Piotr Szczepanik created KAFKA-9186: ---------------------------------------
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? -- This message was sent by Atlassian Jira (v8.3.4#803005)