yuanlihan opened a new pull request #9573: Fix some flaws of KafkaEmitter URL: https://github.com/apache/druid/pull/9573 ### Description There are some flaws in `KafkaEmitter`: 1. annoying error logs(see [KAFKA-4854](https://issues.apache.org/jira/browse/KAFKA-4854)), like this `2020-03-27T09:53:02,057 ERROR [kafka-producer-network-thread | producer-1] org.apache.kafka.clients.producer.internals.RecordBatch - Error executing user-provided callback on message for topic-partition 'druid_metrics_test-0' java.lang.NullPointerException` 2. the `start` method is called twice by the `LifecycleStart` framework 3. redundant periodic scheduling of send tasks <hr> This PR has: - [x] been self-reviewed. - [x] been tested in a test Druid cluster. <hr> ##### Key changed class in this PR * `KafkaEmitter `
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