Major Description
AVRO-1340 use default to allow old readers to specify default enum value when encountering new enum symbols - ASF JIRA (apache.org) describes a useful change made a few years ago in Avro, such that enums could be expanded (an additional value(s) added) without breaking compatibility - old consumers would simply default to the default value for that enum.
Unfortunately, in C++, it appears this logic is not implemented and the consumer cannot process messages containing new enum values until it is updated.
I have: Reviewed issues related to enums, reviewied mailing list emails related to "enum" and not found any prior discussion of this issue