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GH-423 Add option to use KafkaHeaders.TOPIC Header

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Resolves https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/issues/423

Add an option to override the default binding destination with the value
of the header, if present.
This commit is contained in:
Gary Russell
2019-06-18 16:10:18 -04:00
parent 569344afa6
commit d8df388d9f
4 changed files with 53 additions and 14 deletions
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6
docs/src/main/asciidoc/overview.adoc
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@@ -327,7 +327,11 @@ The replication factor to use when provisioning topics. Overrides the binder-wid
Ignored if `replicas-assignments` is present.
+
Default: none (the binder-wide default of 1 is used).
useTopicHeader::
Set to `true` to override the default binding destination (topic name) with the value of the `KafkaHeaders.TOPIC` message header in the outbound message.
If the header is not present, the default binding destination is used.
Default: `false`.
+
NOTE: The Kafka binder uses the `partitionCount` setting of the producer as a hint to create a topic with the given partition count (in conjunction with the `minPartitionCount`, the maximum of the two being the value being used).
Exercise caution when configuring both `minPartitionCount` for a binder and `partitionCount` for an application, as the larger value is used.