consistency_test.py

import queue
import sys
import threading
import time
import pytest
import logging
from collections import OrderedDict, namedtuple
from copy import deepcopy

from cassandra import ConsistencyLevel, consistency_value_to_name
from cassandra.query import BatchStatement, BatchType, SimpleStatement

from tools.assertions import (assert_all, assert_length_equal, assert_none,
                              assert_unavailable)
from dtest import MultiError, Tester, create_ks, create_cf
from tools.data import (create_c1c2_table, insert_c1c2, insert_columns,
                        query_c1c2, rows_to_list)
from tools.jmxutils import JolokiaAgent, make_mbean, remove_perf_disable_shared_mem

since = pytest.mark.since
logger = logging.getLogger(__name__)

ExpectedConsistency = namedtuple('ExpectedConsistency', ('num_write_nodes', 'num_read_nodes', 'is_strong'))


class TestHelper(Tester):

    def _is_local(self, cl):
        return (cl == ConsistencyLevel.LOCAL_QUORUM or
                cl == ConsistencyLevel.LOCAL_ONE or
                cl == ConsistencyLevel.LOCAL_SERIAL)

    def _is_conditional(self, cl):
        return (cl == ConsistencyLevel.SERIAL or
                cl == ConsistencyLevel.LOCAL_SERIAL)

    def _required_nodes(self, cl, rf_factors, dc):
        """
        Return the number of nodes required by this consistency level
        in the current data center, specified by the dc parameter,
        given a list of replication factors, one per dc.
        """
        return {
            ConsistencyLevel.ANY: 1,
            ConsistencyLevel.ONE: 1,
            ConsistencyLevel.TWO: 2,
            ConsistencyLevel.THREE: 3,
            ConsistencyLevel.QUORUM: sum(rf_factors) // 2 + 1,
            ConsistencyLevel.ALL: sum(rf_factors),
            ConsistencyLevel.LOCAL_QUORUM: rf_factors[dc] // 2 + 1,
            ConsistencyLevel.EACH_QUORUM: rf_factors[dc] // 2 + 1,
            ConsistencyLevel.SERIAL: sum(rf_factors) // 2 + 1,
            ConsistencyLevel.LOCAL_SERIAL: rf_factors[dc] // 2 + 1,
            ConsistencyLevel.LOCAL_ONE: 1,
        }[cl]

    def get_expected_consistency(self, idx, rf_factors, write_cl, read_cl):
            """
            Given a node index, identify to which data center we are connecting and return
            the expected consistency: number of nodes we write to, read from, and whether
            we should have strong consistency, that is whether R + W > N
            """
            nodes = [self.nodes] if isinstance(self.nodes, int) else self.nodes

            def get_data_center():
                """
                :return: the data center corresponding to this node
                """
                dc = 0
                for i in range(1, len(nodes)):
                    if idx < sum(nodes[:i]):
                        break
                    dc += 1
                return dc

            data_center = get_data_center()
            if write_cl == ConsistencyLevel.EACH_QUORUM:
                write_nodes = sum([self._required_nodes(write_cl, rf_factors, i) for i in range(0, len(nodes))])
            else:
                write_nodes = self._required_nodes(write_cl, rf_factors, data_center)

            read_nodes = self._required_nodes(read_cl, rf_factors, data_center)
            is_strong = read_nodes + write_nodes > sum(rf_factors)

            return ExpectedConsistency(num_write_nodes=write_nodes,
                                       num_read_nodes=read_nodes,
                                       is_strong=is_strong)

    def _should_succeed(self, cl, rf_factors, num_nodes_alive, current):
        """
        Return true if the read or write operation should succeed based on
        the consistency level requested, the replication factors and the
        number of nodes alive in each data center.
        """
        if self._is_local(cl):
            return num_nodes_alive[current] >= self._required_nodes(cl, rf_factors, current)
        elif cl == ConsistencyLevel.EACH_QUORUM:
            for i in range(0, len(rf_factors)):
                if num_nodes_alive[i] < self._required_nodes(cl, rf_factors, i):
                    return False
            return True
        else:
            return sum(num_nodes_alive) >= self._required_nodes(cl, rf_factors, current)

    def _start_cluster(self, save_sessions=False, requires_local_reads=False):
        cluster = self.cluster
        nodes = self.nodes
        rf = self.rf

        configuration_options = {'hinted_handoff_enabled': False}

        # If we must read from the local replica first, then the dynamic snitch poses a problem
        # because occasionally it may think that another replica is preferable even if the
        # coordinator is a replica
        if requires_local_reads:
            configuration_options['dynamic_snitch'] = False

        cluster.set_configuration_options(values=configuration_options)
        cluster.populate(nodes)

        if requires_local_reads and isinstance(nodes, int):
            # Changing the snitch to PropertyFileSnitch even in the
            # single dc tests ensures that StorageProxy sorts the replicas eligible
            # for reading by proximity to the local host, essentially picking the
            # local host for local reads, see IEndpointSnitch.sortByProximity() and
            # StorageProxy.getLiveSortedEndpoints(), which is called by the AbstractReadExecutor
            # to determine the target replicas. The default case, a SimpleSnitch wrapped in
            # a dynamic snitch, may rarely choose a different replica.
            logger.debug('Changing snitch for single dc case')
            for node in cluster.nodelist():
                node.data_center = 'dc1'
            cluster.set_configuration_options(values={
                'endpoint_snitch': 'org.apache.cassandra.locator.PropertyFileSnitch'})

