Jason Gustafson created KAFKA-14050: ---------------------------------------
Summary: Older clients cannot deserialize ApiVersions response with finalized feature epoch Key: KAFKA-14050 URL: https://issues.apache.org/jira/browse/KAFKA-14050 Project: Kafka Issue Type: Bug Reporter: Jason Gustafson Fix For: 3.3.0 When testing kraft locally, we encountered this exception from an older client: {code:java} [ERROR] 2022-07-05 16:45:01,165 [kafka-admin-client-thread | adminclient-1394] org.apache.kafka.common.utils.KafkaThread lambda$configureThread$0 - Uncaught exception in thread 'kafka-admin-client-thread | admi nclient-1394': org.apache.kafka.common.protocol.types.SchemaException: Error reading field 'api_keys': Error reading array of size 1207959552, only 579 bytes available at org.apache.kafka.common.protocol.types.Schema.read(Schema.java:118) at org.apache.kafka.common.protocol.ApiKeys.parseResponse(ApiKeys.java:378) at org.apache.kafka.common.protocol.ApiKeys$1.parseResponse(ApiKeys.java:187) at org.apache.kafka.clients.NetworkClient$DefaultClientInterceptor.parseResponse(NetworkClient.java:1333) at org.apache.kafka.clients.NetworkClient.parseStructMaybeUpdateThrottleTimeMetrics(NetworkClient.java:752) at org.apache.kafka.clients.NetworkClient.handleCompletedReceives(NetworkClient.java:888) at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:577) at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.processRequests(KafkaAdminClient.java:1329) at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.run(KafkaAdminClient.java:1260) at java.base/java.lang.Thread.run(Thread.java:832) {code} The cause appears to be from a change to the type of the `FinalizedFeaturesEpoch` field in the `ApiVersions` response from int32 to int64: [https://github.com/confluentinc/ce-kafka/commit/fb4f297207ef62f71e4a6d2d0dac75752933043d#diff-32006e8becae918416debdb9ac76bf8a1ad12b83aaaf5f8819b6ecc00c1fb56bL58.] Fortunately, `FinalizedFeaturesEpoch` is a tagged field, so we can fix this by creating a new field. We will have to leave the existing tag in the protocol spec and consider it dead. Credit for this find goes to [~dajac] . -- This message was sent by Atlassian Jira (v8.20.10#820010)