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# Copyright DataStax, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from tests.integration import use_singledc, PROTOCOL_VERSION, TestCluster
import logging
log = logging.getLogger(__name__)
import unittest
from itertools import cycle, count
from threading import Event
from cassandra import ConsistencyLevel
from cassandra.cluster import EXEC_PROFILE_DEFAULT, ExecutionProfile
from cassandra.concurrent import execute_concurrent, execute_concurrent_with_args
from cassandra.policies import HostDistance
from cassandra.query import SimpleStatement
def setup_module():
use_singledc()
class QueryPagingTests(unittest.TestCase):
def setUp(self):
if PROTOCOL_VERSION < 2:
raise unittest.SkipTest(
"Protocol 2.0+ is required for Paging state, currently testing against %r"
% (PROTOCOL_VERSION,))
self.cluster = TestCluster(
execution_profiles={EXEC_PROFILE_DEFAULT: ExecutionProfile(consistency_level=ConsistencyLevel.LOCAL_QUORUM)}
)
if PROTOCOL_VERSION < 3:
self.cluster.set_core_connections_per_host(HostDistance.LOCAL, 1)
self.session = self.cluster.connect(wait_for_all_pools=True)
self.session.execute("TRUNCATE test3rf.test")
def tearDown(self):
self.cluster.shutdown()
def test_paging(self):
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
[(i, ) for i in range(100)])
execute_concurrent(self.session, list(statements_and_params))
prepared = self.session.prepare("SELECT * FROM test3rf.test")
for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
self.session.default_fetch_size = fetch_size
self.assertEqual(100, len(list(self.session.execute("SELECT * FROM test3rf.test"))))
statement = SimpleStatement("SELECT * FROM test3rf.test")
self.assertEqual(100, len(list(self.session.execute(statement))))
self.assertEqual(100, len(list(self.session.execute(prepared))))
def test_paging_state(self):
"""
Test to validate paging state api
@since 3.7.0
@jira_ticket PYTHON-200
@expected_result paging state should returned should be accurate, and allow for queries to be resumed.
@test_category queries
"""
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
[(i, ) for i in range(100)])
execute_concurrent(self.session, list(statements_and_params))
list_all_results = []
self.session.default_fetch_size = 3
result_set = self.session.execute("SELECT * FROM test3rf.test")
while(result_set.has_more_pages):
for row in result_set.current_rows:
self.assertNotIn(row, list_all_results)
list_all_results.extend(result_set.current_rows)
page_state = result_set.paging_state
result_set = self.session.execute("SELECT * FROM test3rf.test", paging_state=page_state)
if(len(result_set.current_rows) > 0):
list_all_results.append(result_set.current_rows)
self.assertEqual(len(list_all_results), 100)
def test_paging_verify_writes(self):
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
[(i, ) for i in range(100)])
execute_concurrent(self.session, statements_and_params)
prepared = self.session.prepare("SELECT * FROM test3rf.test")
for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
self.session.default_fetch_size = fetch_size
results = self.session.execute("SELECT * FROM test3rf.test")
result_array = set()
result_set = set()
for result in results:
result_array.add(result.k)
result_set.add(result.v)
self.assertEqual(set(range(100)), result_array)
self.assertEqual(set([0]), result_set)
statement = SimpleStatement("SELECT * FROM test3rf.test")
results = self.session.execute(statement)
result_array = set()
result_set = set()
for result in results:
result_array.add(result.k)
result_set.add(result.v)
self.assertEqual(set(range(100)), result_array)
self.assertEqual(set([0]), result_set)
results = self.session.execute(prepared)
result_array = set()
result_set = set()
for result in results:
result_array.add(result.k)
result_set.add(result.v)
self.assertEqual(set(range(100)), result_array)
self.assertEqual(set([0]), result_set)
def test_paging_verify_with_composite_keys(self):
ddl = '''
CREATE TABLE test3rf.test_paging_verify_2 (
k1 int,
k2 int,
v int,
PRIMARY KEY(k1, k2)
)'''
self.session.execute(ddl)
