Abhishek Radhakrishnan c324e37751
Add javadocs to KafkaEmitterTest & fix flaky test (#15898)
* Address review comment: add test javadocs

* Fix flaky assertion failure.

Use ConcurrentHashMap instead of HashMap because the producer callback
can trigger concurrently and override the map initialization.

* fixup intellij inspection
2024-02-14 11:52:06 -08:00
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