I'm looking at dataflow to try to export data from Datastore to Spanner. Spanner seems to only accept avro files via a dataflow connector. The only dataflow template I can find is from datastore to text-files. And the datastore export service is only exporting into levelDB format. Any clue would be helpful, Thanks!
The solution I ended up with was extracting the data as csv, then converting to Avro with PySpark. And finally inserting with Dataflow into Spanner.