Xavier Léauté created KAFKA-12883:
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Summary: Adress KIP-100 type constraints now that Java 7 support
is dropped
Key: KAFKA-12883
URL: https://issues.apache.org/jira/browse/KAFKA-12883
Project: Kafka
Issue Type: Improvement
Reporter: Xavier Léauté
As part of [KIP-100 rejected
alternatives|https://cwiki.apache.org/confluence/display/KAFKA/KIP-100+-+Relax+Type+constraints+in+Kafka+Streams+API#KIP100RelaxTypeconstraintsinKafkaStreamsAPI-RejectedAlternatives],
we suggested a more correct alternative to the type constraints for some of
the {{KStream}} methods.
Unfortunately at the time, there was a Java 7 compiler behavior that prevented
us from using those type constraints, so we had to relax them in order to
preserve backwards compatibility.
As part of the KIP it was mentioned that:
??Once we drop support for 1.7 we can always decide to switch to approach 2.
without breaking source compatibility, by making a proposal similar to this
KIP.??
Since Java 7 support has been dropped a while ago, it would be a good time to
revisit this and possibly switch to the alternative type constraints. The
change should be source compatible, although the streams APIs have
significantly evolved since, so there might be some additional investigation
required to ensure that is still the case and also covers the Scala Streams
APIs.
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