document protocol system error
------------------------------

                 Key: AVRO-447
                 URL: https://issues.apache.org/jira/browse/AVRO-447
             Project: Avro
          Issue Type: Bug
          Components: spec
    Affects Versions: 1.3.0
            Reporter: Doug Cutting


Currently Java internally adds a type at the start of each protocol message's 
error list for system errors.  This is used when an exception is encountered on 
the server while executing an RPC that does not match one of the messages 
declared errors.  The type is "string", so it will never conflict with another 
error, since all other errors are defined as records.

For example, if a protocol has a message like:

{code}
"foo": {
  "request": [],
  "response": "null",
  "errors": ["MyError"]
}
{code}

Then errors are written and read with the schema ["string", "MyError"], 
although that schema never appears publicly.

This should either be documented or changed.

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