It is possible to do this with a full blown {{KeyValueMapper}} but that loses
the promise that you won't change the key -- so you might introduce a re-keying
phase that is totally unnecessary.
[ If mapValues() is guaranteed to be no less efficient than map() the issue may
be moot, but I presume there are some optimizations that are valid with the
former but not latter. ]
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