[FLINK-15490][kafka][test-stability] Enable idempotence producing in …

[becketqin]

…KafkaITCase to avoid intermittent test failure.

What is the purpose of the change

Kafka IT case produces messages without enabling idempotence for KafkaProducer. This may cause occasional failure in some tests with duplication check. This patch enables idempotent Kafka producer.

Brief change log

Enable idempotent Kafka producer in KafkaITCase.

Verifying this change

This change fixes an existing test case, i.e. KafkaITCase.

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: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (no)
• 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? (no)
• If yes, how is the feature documented? (not applicable)

[becketqin]

@pnowojski Will you have time to take a quick look? Thanks.

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Automated Checks

Last check on commit df73f50 (Wed Jan 08 06:10:23 UTC 2020)

Warnings:

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• ❓ 1. The [description] looks good.
• ❓ 2. There is [consensus] that the contribution should go into to Flink.
• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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CI report:

• df73f50 Travis: SUCCESS Azure: SUCCESS

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[becketqin]

@flinkbot run travis

[becketqin]

Merged.
master: f0f9343
release-1.10: a1ba3f9