将csv转为parquet_linux中如何将csv文件保存为parquet文件

环境

• centos 6.5
• CHD 5.15
• spark 1

csv内容

$ cat test.txt
1|2|3|test
2|4|6|wwww
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使用pyspark

from pyspark import SparkContext,SparkConf
from pyspark.sql import SQLContext
from pyspark.sql.types import *

if __name__ == "__main__":
    sc = SparkContext(appName="CSV2Parquet")
    sqlContext = SQLContext(sc)
    schema = StructType([
            StructField("id", StringType(), True),
            StructField("num1", StringType(), True),
            StructField("num2", StringType(), True),
            StructField("string", StringType(), True),
		])
    rdd = sc.textFile("/var/tmp/test.txt").map(lambda line: line.split("|"))
    df = sqlContext.createDataFrame(rdd, schema)
    df.write.parquet('/var/tmp/test.parq')
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CDH提供parquet-tools命令查看parquet文件

parquet-tools cat sample.parq
parquet-tools head -n 2 sample.parq
parquet-tools schema sample.parq
parquet-tools meta sample.parq
parquet-tools dump
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