statements_and_params = zip(cycle(["INSERT INTO test3rf.test_paging_verify_2 "
"(k1, k2, v) VALUES (0, %s, %s)"]),
[(i, i + 1) for i in range(100)])
execute_concurrent(self.session, statements_and_params)
prepared = self.session.prepare("SELECT * FROM test3rf.test_paging_verify_2")
for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
self.session.default_fetch_size = fetch_size
results = self.session.execute("SELECT * FROM test3rf.test_paging_verify_2")
result_array = []
value_array = []
for result in results:
result_array.append(result.k2)
value_array.append(result.v)
self.assertSequenceEqual(range(100), result_array)
self.assertSequenceEqual(range(1, 101), value_array)
statement = SimpleStatement("SELECT * FROM test3rf.test_paging_verify_2")
results = self.session.execute(statement)
result_array = []
value_array = []
for result in results:
result_array.append(result.k2)
value_array.append(result.v)
self.assertSequenceEqual(range(100), result_array)
self.assertSequenceEqual(range(1, 101), value_array)
results = self.session.execute(prepared)
result_array = []
value_array = []
for result in results:
result_array.append(result.k2)
value_array.append(result.v)
self.assertSequenceEqual(range(100), result_array)
self.assertSequenceEqual(range(1, 101), value_array)
def test_async_paging(self):
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
[(i, ) for i in range(100)])
execute_concurrent(self.session, list(statements_and_params))
prepared = self.session.prepare("SELECT * FROM test3rf.test")
for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
self.session.default_fetch_size = fetch_size
self.assertEqual(100, len(list(self.session.execute_async("SELECT * FROM test3rf.test").result())))
statement = SimpleStatement("SELECT * FROM test3rf.test")
self.assertEqual(100, len(list(self.session.execute_async(statement).result())))
self.assertEqual(100, len(list(self.session.execute_async(prepared).result())))
def test_async_paging_verify_writes(self):
ddl = '''
CREATE TABLE test3rf.test_async_paging_verify (
k1 int,
k2 int,
v int,
PRIMARY KEY(k1, k2)
)'''
self.session.execute(ddl)
statements_and_params = zip(cycle(["INSERT INTO test3rf.test_async_paging_verify "
"(k1, k2, v) VALUES (0, %s, %s)"]),
[(i, i + 1) for i in range(100)])
execute_concurrent(self.session, statements_and_params)
prepared = self.session.prepare("SELECT * FROM test3rf.test_async_paging_verify")
for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
self.session.default_fetch_size = fetch_size
results = self.session.execute_async("SELECT * FROM test3rf.test_async_paging_verify").result()
result_array = []
value_array = []
for result in results:
result_array.append(result.k2)
value_array.append(result.v)
self.assertSequenceEqual(range(100), result_array)
self.assertSequenceEqual(range(1, 101), value_array)
statement = SimpleStatement("SELECT * FROM test3rf.test_async_paging_verify")
results = self.session.execute_async(statement).result()
result_array = []
value_array = []
for result in results:
result_array.append(result.k2)
value_array.append(result.v)
self.assertSequenceEqual(range(100), result_array)
self.assertSequenceEqual(range(1, 101), value_array)
results = self.session.execute_async(prepared).result()
result_array = []
value_array = []
for result in results:
result_array.append(result.k2)
value_array.append(result.v)
self.assertSequenceEqual(range(100), result_array)
self.assertSequenceEqual(range(1, 101), value_array)
def test_paging_callbacks(self):
"""
Test to validate callback api
@since 3.9.0
@jira_ticket PYTHON-733
@expected_result callbacks shouldn't be called twice per message
and the fetch_size should be handled in a transparent way to the user
@test_category queries
"""
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
[(i, ) for i in range(100)])
execute_concurrent(self.session, list(statements_and_params))
prepared = self.session.prepare("SELECT * FROM test3rf.test")
for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
self.session.default_fetch_size = fetch_size
future = self.session.execute_async("SELECT * FROM test3rf.test", timeout=20)
