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https://issues.apache.org/jira/browse/KAFKA-9186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Greg Harris resolved KAFKA-9186.
--------------------------------
Reviewer: Jason Gustafson
Assignee: Chia-Ping Tsai
Resolution: Fixed
> 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
> Assignee: Chia-Ping Tsai
> Priority: Minor
> Fix For: 3.0.0, 2.5.0
>
>
> 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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