[jira] [Created] (KAFKA-14050) Older clients cannot deserialize ApiVersions response with finalized feature epoch

["Jason Gustafson (Jira)" <ji...@apache.org>]

Jason Gustafson created KAFKA-14050:
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             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] .



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