[jira] [Resolved] (KAFKA-6277) Make loadClass thread-safe for class loaders of Connect plugins

["Ewen Cheslack-Postava (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ewen Cheslack-Postava resolved KAFKA-6277.
------------------------------------------
       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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