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From "Bill Graham (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-872) Allow interdependancies across IDL schema imports
Date Wed, 10 Aug 2011 23:20:28 GMT

    [ https://issues.apache.org/jira/browse/AVRO-872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082750#comment-13082750
] 

Bill Graham commented on AVRO-872:
----------------------------------

We'd like to continue to use avsc files because they're easier to read and author and our
developers are already familiar with them. They're also not experimental and changing like
the IDL language. So we'd just use IDL as a mechanism to combine fragmented avsc files, like
the initial problem statement:

{noformat}
@namespace("avro.examples.baseball")
protocol Baseball {
   import schema "position.avsc";
   import schema "player.avsc";
}
{noformat}

> Allow interdependancies across IDL schema imports
> -------------------------------------------------
>
>                 Key: AVRO-872
>                 URL: https://issues.apache.org/jira/browse/AVRO-872
>             Project: Avro
>          Issue Type: Improvement
>            Reporter: Bill Graham
>            Assignee: Doug Cutting
>         Attachments: AVRO-872.patch, AVRO-872.patch, AVRO-872.patch, AVRO-872_4.patch
>
>
> This currently doesn't work because Player depends on Position, but it should:
> {noformat}
> $ cat position.avsc 
> {"type":"enum", "name": "Position", "namespace": "avro.examples.baseball",
>     "symbols": ["P", "C", "B1", "B2", "B3", "SS", "LF", "CF", "RF", "DH"]
> }
> $ cat player.avsc 
> {"type":"record", "name":"Player", "namespace": "avro.examples.baseball",
>   "fields": [
>    {"name": "number", "type": "int"},
>    {"name": "first_name", "type": "string"},
>    {"name": "last_name", "type": "string"},
>    {"name": "position", "type": {"type": "array", "items": "avro.examples.baseball.Position"}
}
>   ]
> }
> $ cat baseball.avdl 
> @namespace("avro.examples.baseball")
> protocol Baseball {
>    import schema "position.avsc";
>    import schema "player.avsc";
> }
> $ java -jar avro-tools-1.5.1.jar idl baseball.avdl baseball.avpr
> {noformat}

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