KIP-146 — Classloading Isolation in Connect

Accepted Kafka 1.0 Connect

KIP-146 introduces classloader isolation for Kafka Connect plugins (connectors, transformations, converters), giving each plugin its own isolated `ClassLoader` so conflicting library versions between plugins or between a plugin and the Connect framework do not interfere. Without isolation, loading multiple connectors with conflicting transitive dependencies into the same JVM causes `ClassCastException` or incorrect behavior that is hard to diagnose.

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