        cluster.start(wait_for_binary_proto=True, wait_other_notice=True)

        self.ksname = 'mytestks'
        session = self.patient_exclusive_cql_connection(cluster.nodelist()[0])

        create_ks(session, self.ksname, rf)
        self.create_tables(session, requires_local_reads)

        if save_sessions:
            self.sessions = []
            self.sessions.append(session)
            for node in cluster.nodelist()[1:]:
                self.sessions.append(self.patient_exclusive_cql_connection(node, self.ksname))

    def create_tables(self, session, requires_local_reads):
        self.create_users_table(session, requires_local_reads)
        self.create_counters_table(session, requires_local_reads)
        session.cluster.control_connection.wait_for_schema_agreement(wait_time=60)

    def truncate_tables(self, session):
        statement = SimpleStatement("TRUNCATE users", ConsistencyLevel.ALL)
        session.execute(statement)
        statement = SimpleStatement("TRUNCATE counters", ConsistencyLevel.ALL)
        session.execute(statement)

    def create_users_table(self, session, requires_local_reads):
        create_cmd = """
            CREATE TABLE users (
                userid int PRIMARY KEY,
                firstname text,
                lastname text,
                age int
            )"""

        if requires_local_reads:
            create_cmd += " WITH " + self.get_local_reads_properties(self.cluster.version())

        session.execute(create_cmd)

    @staticmethod
    def get_local_reads_properties(cluster_version):
        """
        If we must read from the local replica first, then we should disable read repair and
        speculative retry, see CASSANDRA-12092
        """
        if cluster_version < '4.0':
            return " dclocal_read_repair_chance = 0 AND read_repair_chance = 0 AND speculative_retry =  'NONE'"
        else:
            return " speculative_retry =  'NONE'"

    def insert_user(self, session, userid, age, consistency, serial_consistency=None):
        text = "INSERT INTO users (userid, firstname, lastname, age) VALUES ({}, 'first{}', 'last{}', {}) {}"\
            .format(userid, userid, userid, age, "IF NOT EXISTS" if serial_consistency else "")
        statement = SimpleStatement(text, consistency_level=consistency, serial_consistency_level=serial_consistency)
        session.execute(statement)

    def update_user(self, session, userid, age, consistency, serial_consistency=None, prev_age=None):
        text = "UPDATE users SET age = {} WHERE userid = {}".format(age, userid)
        if serial_consistency and prev_age:
            text = text + " IF age = {}".format(prev_age)
        statement = SimpleStatement(text, consistency_level=consistency, serial_consistency_level=serial_consistency)
        session.execute(statement)

    def delete_user(self, session, userid, consistency):
        statement = SimpleStatement("DELETE FROM users where userid = {}".format(userid), consistency_level=consistency)
        session.execute(statement)

    def query_user(self, session, userid, age, consistency, check_ret=True):
        statement = SimpleStatement("SELECT userid, age FROM users where userid = {}".format(userid), consistency_level=consistency)
        res = session.execute(statement)
        expected = [[userid, age]] if age else []
        ret = rows_to_list(res) == expected
        if check_ret:
            assert ret, "Got {} from {}, expected {} at {}".format(rows_to_list(res), session.cluster.contact_points, expected, consistency_value_to_name(consistency))
        return ret

    def create_counters_table(self, session, requires_local_reads):
        create_cmd = """
            CREATE TABLE counters (
                id int PRIMARY KEY,
                c counter
            )"""

        if requires_local_reads:
            create_cmd += " WITH " + self.get_local_reads_properties(self.cluster.version())

        session.execute(create_cmd)

    def update_counter(self, session, id, consistency, serial_consistency=None):
        text = "UPDATE counters SET c = c + 1 WHERE id = {}".format(id)
        statement = SimpleStatement(text, consistency_level=consistency, serial_consistency_level=serial_consistency)
        session.execute(statement)
        return statement

    def query_counter(self, session, id, val, consistency, check_ret=True):
        statement = SimpleStatement("SELECT * from counters WHERE id = {}".format(id), consistency_level=consistency)
        ret = rows_to_list(session.execute(statement))
        if check_ret:
            assert ret[0][1] == val, "Got {} from {}, expected {} at {}".format(ret[0][1],
                                                                                        session.cluster.contact_points,
                                                                                        val,
                                                                                        consistency_value_to_name(consistency))
        return ret[0][1] if ret else 0


class TestAvailability(TestHelper):
    """
    Test that we can read and write depending on the number of nodes that are alive and the consistency levels.
    """

    def _test_simple_strategy(self, combinations):
        """
        Helper test function for a single data center: invoke _test_insert_query_from_node() for each node
        and each combination, progressively stopping nodes.
        """
        cluster = self.cluster
        nodes = self.nodes
        rf = self.rf

        num_alive = nodes
        for node in range(nodes):
            logger.debug('Testing node {} in single dc with {} nodes alive'.format(node, num_alive))
            session = self.patient_exclusive_cql_connection(cluster.nodelist()[node], self.ksname)
            for combination in combinations:
                self._test_insert_query_from_node(session, 0, [rf], [num_alive], *combination)