event = Event()
counter = count()
number_of_calls = count()
def handle_page(rows, future, counter, number_of_calls):
next(number_of_calls)
for row in rows:
next(counter)
if future.has_more_pages:
future.start_fetching_next_page()
else:
event.set()
def handle_error(err):
event.set()
self.fail(err)
future.add_callbacks(callback=handle_page, callback_args=(future, counter, number_of_calls),
errback=handle_error)
event.wait()
self.assertEqual(next(number_of_calls), 100 // fetch_size + 1)
self.assertEqual(next(counter), 100)
# simple statement
future = self.session.execute_async(SimpleStatement("SELECT * FROM test3rf.test"), timeout=20)
event.clear()
counter = count()
number_of_calls = count()
future.add_callbacks(callback=handle_page, callback_args=(future, counter, number_of_calls),
errback=handle_error)
event.wait()
self.assertEqual(next(number_of_calls), 100 // fetch_size + 1)
self.assertEqual(next(counter), 100)
# prepared statement
future = self.session.execute_async(prepared, timeout=20)
event.clear()
counter = count()
number_of_calls = count()
future.add_callbacks(callback=handle_page, callback_args=(future, counter, number_of_calls),
errback=handle_error)
event.wait()
self.assertEqual(next(number_of_calls), 100 // fetch_size + 1)
self.assertEqual(next(counter), 100)
def test_concurrent_with_paging(self):
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
[(i, ) for i in range(100)])
execute_concurrent(self.session, list(statements_and_params))
prepared = self.session.prepare("SELECT * FROM test3rf.test")
for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
self.session.default_fetch_size = fetch_size
results = execute_concurrent_with_args(self.session, prepared, [None] * 10)
self.assertEqual(10, len(results))
for (success, result) in results:
self.assertTrue(success)
self.assertEqual(100, len(list(result)))
def test_fetch_size(self):
"""
Ensure per-statement fetch_sizes override the default fetch size.
"""
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
[(i, ) for i in range(100)])
execute_concurrent(self.session, list(statements_and_params))
prepared = self.session.prepare("SELECT * FROM test3rf.test")
self.session.default_fetch_size = 10
result = self.session.execute(prepared, [])
self.assertTrue(result.has_more_pages)
self.session.default_fetch_size = 2000
result = self.session.execute(prepared, [])
self.assertFalse(result.has_more_pages)
self.session.default_fetch_size = None
result = self.session.execute(prepared, [])
self.assertFalse(result.has_more_pages)
self.session.default_fetch_size = 10
prepared.fetch_size = 2000
result = self.session.execute(prepared, [])
self.assertFalse(result.has_more_pages)
prepared.fetch_size = None
result = self.session.execute(prepared, [])
self.assertFalse(result.has_more_pages)
prepared.fetch_size = 10
result = self.session.execute(prepared, [])
self.assertTrue(result.has_more_pages)
prepared.fetch_size = 2000
bound = prepared.bind([])
result = self.session.execute(bound, [])
self.assertFalse(result.has_more_pages)
prepared.fetch_size = None
bound = prepared.bind([])
result = self.session.execute(bound, [])
self.assertFalse(result.has_more_pages)
prepared.fetch_size = 10
bound = prepared.bind([])
result = self.session.execute(bound, [])
self.assertTrue(result.has_more_pages)
bound.fetch_size = 2000
result = self.session.execute(bound, [])
self.assertFalse(result.has_more_pages)
bound.fetch_size = None
result = self.session.execute(bound, [])
self.assertFalse(result.has_more_pages)
bound.fetch_size = 10
result = self.session.execute(bound, [])
self.assertTrue(result.has_more_pages)
s = SimpleStatement("SELECT * FROM test3rf.test", fetch_size=None)
result = self.session.execute(s, [])
self.assertFalse(result.has_more_pages)
s = SimpleStatement("SELECT * FROM test3rf.test")
result = self.session.execute(s, [])
self.assertTrue(result.has_more_pages)
s = SimpleStatement("SELECT * FROM test3rf.test")
s.fetch_size = None
result = self.session.execute(s, [])
self.assertFalse(result.has_more_pages)
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