Can you append data to an existing Avro data file?

Question

It seems like there isn't any way to append data to an existing Avro serialized file. I'd like to have multiple processes writing to a single avro file, but it looks like each time I open it, I start over from scratch. I don't want to read in all the data and then write it back out again.

Using the ruby example code I have tried "ab" and "ab+" as various settings, but no joy.

file = File.open('data.avr', 'wb')
schema = Avro::Schema.parse(SCHEMA)
writer = Avro::IO::DatumWriter.new(schema)
dw = Avro::DataFile::Writer.new(file, writer, schema)
dw << {"username" => "john", "age" => 25, "verified" => true}
dw << {"username" => "ryan", "age" => 23, "verified" => false}
dw.close

Answer 1

don't pass the schema to append to the file

Answer 2

I did figure out how to do it in Java using the appendTo method:

DatumWriter writer = new ReflectDatumWriter(Record.class);
DataFileWriter file = new DataFileWriter(writer);
file.setMeta("version", 1);
file.setMeta("creator", "ThinkBigAnalytics");
file.setCodec(CodecFactory.deflateCodec(5));
//file.create(schema, new File("/tmp/records"));
file.appendTo(new File("/tmp/records"));

However, I'd love to do it from Ruby.