            self.cluster.nodelist()[node].stop()
            num_alive -= 1

    def _test_network_topology_strategy(self, combinations):
        """
        Helper test function for multiple data centers, invoke _test_insert_query_from_node() for each node
        in each dc and each combination, progressively stopping nodes.
        """
        cluster = self.cluster
        nodes = self.nodes
        rf = self.rf

        nodes_alive = deepcopy(nodes)
        rf_factors = list(rf.values())

        for i in range(0, len(nodes)):  # for each dc
            logger.debug('Testing dc {} with rf {} and {} nodes alive'.format(i, rf_factors[i], nodes_alive))
            for n in range(nodes[i]):  # for each node in this dc
                logger.debug('Testing node {} in dc {} with {} nodes alive'.format(n, i, nodes_alive))
                node = n + sum(nodes[:i])
                session = self.patient_exclusive_cql_connection(cluster.nodelist()[node], self.ksname)
                for combination in combinations:
                    self._test_insert_query_from_node(session, i, rf_factors, nodes_alive, *combination)

                self.cluster.nodelist()[node].stop(wait_other_notice=True)
                nodes_alive[i] -= 1

    def _test_insert_query_from_node(self, session, dc_idx, rf_factors, num_nodes_alive, write_cl, read_cl, serial_cl=None, check_ret=True):
        """
        Test availability for read and write via the session passed in as a parameter.
        """
        logger.debug("Connected to %s for %s/%s/%s" %
                 (session.cluster.contact_points, consistency_value_to_name(write_cl), consistency_value_to_name(read_cl), consistency_value_to_name(serial_cl)))

        start = 0
        end = 100
        age = 30

        if self._should_succeed(write_cl, rf_factors, num_nodes_alive, dc_idx):
            for n in range(start, end):
                self.insert_user(session, n, age, write_cl, serial_cl)
        else:
            assert_unavailable(self.insert_user, session, end, age, write_cl, serial_cl)

        if self._should_succeed(read_cl, rf_factors, num_nodes_alive, dc_idx):
            for n in range(start, end):
                self.query_user(session, n, age, read_cl, check_ret)
        else:
            assert_unavailable(self.query_user, session, end, age, read_cl, check_ret)

    def test_simple_strategy(self):
        """
        Test for a single datacenter, using simple replication strategy.
        """
        self.nodes = 3
        self.rf = 3

        self._start_cluster()

        combinations = [
            (ConsistencyLevel.ALL, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.ONE, ConsistencyLevel.ONE, None, False),
            (ConsistencyLevel.ONE, ConsistencyLevel.ALL),
            (ConsistencyLevel.ALL, ConsistencyLevel.ONE),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.TWO),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.THREE),
            (ConsistencyLevel.TWO, ConsistencyLevel.TWO),
            (ConsistencyLevel.THREE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ANY, ConsistencyLevel.ONE, None, False),
            (ConsistencyLevel.LOCAL_ONE, ConsistencyLevel.LOCAL_ONE, None, False),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.SERIAL, ConsistencyLevel.SERIAL),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_SERIAL, ConsistencyLevel.LOCAL_SERIAL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.LOCAL_SERIAL, ConsistencyLevel.SERIAL),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.SERIAL, ConsistencyLevel.LOCAL_SERIAL),
        ]

        self._test_simple_strategy(combinations)

    @since("3.0")
    def test_simple_strategy_each_quorum(self):
        """
        @jira_ticket CASSANDRA-10584
        Test for a single datacenter, using simple replication strategy, only
        the each quorum reads.
        """
        self.nodes = 3
        self.rf = 3

        self._start_cluster()

        combinations = [
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.EACH_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.EACH_QUORUM),
        ]

        self._test_simple_strategy(combinations)

    @pytest.mark.resource_intensive
    def test_network_topology_strategy(self):
        """
        Test for multiple datacenters, using network topology replication strategy.
        """
        self.nodes = [3, 3, 3]
        self.rf = OrderedDict([('dc1', 3), ('dc2', 3), ('dc3', 3)])

        self._start_cluster()

        combinations = [
            (ConsistencyLevel.ALL, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.ONE, ConsistencyLevel.ONE, None, False),
            (ConsistencyLevel.ONE, ConsistencyLevel.ALL),
            (ConsistencyLevel.ALL, ConsistencyLevel.ONE),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.TWO),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.THREE),
            (ConsistencyLevel.TWO, ConsistencyLevel.TWO),
            (ConsistencyLevel.THREE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ANY, ConsistencyLevel.ONE, None, False),
            (ConsistencyLevel.LOCAL_ONE, ConsistencyLevel.LOCAL_ONE, None, False),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.SERIAL, ConsistencyLevel.SERIAL),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_SERIAL, ConsistencyLevel.LOCAL_SERIAL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.LOCAL_SERIAL, ConsistencyLevel.SERIAL),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.SERIAL, ConsistencyLevel.LOCAL_SERIAL),
        ]

        self._test_network_topology_strategy(combinations)

