Piotr Szczepanik created KAFKA-9186:
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Summary: Kafka Connect floods logs with probably bogus error
messages from DelegatingClassLoader
Key: KAFKA-9186
URL: https://issues.apache.org/jira/browse/KAFKA-9186
Project: Kafka
Issue Type: Bug
Components: KafkaConnect
Affects Versions: 2.3.1
Reporter: Piotr Szczepanik
After upgrading Kafka Connect from 2.3.0 to 2.3.1 we discovered a lot of
recurring ERROR messages in Connect's logs.
{noformat}
Plugin class loader for connector:
'com.google.pubsub.kafka.sink.CloudPubSubSinkConnector' was not found.
Returning:
org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader@58f437b0
logger: org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader
{noformat}
Kafka Connect continues processing the topics as it should be.
We are not using plugin classloader isolation feature by not specifying
plugin.path property because we were seeing classloading deadlocks similar to
ones described in [KAFKA-7421|https://issues.apache.org/jira/browse/KAFKA-7421]
Maybe the level of this message should be lowered?
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