Erik van Oosten created KAFKA-14972: ---------------------------------------
Summary: Make KafkaConsumer usable in async runtimes Key: KAFKA-14972 URL: https://issues.apache.org/jira/browse/KAFKA-14972 Project: Kafka Issue Type: Wish Components: consumer Reporter: Erik van Oosten KafkaConsumer contains a check that rejects nested invocations from different threads (method {{{}acquire{}}}). For users that use an async runtime, this is an almost impossible requirement. Examples of async runtimes that are affected are Kotlin co-routines (see KAFKA-7143) and Zio. We propose to replace the thread-id check with an access-id that is stored on a thread-local variable. Existing programs will not be affected. Developers that work in an async runtime can pick up the access-id and set it on the thread-local variable in a thread of their choosing. Every time a callback is invoked a new access-id is generated. When the callback completes, the previous access-id is restored. This proposal does not make it impossible to use the client incorrectly. However, we think it strikes a good balance between making correct usage from an async runtime possible while making incorrect usage difficult. Alternatives considered: # Configuration that switches off the check completely. -- This message was sent by Atlassian Jira (v8.20.10#820010)