[jira] [Updated] (KAFKA-4481) Relax Kafka Streams API type constraints
[
https://issues.apache.org/jira/browse/KAFKA-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Guozhang Wang updated KAFKA-4481:
-
Resolution: Fixed
Status: Resolved (was: Patch Available)
Issue resolved by pull request 2205
[https://github.com/apache/kafka/pull/2205]
> Relax Kafka Streams API type constraints
>
>
> Key: KAFKA-4481
> URL: https://issues.apache.org/jira/browse/KAFKA-4481
> Project: Kafka
> Issue Type: Bug
> Components: streams
>Reporter: Xavier Léauté
>Assignee: Xavier Léauté
> Labels: kip, usability
> Fix For: 0.10.2.0
>
>
> Streams API methods that apply transformations to streams are currently
> invariant in the key and value types, when they should probably be
> contravariant in those types.
> For instance, {{KStream.filter(Predicate predicate)}} should be
> {{KStream.filter(Predicate predicate)}} to accept
> predicates that can act on any supertype of K, or V.
> Same thing applies to method that take {{Aggregator}}, {{StreamPartitioner}},
> {{KeyValueMapper}}, {{ValueMapper}}, {{ProcessorSupplier}}, {{ValueJoiner}},
> etc.
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[jira] [Updated] (KAFKA-4481) Relax Kafka Streams API type constraints
[
https://issues.apache.org/jira/browse/KAFKA-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ewen Cheslack-Postava updated KAFKA-4481:
-
Reviewer: Guozhang Wang
> Relax Kafka Streams API type constraints
>
>
> Key: KAFKA-4481
> URL: https://issues.apache.org/jira/browse/KAFKA-4481
> Project: Kafka
> Issue Type: Bug
> Components: streams
>Reporter: Xavier Léauté
>Assignee: Xavier Léauté
> Labels: kip, usability
> Fix For: 0.10.2.0
>
>
> Streams API methods that apply transformations to streams are currently
> invariant in the key and value types, when they should probably be
> contravariant in those types.
> For instance, {{KStream.filter(Predicate predicate)}} should be
> {{KStream.filter(Predicate predicate)}} to accept
> predicates that can act on any supertype of K, or V.
> Same thing applies to method that take {{Aggregator}}, {{StreamPartitioner}},
> {{KeyValueMapper}}, {{ValueMapper}}, {{ProcessorSupplier}}, {{ValueJoiner}},
> etc.
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[jira] [Updated] (KAFKA-4481) Relax Kafka Streams API type constraints
[
https://issues.apache.org/jira/browse/KAFKA-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ewen Cheslack-Postava updated KAFKA-4481:
-
Labels: kip usability (was: usability)
> Relax Kafka Streams API type constraints
>
>
> Key: KAFKA-4481
> URL: https://issues.apache.org/jira/browse/KAFKA-4481
> Project: Kafka
> Issue Type: Bug
> Components: streams
>Reporter: Xavier Léauté
>Assignee: Xavier Léauté
> Labels: kip, usability
> Fix For: 0.10.2.0
>
>
> Streams API methods that apply transformations to streams are currently
> invariant in the key and value types, when they should probably be
> contravariant in those types.
> For instance, {{KStream.filter(Predicate predicate)}} should be
> {{KStream.filter(Predicate predicate)}} to accept
> predicates that can act on any supertype of K, or V.
> Same thing applies to method that take {{Aggregator}}, {{StreamPartitioner}},
> {{KeyValueMapper}}, {{ValueMapper}}, {{ProcessorSupplier}}, {{ValueJoiner}},
> etc.
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[jira] [Updated] (KAFKA-4481) Relax Kafka Streams API type constraints
[
https://issues.apache.org/jira/browse/KAFKA-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ewen Cheslack-Postava updated KAFKA-4481:
-
Fix Version/s: 0.10.2.0
> Relax Kafka Streams API type constraints
>
>
> Key: KAFKA-4481
> URL: https://issues.apache.org/jira/browse/KAFKA-4481
> Project: Kafka
> Issue Type: Bug
> Components: streams
>Reporter: Xavier Léauté
>Assignee: Xavier Léauté
> Labels: kip, usability
> Fix For: 0.10.2.0
>
>
> Streams API methods that apply transformations to streams are currently
> invariant in the key and value types, when they should probably be
> contravariant in those types.
