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spark_csv_to_parquet.py
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spark_csv_to_parquet.py
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#!/usr/bin/env python
# vim:ts=4:sts=4:sw=4:et
#
# Author: Hari Sekhon
# Date: 2015-11-03 21:38:52 +0000 (Tue, 03 Nov 2015)
#
# https://github.com/harisekhon/pytools
#
# License: see accompanying Hari Sekhon LICENSE file
#
# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback
# to help improve or steer this or other code I publish
#
# https://www.linkedin.com/in/harisekhon
#
"""
PySpark program to convert CSV file(s) to Parquet
Must either infer schema from header or define schema (column names) on the command line.
If CSV --has-headers then all fields are assumed to be 'string' unless explicitly specified via --schema.
Written to work across Python 2.x and Spark versions, especially Spark given that the Spark API changed after 1.3
Tested on Spark 1.3.1, 1.4.0, 1.5.1, 1.6.2, 2.0.0
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
# from __future__ import unicode_literals
import os
import sys
libdir = os.path.join(os.path.dirname(__file__), 'pylib')
sys.path.append(libdir)
try:
# pylint: disable=wrong-import-position
from harisekhon.utils import log, isMinVersion, support_msg, isVersionLax, die, getenv, pyspark_path
from harisekhon import CLI
except ImportError as _:
print('module import failed: %s' % _, file=sys.stderr)
print("Did you remember to build the project by running 'make'?", file=sys.stderr)
print("Alternatively perhaps you tried to copy this program out without it's adjacent libraries?", file=sys.stderr)
sys.exit(4)
os.environ['PYSPARK_SUBMIT_ARGS'] = '--packages com.databricks:spark-csv_2.11:1.5.0 %s' \
% os.getenv('PYSPARK_SUBMIT_ARGS', '')
pyspark_path()
from pyspark import SparkContext # pylint: disable=wrong-import-position,import-error
from pyspark import SparkConf # pylint: disable=wrong-import-position,import-error
from pyspark.sql import SQLContext # pylint: disable=wrong-import-position,import-error
from pyspark.sql.types import * # pylint: disable=wrong-import-position,import-error,wildcard-import
from pyspark.sql.types import StructType, StructField # pylint: disable=wrong-import-position,import-error
__author__ = 'Hari Sekhon'
__version__ = '0.7.3'
class SparkCSVToParquet(CLI):
def __init__(self):
# Python 2.x
super(SparkCSVToParquet, self).__init__()
# Python 3.x
# super().__init__()
# logging.config.fileConfig(os.path.join(libdir, 'resources', 'logging.conf'))
# log = logging.getLogger(self.__class__.__name__)
self.verbose_default = 2
self.timeout_default = 86400
self.schema = None
self.types_mapping = {}
# dynamically generate types mapping from available types in PySpark
from pyspark.sql import types # pylint: disable=wrong-import-position,import-error
for _ in dir(types):
if _.endswith('Type'):
self.types_mapping[_[:-4].lower()] = _
if 'integer' in self.types_mapping:
# because I like typing int better than integer
self.types_mapping['int'] = self.types_mapping['integer']
# @override
def add_options(self):
self.add_opt('-c', '--csv', metavar='<file/dir>',
help='CSV input file/dir ($CSV)',
default=getenv('CSV'))
self.add_opt('-p', '--parquet-dir', metavar='<dir>',
help='Parquet output dir ($PARQUETDIR)',
default=getenv('PARQUETDIR'))
self.add_opt('-e', '--has-header', action='store_true',
help='CSV has header. Infers schema if --schema is not given in which case all ' +
"types are assumed to be 'string'. Must specify --schema to override this")
self.add_opt('-s', '--schema', metavar='name:type,name2:type2,...',
help="Schema for CSV. Types default to 'string'. Possible types are: %s" \
% ', '.join(sorted(self.types_mapping)))
def parse_args(self):
self.no_args()
if not self.get_opt('csv'):
self.usage('--csv not defined')
if not self.get_opt('parquet_dir'):
self.usage('--parquet-dir not defined')
if not (self.get_opt('has_header') or self.get_opt('schema')):
self.usage('must specify either --has-header or --schema')
# no longer mutually exclusive now this support schema override
# if self.get_opt('has_header') and self.get_opt('schema'):
# self.usage('--has-header and --schema are mutually exclusive')
def run(self):
csv_file = self.get_opt('csv')
parquet_dir = self.get_opt('parquet_dir')
has_header = self.get_opt('has_header')
# I don't know why the Spark guys made this a string instead of a bool
header_str = 'false'
if has_header:
header_str = 'true'
schema = self.get_opt('schema')
# let Spark fail if csv/parquet aren't available
# can't check paths exist as want to remain generically portable
# to HDFS, local filesystm or any other uri scheme Spark supports
log.info("CSV Source: %s" % csv_file)
log.info("Parquet Destination: %s" % parquet_dir)
if schema:
def get_type(arg):
arg = str(arg).lower()
if arg not in self.types_mapping:
self.usage("invalid type '%s' defined in --schema, must be one of: %s"
% (arg, ', '.join(sorted(self.types_mapping.keys()))))
# return self.types_mapping[arg]
module = __import__('pyspark.sql.types', globals(), locals(), ['types'], -1)
class_ = getattr(module, self.types_mapping[arg])
_ = class_()
return _
def create_struct(arg):
name = str(arg).strip()
data_type = 'string'
if ':' in arg:
(name, data_type) = arg.split(':', 1)
data_class = get_type(data_type)
return StructField(name, data_class, True)
# see https://github.com/databricks/spark-csv#python-api
self.schema = StructType([create_struct(_) for _ in schema.split(',')])
log.info('generated CSV => Spark schema')
conf = SparkConf().setAppName('HS PySpark CSV => Parquet')
sc = SparkContext(conf=conf) # pylint: disable=invalid-name
sqlContext = SQLContext(sc) # pylint: disable=invalid-name
spark_version = sc.version
log.info('Spark version detected as %s' % spark_version)
if not isVersionLax(spark_version):
die("Spark version couldn't be determined. " + support_msg('pytools'))
# pylint: disable=invalid-name
df = None
if isMinVersion(spark_version, 1.4):
if has_header and not schema:
log.info('inferring schema from CSV headers')
df = sqlContext.read.format('com.databricks.spark.csv')\
.options(header=header_str, inferschema='true')\
.load(csv_file)
else:
log.info('using explicitly defined schema')
df = sqlContext.read\
.format('com.databricks.spark.csv')\
.options(header=header_str)\
.load(csv_file, schema=self.schema)
df.write.parquet(parquet_dir)
else:
log.warn('running legacy code for Spark <= 1.3')
if has_header and not schema:
log.info('inferring schema from CSV headers')
df = sqlContext.load(source="com.databricks.spark.csv", path=csv_file,
header=header_str, inferSchema='true')
elif self.schema:
log.info('using explicitly defined schema')
schema = self.schema
df = sqlContext.load(source="com.databricks.spark.csv", path=csv_file,
header=header_str, schema=schema)
else:
die('no header and no schema, caught late')
df.saveAsParquetFile(parquet_dir)
if __name__ == '__main__':
SparkCSVToParquet().main()