    @pytest.mark.resource_intensive
    @since("3.0")
    def test_network_topology_strategy_each_quorum(self):
        """
        @jira_ticket CASSANDRA-10584
        Test for multiple datacenters, using network topology strategy, only
        the each quorum reads.
        """
        self.nodes = [3, 3, 3]
        self.rf = OrderedDict([('dc1', 3), ('dc2', 3), ('dc3', 3)])

        self._start_cluster()

        combinations = [
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.EACH_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.EACH_QUORUM),
        ]

        self._test_network_topology_strategy(combinations)


class TestAccuracy(TestHelper):
    """
    Test that we can consistently read back what we wrote depending on the write and read consistency levels.
    """

    class Validation:

        def __init__(self, outer, sessions, nodes, rf_factors, start, end, write_cl, read_cl, serial_cl=None):
            self.outer = outer
            self.sessions = sessions
            self.nodes = nodes
            self.rf_factors = rf_factors
            self.start = start
            self.end = end
            self.write_cl = write_cl
            self.read_cl = read_cl
            self.serial_cl = serial_cl

            logger.debug('Testing accuracy with WRITE/READ/SERIAL consistency set to {}/{}/{} (keys : {} to {})'
                      .format(consistency_value_to_name(write_cl), consistency_value_to_name(read_cl), consistency_value_to_name(serial_cl), start, end - 1))

        def get_expected_consistency(self, idx):
            return self.outer.get_expected_consistency(idx, self.rf_factors, self.write_cl, self.read_cl)

        def validate_users(self):
            """
            First validation function: update the users table sending different values to different sessions
            and check that when strong_consistency is true (R + W > N) we read back the latest value from all sessions.
            If strong_consistency is false we instead check that we read back the latest value from at least
            the number of nodes we wrote to.
            """
            outer = self.outer
            sessions = self.sessions
            start = self.start
            end = self.end
            write_cl = self.write_cl
            read_cl = self.read_cl
            serial_cl = self.serial_cl

            def check_all_sessions(idx, n, val):
                expected_consistency = self.get_expected_consistency(idx)
                num = 0
                for s in sessions:
                    if outer.query_user(s, n, val, read_cl, check_ret=expected_consistency.is_strong):
                        num += 1
                assert num >= expected_consistency.num_write_nodes, "Failed to read value from sufficient number of nodes," + \
                                     " required {} but got {} - [{}, {}]".format(expected_consistency.num_write_nodes, num, n, val)

            for n in range(start, end):
                age = 30
                for s in range(0, len(sessions)):
                    outer.insert_user(sessions[s], n, age, write_cl, serial_cl)
                    check_all_sessions(s, n, age)
                    if serial_cl is None:
                        age += 1
                for s in range(0, len(sessions)):
                    outer.update_user(sessions[s], n, age, write_cl, serial_cl, age - 1)
                    check_all_sessions(s, n, age)
                    age += 1
                outer.delete_user(sessions[0], n, write_cl)
                check_all_sessions(s, n, None)

        def validate_counters(self):
            """
            Second validation function: update the counters table sending different values to different sessions
            and check that when strong_consistency is true (R + W > N) we read back the latest value from all sessions.
            If strong_consistency is false we instead check that we read back the latest value from at least
            the number of nodes we wrote to.
            """
            outer = self.outer
            sessions = self.sessions
            start = self.start
            end = self.end
            write_cl = self.write_cl
            read_cl = self.read_cl
            serial_cl = self.serial_cl

            def check_all_sessions(idx, n, val):
                expected_consistency = self.get_expected_consistency(idx)
                results = []
                for s in sessions:
                    results.append(outer.query_counter(s, n, val, read_cl, check_ret=expected_consistency.is_strong))

                assert results.count(val) >= expected_consistency.num_write_nodes, "Failed to read value from sufficient number of nodes, required {} nodes to have a" + \
                                     " counter value of {} at key {}, instead got these values: {}".format(expected_consistency.num_write_nodes, val, n, results)

            for n in range(start, end):
                c = 1
                for s in range(0, len(sessions)):
                    outer.update_counter(sessions[s], n, write_cl, serial_cl)
                    check_all_sessions(s, n, c)
                    # Update the counter again at CL ALL to make sure all nodes are on the same page
                    # since a counter update requires a read
                    outer.update_counter(sessions[s], n, ConsistencyLevel.ALL)
                    c += 2  # the counter was updated twice

    def _run_test_function_in_parallel(self, valid_fcn, nodes, rf_factors, combinations):
        """
        Run a test function in parallel.
        """

        requires_local_reads = False
        for combination in combinations:
            for i, _ in enumerate(nodes):
                expected_consistency = self.get_expected_consistency(i, rf_factors, combination[0], combination[1])
                if not expected_consistency.is_strong:
                    # if at least one combination does not reach strong consistency, in order to validate weak
                    # consistency we require local reads, see CASSANDRA-12092 for details.
                    requires_local_reads = True
                    break

            if requires_local_reads:
                break

        self._start_cluster(save_sessions=True, requires_local_reads=requires_local_reads)

        input_queue = queue.Queue()
        exceptions_queue = queue.Queue()

        def run():
            while not input_queue.empty():
                try:
                    v = TestAccuracy.Validation(self, self.sessions, nodes, rf_factors, *input_queue.get(block=False))
                    valid_fcn(v)
                except queue.Empty:
                    pass
                except Exception:
                    exceptions_queue.put(sys.exc_info())

        start = 0
        num_keys = 50
        for combination in combinations:
            input_queue.put((start, start + num_keys) + combination)
            start += num_keys

        threads = []
        for n in range(0, 8):
            t = threading.Thread(target=run)
            t.setDaemon(True)
            t.start()
            threads.append(t)

        logger.debug("Waiting for workers to complete")
        while exceptions_queue.empty():
            time.sleep(0.1)
            if len([t for t in threads if t.isAlive()]) == 0:
                break

        if not exceptions_queue.empty():
            _, exceptions, tracebacks = list(zip(*exceptions_queue.queue))
            raise MultiError(exceptions=exceptions, tracebacks=tracebacks)

