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https://issues.apache.org/jira/browse/KAFKA-6279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Randall Hauch resolved KAFKA-6279.
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Resolution: Duplicate
> Connect metrics do not get cleaned up for a source connector that doesn't
> stop properly
> ---------------------------------------------------------------------------------------
>
> Key: KAFKA-6279
> URL: https://issues.apache.org/jira/browse/KAFKA-6279
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 1.0.0
> Reporter: Randall Hauch
> Assignee: Randall Hauch
> Priority: Critical
>
> Connect will call {{stop()}} on a source task to signal that it should "_stop
> trying to poll for new data
> and interrupt any outstanding poll() requests_" (see the
> [JavaDoc|http://kafka.apache.org/10/javadoc/org/apache/kafka/connect/source/SourceTask.html#stop--]
> for this method).
> Unfortunately, not all connectors properly adhere to this expectation. Since
> the metrics for the source task are cleaned up only when the worker source
> task's thread completes, a task whose {{poll()}} method blocks forever will
> current prevent its thread from completing. So, we need to change how the
> metrics are cleaned up to ensure this always happens.
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