[jira] [Created] (KAFKA-9830) DeadLetterQueueReporter leaks KafkaProducer instance

["Greg Harris (Jira)" <ji...@apache.org>]

Greg Harris created KAFKA-9830:
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             Summary: DeadLetterQueueReporter leaks KafkaProducer instance
                 Key: KAFKA-9830
                 URL: https://issues.apache.org/jira/browse/KAFKA-9830
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 2.0.0
            Reporter: Greg Harris


The DeadLetterQueueReporter (introduced by KAFKA-6738) creates a KafkaProducer to report errors to Kafka, but does not clean up the producer, leaving many idle network threads open after tasks are stopped.

Reproduction steps:
Start a task that has a non-empty DLQ topic name
Stop the task
Observe the list of running threads

Expected result:
There is no thread related to the stopped task's DLQ left running

Actual result:
There is a thread named something like kafka-producer-network-thread | connector-dlq-producer-task-0" #1234 left running



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