    @pytest.mark.resource_intensive
    def test_simple_strategy_users(self):
        """
        Test for a single datacenter, users table, only the each quorum reads.
        """
        self.nodes = 5
        self.rf = 3

        combinations = [
            (ConsistencyLevel.ALL, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.ALL, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.TWO, ConsistencyLevel.TWO),
            (ConsistencyLevel.ONE, ConsistencyLevel.THREE),
            (ConsistencyLevel.THREE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ANY, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.TWO),
            (ConsistencyLevel.TWO, ConsistencyLevel.ONE),
            # These are multi-DC consistency levels that should default to quorum calls
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.SERIAL, ConsistencyLevel.SERIAL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.LOCAL_SERIAL, ConsistencyLevel.SERIAL),
        ]

        logger.debug("Testing single dc, users")
        self._run_test_function_in_parallel(TestAccuracy.Validation.validate_users, [self.nodes], [self.rf], combinations)

    @pytest.mark.resource_intensive
    @since("3.0")
    def test_simple_strategy_each_quorum_users(self):
        """
        @jira_ticket CASSANDRA-10584
        Test for a single datacenter, users table, only the each quorum reads.
        """
        self.nodes = 5
        self.rf = 3

        combinations = [
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.EACH_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.EACH_QUORUM),
        ]

        logger.debug("Testing single dc, users, each quorum reads")
        self._run_test_function_in_parallel(TestAccuracy.Validation.validate_users, [self.nodes], [self.rf], combinations)

    @pytest.mark.resource_intensive
    def test_network_topology_strategy_users(self):
        """
        Test for multiple datacenters, users table.
        """
        self.nodes = [3, 3]
        self.rf = OrderedDict([('dc1', 3), ('dc2', 3)])

        combinations = [
            (ConsistencyLevel.ALL, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.ALL, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.ONE),
            (ConsistencyLevel.TWO, ConsistencyLevel.TWO),
            (ConsistencyLevel.ONE, ConsistencyLevel.THREE),
            (ConsistencyLevel.THREE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ANY, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.TWO),
            (ConsistencyLevel.TWO, ConsistencyLevel.ONE),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.SERIAL, ConsistencyLevel.SERIAL),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_SERIAL, ConsistencyLevel.LOCAL_SERIAL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.LOCAL_SERIAL, ConsistencyLevel.SERIAL),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.SERIAL, ConsistencyLevel.LOCAL_SERIAL),
        ]

        logger.debug("Testing multiple dcs, users")
        self._run_test_function_in_parallel(TestAccuracy.Validation.validate_users, self.nodes, list(self.rf.values()), combinations),

    @pytest.mark.resource_intensive
    @since("3.0")
    def test_network_topology_strategy_each_quorum_users(self):
        """
        @jira_ticket CASSANDRA-10584
        Test for a multiple datacenters, users table, only the each quorum
        reads.
        """
        self.nodes = [3, 3]
        self.rf = OrderedDict([('dc1', 3), ('dc2', 3)])

        combinations = [
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.EACH_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.EACH_QUORUM),
        ]

        logger.debug("Testing multiple dcs, users, each quorum reads")
        self._run_test_function_in_parallel(TestAccuracy.Validation.validate_users, self.nodes, list(self.rf.values()), combinations)

    def test_simple_strategy_counters(self):
        """
        Test for a single datacenter, counters table.
        """
        self.nodes = 3
        self.rf = 3

        combinations = [
            (ConsistencyLevel.ALL, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.ALL, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.TWO, ConsistencyLevel.TWO),
            (ConsistencyLevel.ONE, ConsistencyLevel.THREE),
            (ConsistencyLevel.THREE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.TWO),
            (ConsistencyLevel.TWO, ConsistencyLevel.ONE),
            # These are multi-DC consistency levels that should default to quorum calls
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
        ]

        logger.debug("Testing single dc, counters")
        self._run_test_function_in_parallel(TestAccuracy.Validation.validate_counters, [self.nodes], [self.rf], combinations)

    @since("3.0")
    def test_simple_strategy_each_quorum_counters(self):
        """
        @jira_ticket CASSANDRA-10584
        Test for a single datacenter, counters table, only the each quorum
        reads.
        """
        self.nodes = 3
        self.rf = 3

        combinations = [
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.EACH_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.EACH_QUORUM),
        ]

        logger.debug("Testing single dc, counters, each quorum reads")
        self._run_test_function_in_parallel(TestAccuracy.Validation.validate_counters, [self.nodes], [self.rf], combinations)

