Your schema says that metadata is a map that has values of a few
different types, but it does not list a map type as one of them.
On Mon, Mar 27, 2017 at 6:11 AM, Dag Stockstad <d...@intercom.io> wrote:
> Hi Avro aficionados,
>
> I'm having trouble serializing a record with a nested map structure i.e. a
> map within a map. The record I'm trying to send has the following structure:
> {
> "event_type": "some_type",
> "data": {
> "id": "2f720f90-ea06-4248-a72e-01eea44981ed",
> "metadata": {
> "some_attr": "some_value",
> "some_map_with_unpredictable_name": {
> "some_attr": "some_value"
> }
> }
> }
> }
>
> And the schema is this:
> {
> "namespace": "org.example.event.avro",
> "type": "record",
> "name": "EventNotification",
> "fields": [{
> "name": "event_type",
> "type": "string"
> }, {
> "name": "data",
> "type": {
> "type": "record",
> "name": "EventData",
> "fields": [{
> "name": "id",
> "type": "string"
> }, {
> "name": "metadata",
> "type": {
> "type": "map",
> "values": [
> "int",
> "float",
> "string",
> "boolean",
> "long",
> "null"
> ]
> }
> }]
> }
> }]
> }
>
> The nested map (some_map_with_unpredictable_name) is causing problems
> (serialization error). Is there any way I can have another map as a value in
> the metadata map?
>
> Due to the nature of the system, I cannot 100% predict the structure of the
> metadata field. Can Avro accomodate these requirements or do I have to fall
> back on something such as JSON for this one?
>
> Help very appreciated (I'm a bit stuck).
>
> Kind regards,
> Dag
>
--
busbey
