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"""
Unit tests for PySpark; additional tests are implemented as doctests in
individual modules.
"""
import os
import shutil
import sys
from tempfile import NamedTemporaryFile
import time
import unittest
from pyspark.context import SparkContext
from pyspark.files import SparkFiles
from pyspark.java_gateway import SPARK_HOME
class PySparkTestCase(unittest.TestCase):
def setUp(self):
self._old_sys_path = list(sys.path)
class_name = self.__class__.__name__
self.sc = SparkContext('local[4]', class_name , batchSize=2)
def tearDown(self):
self.sc.stop()
sys.path = self._old_sys_path
# To avoid Akka rebinding to the same port, since it doesn't unbind
# immediately on shutdown
self.sc._jvm.System.clearProperty("spark.driver.port")
class TestCheckpoint(PySparkTestCase):
def setUp(self):
PySparkTestCase.setUp(self)
self.checkpointDir = NamedTemporaryFile(delete=False)
os.unlink(self.checkpointDir.name)
self.sc.setCheckpointDir(self.checkpointDir.name)
def tearDown(self):
PySparkTestCase.tearDown(self)
shutil.rmtree(self.checkpointDir.name)
def test_basic_checkpointing(self):
parCollection = self.sc.parallelize([1, 2, 3, 4])
flatMappedRDD = parCollection.flatMap(lambda x: range(1, x + 1))
self.assertFalse(flatMappedRDD.isCheckpointed())
self.assertIsNone(flatMappedRDD.getCheckpointFile())
flatMappedRDD.checkpoint()
result = flatMappedRDD.collect()
time.sleep(1) # 1 second
self.assertTrue(flatMappedRDD.isCheckpointed())
self.assertEqual(flatMappedRDD.collect(), result)
self.assertEqual(self.checkpointDir.name,
os.path.dirname(flatMappedRDD.getCheckpointFile()))
def test_checkpoint_and_restore(self):
parCollection = self.sc.parallelize([1, 2, 3, 4])
flatMappedRDD = parCollection.flatMap(lambda x: [x])
self.assertFalse(flatMappedRDD.isCheckpointed())
self.assertIsNone(flatMappedRDD.getCheckpointFile())
flatMappedRDD.checkpoint()
flatMappedRDD.count() # forces a checkpoint to be computed
time.sleep(1) # 1 second
self.assertIsNotNone(flatMappedRDD.getCheckpointFile())
recovered = self.sc._checkpointFile(flatMappedRDD.getCheckpointFile())
self.assertEquals([1, 2, 3, 4], recovered.collect())
class TestAddFile(PySparkTestCase):
def test_add_py_file(self):
# To ensure that we're actually testing addPyFile's effects, check that
# this job fails due to `userlibrary` not being on the Python path:
def func(x):
from userlibrary import UserClass
return UserClass().hello()
self.assertRaises(Exception,
self.sc.parallelize(range(2)).map(func).first)
# Add the file, so the job should now succeed:
path = os.path.join(SPARK_HOME, "python/test_support/userlibrary.py")
self.sc.addPyFile(path)
res = self.sc.parallelize(range(2)).map(func).first()
self.assertEqual("Hello World!", res)
def test_add_file_locally(self):
path = os.path.join(SPARK_HOME, "python/test_support/hello.txt")
self.sc.addFile(path)
download_path = SparkFiles.get("hello.txt")
self.assertNotEqual(path, download_path)
with open(download_path) as test_file:
self.assertEquals("Hello World!\n", test_file.readline())
def test_add_py_file_locally(self):
# To ensure that we're actually testing addPyFile's effects, check that
# this fails due to `userlibrary` not being on the Python path:
def func():
from userlibrary import UserClass
self.assertRaises(ImportError, func)
path = os.path.join(SPARK_HOME, "python/test_support/userlibrary.py")
self.sc.addFile(path)
from userlibrary import UserClass
self.assertEqual("Hello World!", UserClass().hello())
class TestIO(PySparkTestCase):
def test_stdout_redirection(self):
import subprocess
def func(x):
subprocess.check_call('ls', shell=True)
self.sc.parallelize([1]).foreach(func)
if __name__ == "__main__":
unittest.main()
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