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https://issues.apache.org/jira/browse/AVRO-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752811#comment-13752811
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Doug Cutting commented on AVRO-1367:
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It might be useful to have a parser mode or version that works regardless of
dependency order. Since schemas in data files, rpc handshakes, etc. must be
self-contained, they are probably most safely parsed by a parser that does not
permit forward or external references. So an extension that permits forward
references should be optional.
As for reasons not to add optional support for forward references, I reference
Wikipedia:
"Permitting forward references can greatly increase the complexity and memory
requirements of a compiler, and generally prevents the compiler from being
implemented in one pass."
http://en.wikipedia.org/wiki/Forward_declaration#Forward_reference
> Compiling multiple schemas in a directory fails if dependencies are not in
> alphabetical order
> ---------------------------------------------------------------------------------------------
>
> Key: AVRO-1367
> URL: https://issues.apache.org/jira/browse/AVRO-1367
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.7.6
> Reporter: Duane Moore
> Attachments: avro-multiple-schema-directory-failure.diff
>
>
> When compiling a schema with multiple input files, no dependencies can be
> found unless they are located in a file name that precedes the current file
> being parsed alphabetically. I added two sample test cases to illustrate
> this using the existing player.avsc and position.avsc in the test folder.
> Simply calling the doCompile using the input directory versus specifying the
> files manually, or specifying the input files by name, but in alphabetical
> order, results in an error:
> org.apache.avro.SchemaParseException: Undefined name: "Position"
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