    @pytest.mark.resource_intensive
    def test_network_topology_strategy_counters(self):
        """
        Test for multiple datacenters, counters table.
        """
        self.nodes = [3, 3]
        self.rf = OrderedDict([('dc1', 3), ('dc2', 3)])

        combinations = [
            (ConsistencyLevel.ALL, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.ALL, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.ALL),
            (ConsistencyLevel.QUORUM, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.QUORUM),
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.LOCAL_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.ONE),
            (ConsistencyLevel.TWO, ConsistencyLevel.TWO),
            (ConsistencyLevel.ONE, ConsistencyLevel.THREE),
            (ConsistencyLevel.THREE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.ONE),
            (ConsistencyLevel.ONE, ConsistencyLevel.TWO),
            (ConsistencyLevel.TWO, ConsistencyLevel.ONE),
        ]

        logger.debug("Testing multiple dcs, counters")
        self._run_test_function_in_parallel(TestAccuracy.Validation.validate_counters, self.nodes, list(self.rf.values()), combinations),

    @pytest.mark.resource_intensive
    @since("3.0")
    def test_network_topology_strategy_each_quorum_counters(self):
        """
        @jira_ticket CASSANDRA-10584
        Test for multiple datacenters, counters table, only the each quorum
        reads.
        """
        self.nodes = [3, 3]
        self.rf = OrderedDict([('dc1', 3), ('dc2', 3)])

        combinations = [
            (ConsistencyLevel.LOCAL_QUORUM, ConsistencyLevel.EACH_QUORUM),
            (ConsistencyLevel.EACH_QUORUM, ConsistencyLevel.EACH_QUORUM),
        ]

        logger.debug("Testing multiple dcs, counters, each quorum reads")
        self._run_test_function_in_parallel(TestAccuracy.Validation.validate_counters, self.nodes, list(self.rf.values()), combinations),


class TestConsistency(Tester):

    @since('3.0')
    def test_14513_transient(self):
        """
        @jira_ticket CASSANDRA-14513

        A reproduction / regression test to illustrate CASSANDRA-14513:
        transient data loss when doing reverse-order queries with range
        tombstones in place.

        This test shows how the bug can cause queries to return invalid
        results by just a single node.
        """
        cluster = self.cluster

        # set column_index_size_in_kb to 1 for a slightly easier reproduction sequence
        cluster.set_configuration_options(values={'column_index_size_in_kb': 1})

        cluster.populate(1).start(wait_other_notice=True)
        node1 = cluster.nodelist()[0]

        session = self.patient_cql_connection(node1)

        query = "CREATE KEYSPACE journals WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 1};"
        session.execute(query)

        query = 'CREATE TABLE journals.logs (user text, year int, month int, day int, title text, body text, PRIMARY KEY ((user), year, month, day, title));';
        session.execute(query)

        # populate the table
        stmt = session.prepare('INSERT INTO journals.logs (user, year, month, day, title, body) VALUES (?, ?, ?, ?, ?, ?);');
        for year in range(2011, 2018):
            for month in range(1, 13):
                for day in range(1, 31):
                    session.execute(stmt, ['beobal', year, month, day, 'title', 'Lorem ipsum dolor sit amet'], ConsistencyLevel.ONE)
        node1.flush()

        # make sure the data is there
        assert_all(session,
                   "SELECT COUNT(*) FROM journals.logs WHERE user = 'beobal' AND year < 2018 ORDER BY year DESC;",
                   [[7 * 12 * 30]],
                   cl=ConsistencyLevel.ONE)

        # generate an sstable with an RT that opens in the penultimate block and closes in the last one
        stmt = session.prepare('DELETE FROM journals.logs WHERE user = ? AND year = ? AND month = ? AND day = ?;')
        batch = BatchStatement(batch_type=BatchType.UNLOGGED)
        for day in range(1, 31):
            batch.add(stmt, ['beobal', 2018, 1, day])
        session.execute(batch)
        node1.flush()

        # the data should still be there for years 2011-2017, but prior to CASSANDRA-14513 it would've been gone
        assert_all(session,
                   "SELECT COUNT(*) FROM journals.logs WHERE user = 'beobal' AND year < 2018 ORDER BY year DESC;",
                   [[7 * 12 * 30]],
                   cl=ConsistencyLevel.ONE)

    @since('3.0')
    def test_14513_permanent(self):
        """
        @jira_ticket CASSANDRA-14513

        A reproduction / regression test to illustrate CASSANDRA-14513:
        permanent data loss when doing reverse-order queries with range
        tombstones in place.

        This test shows how the invalid RT can propagate to other replicas
        and delete data permanently.
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        # set column_index_size_in_kb to 1 for a slightly easier reproduction sequence
        cluster.set_configuration_options(values={'column_index_size_in_kb': 1, 'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(3).start(wait_other_notice=True)
        node1, node2, node3 = cluster.nodelist()

        session = self.patient_exclusive_cql_connection(node1)

        query = "CREATE KEYSPACE journals WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 3};"
        session.execute(query)

        query = 'CREATE TABLE journals.logs (user text, year int, month int, day int, title text, body text, PRIMARY KEY ((user), year, month, day, title));';
        session.execute(query)

        # populate the table
        stmt = session.prepare('INSERT INTO journals.logs (user, year, month, day, title, body) VALUES (?, ?, ?, ?, ?, ?);');
        for year in range(2011, 2018):
            for month in range(1, 13):
                for day in range(1, 31):
                    session.execute(stmt, ['beobal', year, month, day, 'title', 'Lorem ipsum dolor sit amet'], ConsistencyLevel.QUORUM)
        cluster.flush()

