The file is in LevelDB format by default: https://code.google.com/p/leveldb/
The MapReduce code contains support for reading and writing it, so that it
can be passed between one pipeline and another.
If you want to control the file format yourself I would recommend using the
Appengine GCS client: https://code.google.com/p/appengine-gcs-client/
On Wed, Mar 27, 2013 at 6:25 AM, Ranjit Chacko <rjcha...@gmail.com> wrote:
> I'm trying to create JSON representations of my models in the datastore
> and then write them to a file in Cloud Storage in a MapperPipeline.
>
> The map method looks something like this:
>
> def map_method(entity):
> json_message = make_json_message(entity)
> yield(json_message)
>
>
> and the params for the output_writer look something like this:
>
> "output_writer":{
> "filesystem": "gs",
> "gs_bucket_name": "json_export",
> "mime_type": "text/utf-8"
> }
>
> The pipeline completes successfully, but the file I'm getting in Cloud
> Storage seems to be in a binary format.
>
> How do I get a JSON file out that I can read?
>
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