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https://issues.apache.org/jira/browse/AVRO-1340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568443#comment-15568443
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Zoltan Ivanfi commented on AVRO-1340:
-------------------------------------

I like the mechanism suggested by Matthieu, but I think declaring it as 
"aliases" is very misleading. Although creating an alias is one possible use 
case for this mechanism, specifying a fallback is a more typical one. Maybe 
name them fallback values instead?

> use default to allow old readers to specify default enum value when 
> encountering new enum symbols
> -------------------------------------------------------------------------------------------------
>
>                 Key: AVRO-1340
>                 URL: https://issues.apache.org/jira/browse/AVRO-1340
>             Project: Avro
>          Issue Type: Improvement
>          Components: spec
>         Environment: N/A
>            Reporter: Jim Donofrio
>            Priority: Minor
>
> The schema resolution page says:
> > if both are enums:
> > if the writer's symbol is not present in the reader's enum, then an
> error is signalled.
> This makes it difficult to use enum's because you can never add a enum value 
> and keep old reader's compatible. Why not use the default option to refer to 
> one of enum values so that when a old reader encounters a enum ordinal it 
> does not recognize, it can default to the optional schema provided one. If 
> the old schema does not provide a default then the older reader can continue 
> to fail as it does today.



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