{"namespace": "devmode", 
"type": "record", 
"name": "gradinfo", 
"fields": [ 
{"name": "col1", "type": "string"}, 
{"name": "col2", "type": "string"}, 
{"name": "col3", "type": "double"}, 
{"name": "col4", "type": "string"}, 
{"name": "col5", "type": "string"}, 
{"name": "col6", "type": "int"} 
] 
}