        # make sure the data is there
        assert_all(session,
                   "SELECT COUNT(*) FROM journals.logs WHERE user = 'beobal' AND year < 2018 ORDER BY year DESC;",
                   [[7 * 12 * 30]],
                   cl=ConsistencyLevel.QUORUM)

        # take one node down
        node3.stop(wait_other_notice=True)

        # generate an sstable with an RT that opens in the penultimate block and closes in the last one
        stmt = session.prepare('DELETE FROM journals.logs WHERE user = ? AND year = ? AND month = ? AND day = ?;')
        batch = BatchStatement(batch_type=BatchType.UNLOGGED)
        for day in range(1, 31):
            batch.add(stmt, ['beobal', 2018, 1, day])
        session.execute(batch, [], ConsistencyLevel.QUORUM)
        node1.flush()
        node2.flush()

        # take node2 down, get node3 up
        node2.stop(wait_other_notice=True)
        node3.start(wait_other_notice=True)

        # insert an RT somewhere so that we would have a closing marker and RR makes its mutations
        stmt = SimpleStatement("DELETE FROM journals.logs WHERE user = 'beobal' AND year = 2010 AND month = 12 AND day = 30",
                               consistency_level=ConsistencyLevel.QUORUM)
        session.execute(stmt)

        # this read will trigger read repair with the invalid RT and propagate the wide broken RT,
        # permanently killing the partition
        stmt = SimpleStatement("SELECT * FROM journals.logs WHERE user = 'beobal' AND year < 2018 ORDER BY year DESC;",
                               consistency_level=ConsistencyLevel.QUORUM)
        session.execute(stmt)

        # everything is gone
        assert_all(session,
                   "SELECT COUNT(*) FROM journals.logs WHERE user = 'beobal';",
                   [[7 * 12 * 30]],
                   cl=ConsistencyLevel.QUORUM)

    @since('3.0')
    def test_14330(self):
        """
        @jira_ticket CASSANDRA-14330

        A regression test to prove that we no longer trigger
        AssertionError during read repair in DataResolver
        when encountering a repeat open RT bound from short
        read protection responses.
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2).start(wait_other_notice=True)
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node2)

        query = "CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2};"
        session.execute(query)

        query = 'CREATE TABLE test.test (pk int, ck int, PRIMARY KEY (pk, ck));'
        session.execute(query)

        # with all nodes up, insert an RT and 2 rows on every node
        #
        # node1 | RT[0...] 0 1
        # node2 | RT[0...] 0 1

        session.execute('DELETE FROM test.test USING TIMESTAMP 0 WHERE pk = 0 AND ck >= 0;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 0) USING TIMESTAMP 1;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 1) USING TIMESTAMP 1;')

        # with node1 down, delete row 0 on node2
        #
        # node1 | RT[0...] 0 1
        # node2 | RT[0...] x 1

        node1.stop(wait_other_notice=True)
        session.execute('DELETE FROM test.test USING TIMESTAMP 1 WHERE pk = 0 AND ck = 0;')
        node1.start(wait_other_notice=True, wait_for_binary_proto=True)

        # with both nodes up, make a LIMIT 1 read that would trigger a short read protection
        # request, which in turn will trigger the AssertionError in DataResolver (prior to
        # CASSANDRA-14330 fix)

        assert_all(session,
                   'SELECT ck FROM test.test WHERE pk = 0 LIMIT 1;',
                   [[1]],
                   cl=ConsistencyLevel.ALL)

    @since('3.0')
    def test_13911(self):
        """
        @jira_ticket CASSANDRA-13911
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2).start(wait_other_notice=True)
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node1)

        query = "CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2};"
        session.execute(query)

        query = 'CREATE TABLE test.test (pk int, ck int, PRIMARY KEY (pk, ck));'
        session.execute(query)

        # with node2 down, insert row 0 on node1
        #
        # node1, partition 0 | 0
        # node2, partition 0 |

        node2.stop(wait_other_notice=True)
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 0);')
        node2.start(wait_other_notice=True, wait_for_binary_proto=True)

        # with node1 down, delete row 1 and 2 on node2
        #
        # node1, partition 0 | 0
        # node2, partition 0 |   x x

        session = self.patient_cql_connection(node2)

        node1.stop(wait_other_notice=True)
        session.execute('DELETE FROM test.test WHERE pk = 0 AND ck IN (1, 2);')
        node1.start(wait_other_notice=True, wait_for_binary_proto=True)

        # with both nodes up, do a CL.ALL query with per partition limit of 1;
        # prior to CASSANDRA-13911 this would trigger an IllegalStateException
        assert_all(session,
                   'SELECT DISTINCT pk FROM test.test;',
                   [[0]],
                   cl=ConsistencyLevel.ALL)

    @since('3.11')
    def test_13911_rows_srp(self):
        """
        @jira_ticket CASSANDRA-13911

        A regression test to prove that we can no longer rely on
        !singleResultCounter.isDoneForPartition() to abort single
        partition SRP early if a per partition limit is set.
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2).start(wait_other_notice=True)
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node1)

        query = "CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2};"
        session.execute(query)

        query = 'CREATE TABLE test.test (pk int, ck int, PRIMARY KEY (pk, ck));'
        session.execute(query)

