spark寫orc格式文件

1. 在hive中建表格式存儲格式爲orc

     create table user(id int,name string) stored as orc;  

2. spark寫文件        

    val jsons = "hdfs://localhost:9000/test/artist_orc.json"
    val people = sc.textFile(jsons)
    val schemaString = "id name"
    val schema = StructType(schemaString.split(" ").map(fieldName => {if(fieldName == "name")
      StructField(fieldName, StringType, true) else StructField(fieldName, IntegerType, true)}))

    val rowRDD = people.map(line=>{
      JSONObject.fromObject(line)
    }).map(p => Row(new Integer(p.get("id").toString), p.get("name")))

    val hiveContext = new org.apache.spark.sql.hive.HiveContext(sc)
    val peopleSchemaRDD = hiveContext.createDataFrame(rowRDD, schema)
    peopleSchemaRDD.write.format("orc").save("hdfs://localhost:9000/user/xb/warehouse/artist_orc/adf")