[Issue #45] [pulsar-client-kafka-compat] Handled Kafka record headers…

[swamymavuri]

(If this PR fixes a github issue, please add Fixes #<xyz>.)

Fixes #45

(or if this PR is one task of a github issue, please add Master Issue: #<xyz> to link to the master issue.)

Master Issue: #

Motivation

Kafka Record Headers are not being handled with compat library

Explain here the context, and why you're making that change. What is the problem you're trying to solve.

Modifications

Describe the modifications you've done.
Retreived header variables from the record headers and update it to messagebuilder in producer.
Retreived messsage properties and update it to consumer record

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:
Added PulsarKafkaConsumerTest to cover PulsarKafkaConsumer code flow
(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API: (yes / no)
• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)
• The rest endpoints: (yes / no)
• The admin cli options: (yes / no)
• Anything that affects deployment: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[lhotari]

Is this import used at all?

[swamymavuri]

yes, while encoding the kafka record headers

[cbornet]

I don't understand what this test does. There are no assertions, no messages, no headers verification, ...

[swamymavuri]

Added assertion statements for Header Verification

[swamymavuri]

@cbornet , Can you please take a look at this PR and let me know if i need to add any

[lhotari]

It would be useful to have an integration test. There are existing integrations tests in https://github.com/apache/pulsar-adapters/blob/master/tests/pulsar-kafka-compat-client-test/src/test/java/org/apache/pulsar/tests/integration/compat/kafka/ . Please add one for validation the correct behavior. You could add test methods to the existing KafkaApiTest, for example.