[FLINK-18886][python] Support Kafka connectors for Python DataStream …

[shuiqiangchen]

What is the purpose of the change

Add Kafka connectors for Python DataStream API, supported versions are 0.10.x, 0.11.x and universal.

Brief change log

• Added FlinkKafkaConsumer010, FlinkKafkaConsumer011 and FlinkKafkaConsuer
• Added FlinkKafkaProducer010, FlinkKafkaProducer011 and FlinkKafkaProducer

Verifying this change

This pull request has test cases covered by FlinkKafkaTest in test_connectors.py

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): ( no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? ( not documented)

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Automated Checks

Last check on commit 5195ef9 (Sun Aug 16 06:45:50 UTC 2020)

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CI report:

• ac58820 Azure: SUCCESS

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[hequn8128]

@shuiqiangchen Thanks a lot for the PR. The code looks good overall and the test part looks very good. Left some minor comments below.

[shuiqiangchen]

@hequn8128 Thank you for your comments, I have updated the pr according to your suggestions, please have a look at it.

[hequn8128]

@shuiqiangchen Thanks a lot for the update. With some minor comments below.

[hequn8128]

Add kafka_producer_pool_size to the constructor so that the API of FlinkKafkaProducer011 is consistent with FlinkKafkaProducer

[hequn8128]

LGTM