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https://issues.apache.org/jira/browse/AVRO-530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861935#action_12861935
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Scott Carey commented on AVRO-530:
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Some of it was in this conversation:
http://www.mail-archive.com/avro-dev@hadoop.apache.org/msg02397.html

I agree the JSON could certainly be easier to use in several ways.   But those 
are spec changes that are not backwards compatible.  Maybe Avro 2.0?

> allow for mutual recursion in type definitions
> ----------------------------------------------
>
>                 Key: AVRO-530
>                 URL: https://issues.apache.org/jira/browse/AVRO-530
>             Project: Avro
>          Issue Type: Improvement
>          Components: spec
>    Affects Versions: 1.3.2
>            Reporter: Jeff Hodges
>
> Suppose you have these two types in your protocol:
> {code}
> {"name": "User", "type": "record", "fields": [{"name": "current_status", 
> "type": "Status"}]}
> {"name": "Status", "type": "record", "fields": [{"name": "author", "type": 
> "User"}]}
> {code}
> This will raise an error! The current workaround is to define one of them at 
> their first usage. Like:
> {code}
> {"name": "User", "type": "record", "fields": [{"name": "current_status", 
> "type": {"name": "Status", "type": "record", "fields": [.. lots of fields 
> ...]}]}
> {code}
> But this is incredibly unwieldy. It would be really nice for the spec to 
> require all the parsers to allow for mutual recursion, instead. It could be 
> done by implementing a two-pass parser. One pass to acquire names referenced, 
> and a second to fill in those names with their appropriate references.

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