ByteArrayRef bytes = new ByteArrayRef();
bytes.setData("row cq1:value1,cq2:value2".getBytes());
struct.init(bytes, 0, bytes.getData().length);
// Serialize the struct into a mutation
Mutation m = serializer.serialize(struct, structOI);
// Write the mutation
recordWriter.write(new Text(table), m);
// Close the writer