[jira] [Resolved] (KAFKA-9186) Kafka Connect floods logs with probably bogus error messages from DelegatingClassLoader

["Greg Harris (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-9186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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