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https://issues.apache.org/jira/browse/FLINK-8354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593020#comment-16593020
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ASF GitHub Bot commented on FLINK-8354:
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alexeyt820 opened a new pull request #6615: [FLINK-8354] [flink-connectors] Add
ability to access and provider Kafka headers
URL: https://github.com/apache/flink/pull/6615
## What is the purpose of the change
This changes allows to access Kafka headers in KeyedDeserializationSchema,
and to provide Kafka headers via KeyedSerializationSchema.headers method
## Brief change log
- Add default _headers_ method to KeyedSerializationSchema interface
- Add default deserialize method with _headers_ argument to
KeyedDeserializationSchema
- Add Kafka011Fetcher to get headers from Kafka ConsumerRecord and provide
them as parameter KeyedDeserializationSchema
- Modify FlinkKafkaProducer011 to request _headers_ from
KeyedSerializationSchema and add them to ProducerRecord.
## Verifying this change
This change added tests and can be verified as follows:
- *Added integration test *Kafka011ITCase.testHeaders* to verify that we
can produce headers and consume them
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (yes)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (yes)
- If yes, how is the feature documented? (JavaDocs)
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> Flink Kafka connector ignores Kafka message headers
> -----------------------------------------------------
>
> Key: FLINK-8354
> URL: https://issues.apache.org/jira/browse/FLINK-8354
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector
> Environment: Kafka 0.11.0.0
> Flink 1.4.0
> flink-connector-kafka-0.11_2.11
> Reporter: Mohammad Abareghi
> Assignee: Aegeaner
> Priority: Major
> Labels: pull-request-available
>
> Kafka has introduced notion of Header for messages in version 0.11.0.0
> https://issues.apache.org/jira/browse/KAFKA-4208.
> But flink-connector-kafka-0.11_2.11 which supports kafka 0.11.0.0 ignores
> headers when consuming kafka messages.
> It would be useful in some scenarios, such as distributed log tracing, to
> support message headers to FlinkKafkaConsumer011 and FlinkKafkaProducer011.
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