[jira] [Created] (KAFKA-2756) Replication Broken between Kafka 0.8.2.1 and 0.9 - NetworkClient.java uses wrong protocl version

["Matthew Bruce (JIRA)" <ji...@apache.org>]

Matthew Bruce created KAFKA-2756:
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             Summary: Replication Broken between Kafka 0.8.2.1 and 0.9 - NetworkClient.java uses wrong protocl version
                 Key: KAFKA-2756
                 URL: https://issues.apache.org/jira/browse/KAFKA-2756
             Project: Kafka
          Issue Type: Bug
            Reporter: Matthew Bruce


During a rolling upgrade from 0.8.2.1 to 0.9.0.0, replication between 0.9.0.0 and 0.8.2.1 fails due to
org.apache.kafka.clients.networkClient:handleCompletedReceives always using the latest version of the API Key available instead of the one specified by inter.broker.protocol.version.

This line should not use ProtoUtils.currentResponseSchema and instead call ProtoUtils.ResponseSchema and specify a version explicitly:
{code}
Struct body = (Struct) ProtoUtils.currentResponseSchema(apiKey).read(receive.payload());
{code}

This results in WARN messages like the following in the server.log file as the responses are decoded with the wrong Schema:
{code}
[2015-11-05 19:13:10,309] WARN [ReplicaFetcherThread-0-182050600], Error in fetch kafka.server.ReplicaFetcherThread$FetchRequest@6cc18858. Possible cause: org.apache.kafka.common.protocol.types.SchemaException: Error reading field 'responses': Error reading field 'topic': java.nio.BufferUnderflowException (kafka.server.ReplicaFetcherThread)
{code}
{code}
[2015-11-03 16:55:15,178] WARN [ReplicaFetcherThread-1-182050600], Error in fetch kafka.server.ReplicaFetcherThread$FetchRequest@224388b2. Possible cause: org.apache.kafka.common.protocol.types.SchemaException: Error reading field 'responses': Error reading field 'partition_responses': Error reading field 'record_set': java.lang.IllegalArgumentException (kafka.server.ReplicaFetcherThread)
{code}





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