> For instance, {{KStream.filter(Predicate predicate)}} should be
> {{KStream.filter(Predicate predicate)}} to accept
> predicates that can act on any supertype of K, or V.
> Same thing applies to method that take {{Aggregator}}, {{StreamPartitioner}},
> {{KeyValueMapper}}, {{ValueMapper}}, {{ProcessorSupplier}}, {{ValueJoiner}},
> etc.
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[jira] [Updated] (KAFKA-4481) Relax Kafka Streams API type constraints
[
https://issues.apache.org/jira/browse/KAFKA-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xavier Léauté updated KAFKA-4481:
-
Status: Patch Available (was: In Progress)
> Relax Kafka Streams API type constraints
>
>
> Key: KAFKA-4481
> URL: https://issues.apache.org/jira/browse/KAFKA-4481
> Project: Kafka
> Issue Type: Bug
> Components: streams
>Reporter: Xavier Léauté
>Assignee: Xavier Léauté
> Labels: usability
>
> Streams API methods that apply transformations to streams are currently
> invariant in the key and value types, when they should probably be
> contravariant in those types.
> For instance, {{KStream.filter(Predicate predicate)}} should be
> {{KStream.filter(Predicate predicate)}} to accept
> predicates that can act on any supertype of K, or V.
> Same thing applies to method that take {{Aggregator}}, {{StreamPartitioner}},
> {{KeyValueMapper}}, {{ValueMapper}}, {{ProcessorSupplier}}, {{ValueJoiner}},
> etc.
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[jira] [Updated] (KAFKA-4481) Relax Kafka Streams API type constraints
[
https://issues.apache.org/jira/browse/KAFKA-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xavier Léauté updated KAFKA-4481:
-
Description:
Streams API methods that apply transformations to streams are currently
invariant in the key and value types, when they should probably be
contravariant in those types.
For instance, {{KStream.filter(Predicate predicate)}} should be
{{KStream.filter(Predicate predicate)}} to accept
predicates that can act on any supertype of K, or V.
Same thing applies to method that take {{Aggregator}}, {{StreamPartitioner}},
{{KeyValueMapper}}, {{ValueMapper}}, {{ProcessorSupplier}}, {{ValueJoiner}},
etc.
was:
Streams API methods that apply transformations to streams are currently
invariant in the key and value types, when they should probably be
contravariant in those types.
For instance, {{KStream.filter(Predicate predicate)}} should be
{{KStream.filter(Predicate predicate)}} to accept
predicates that can act on any supertype of K, or V.
Same thing applies to method that take {{Aggregator}}s, {{StreamPartitioner}}s,
{{KeyValueMapper}}s, {{ValueMapper}}s, {{ProcessorSupplier}}s,
{{ValueJoiner}}s, etc.
> Relax Kafka Streams API type constraints
>
>
> Key: KAFKA-4481
> URL: https://issues.apache.org/jira/browse/KAFKA-4481
> Project: Kafka
> Issue Type: Improvement
> Components: streams
>Reporter: Xavier Léauté
>Assignee: Xavier Léauté
> Labels: usability
>
> Streams API methods that apply transformations to streams are currently
> invariant in the key and value types, when they should probably be
> contravariant in those types.
> For instance, {{KStream.filter(Predicate predicate)}} should be
> {{KStream.filter(Predicate predicate)}} to accept
> predicates that can act on any supertype of K, or V.
> Same thing applies to method that take {{Aggregator}}, {{StreamPartitioner}},
> {{KeyValueMapper}}, {{ValueMapper}}, {{ProcessorSupplier}}, {{ValueJoiner}},
> etc.
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