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https://issues.apache.org/jira/browse/KAFKA-6277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ewen Cheslack-Postava resolved KAFKA-6277.
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Resolution: Fixed
Fix Version/s: 1.1.0
Issue resolved by pull request 4428
[https://github.com/apache/kafka/pull/4428]
> Make loadClass thread-safe for class loaders of Connect plugins
> ---------------------------------------------------------------
>
> Key: KAFKA-6277
> URL: https://issues.apache.org/jira/browse/KAFKA-6277
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 1.0.0, 0.11.0.2
> Reporter: Konstantine Karantasis
> Assignee: Konstantine Karantasis
> Priority: Blocker
> Fix For: 1.1.0, 1.0.1, 0.11.0.3
>
>
> In Connect's classloading isolation framework, {{PluginClassLoader}} class
> encounters a race condition when several threads corresponding to tasks using
> a specific plugin (e.g. a Connector) try to load the same class at the same
> time on a single JVM.
> The race condition is related to calls to method {{defineClass}} which,
> contract to {{findClass}}, is not thread safe for classloaders that override
> {{loadClass}}. More details here:
> https://docs.oracle.com/javase/7/docs/technotes/guides/lang/cl-mt.html
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