Randall Hauch created KAFKA-6279:
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Summary: 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
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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