Konstantine Karantasis created KAFKA-6277:
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Summary: 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: 0.11.0.2, 1.0.0
Reporter: Konstantine Karantasis
Assignee: Konstantine Karantasis
Fix For: 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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