        # with node2 down
        #
        # node1, partition 0 | 0 1 - -
        # node1, partition 2 | 0 x - -

        node2.stop(wait_other_notice=True)
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 0) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 1) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (2, 0) USING TIMESTAMP 42;')
        session.execute('DELETE FROM test.test USING TIMESTAMP 42 WHERE pk = 2 AND ck = 1;')
        node2.start(wait_other_notice=True, wait_for_binary_proto=True)

        # with node1 down
        #
        # node2, partition 0 | - - 2 3
        # node2, partition 2 | x 1 2 -

        session = self.patient_cql_connection(node2)

        node1.stop(wait_other_notice=True)
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 2) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 3) USING TIMESTAMP 42;')
        session.execute('DELETE FROM test.test USING TIMESTAMP 42 WHERE pk = 2 AND ck = 0;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (2, 1) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (2, 2) USING TIMESTAMP 42;')
        node1.start(wait_other_notice=True, wait_for_binary_proto=True)

        # with both nodes up, do a CL.ALL query with per partition limit of 2 and limit of 3;
        # without the change to if (!singleResultCounter.isDoneForPartition()) branch,
        # the query would skip SRP on node2, partition 2, and incorrectly return just
        # [[0, 0], [0, 1]]
        assert_all(session,
                   'SELECT pk, ck FROM test.test PER PARTITION LIMIT 2 LIMIT 3;',
                   [[0, 0], [0, 1],
                    [2, 2]],
                   cl=ConsistencyLevel.ALL)

    @since('3.11')
    def test_13911_partitions_srp(self):
        """
        @jira_ticket CASSANDRA-13911

        A regression test to prove that we can't rely on
        !singleResultCounter.isDone() to abort ranged
        partition SRP early if a per partition limit is set.
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2).start(wait_other_notice=True)
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node1)

        query = "CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2};"
        session.execute(query)

        query = 'CREATE TABLE test.test (pk int, ck int, PRIMARY KEY (pk, ck));'
        session.execute(query)

        # with node2 down
        #
        # node1, partition 0 | 0 1 - -
        # node1, partition 2 | x x - -

        node2.stop(wait_other_notice=True)
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 0) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 1) USING TIMESTAMP 42;')
        session.execute('DELETE FROM test.test USING TIMESTAMP 42 WHERE pk = 2 AND ck IN  (0, 1);')
        node2.start(wait_other_notice=True, wait_for_binary_proto=True)

        # with node1 down
        #
        # node2, partition 0 | - - 2 3
        # node2, partition 2 | 0 1 - -
        # node2, partition 4 | 0 1 - -

        session = self.patient_cql_connection(node2)

        node1.stop(wait_other_notice=True)
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 2) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 3) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (2, 0) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (2, 1) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (4, 0) USING TIMESTAMP 42;')
        session.execute('INSERT INTO test.test (pk, ck) VALUES (4, 1) USING TIMESTAMP 42;')
        node1.start(wait_other_notice=True, wait_for_binary_proto=True)

        # with both nodes up, do a CL.ALL query with per partition limit of 2 and limit of 4;
        # without the extra condition in if (!singleResultCounter.isDone()) branch,
        # the query would skip partitions SRP on node2 at the end of partition 2,
        # and incorrectly return just [[0, 0], [0, 1]]
        assert_all(session,
                   'SELECT pk, ck FROM test.test PER PARTITION LIMIT 2 LIMIT 4;',
                   [[0, 0], [0, 1],
                    [4, 0], [4, 1]],
                   cl=ConsistencyLevel.ALL)

    @since('3.0')
    def test_13880(self):
        """
        @jira_ticket CASSANDRA-13880
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2).start(wait_other_notice=True)
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node1)

        query = "CREATE KEYSPACE IF NOT EXISTS test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2};"
        session.execute(query)

        query = "CREATE TABLE IF NOT EXISTS test.test (id int PRIMARY KEY);"
        session.execute(query)

        stmt = SimpleStatement("INSERT INTO test.test (id) VALUES (0);",
                               consistency_level=ConsistencyLevel.ALL)
        session.execute(stmt)

        # with node2 down and hints disabled, delete the partition on node1
        node2.stop(wait_other_notice=True)
        session.execute("DELETE FROM test.test WHERE id = 0;")
        node2.start(wait_other_notice=True)

        # with both nodes up, do a CL.ALL query with per partition limit of 1;
        # prior to CASSANDRA-13880 this would cause short read protection to loop forever
        assert_none(session, "SELECT DISTINCT id FROM test.test WHERE id = 0;", cl=ConsistencyLevel.ALL)

    @since('3.0')
    def test_13747(self):
        """
        @jira_ticket CASSANDRA-13747
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2).start(wait_other_notice=True)
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node1)

        query = "CREATE KEYSPACE IF NOT EXISTS test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2};"
        session.execute(query)

        query = "CREATE TABLE IF NOT EXISTS test.test (id int PRIMARY KEY);"
        session.execute(query)

        #
        # populate the table with 10 rows:
        #

        # -7509452495886106294 |  5
        # -4069959284402364209 |  1 x
        # -3799847372828181882 |  8
        # -3485513579396041028 |  0 x
        # -3248873570005575792 |  2
        # -2729420104000364805 |  4 x
        #  1634052884888577606 |  7
        #  2705480034054113608 |  6 x
        #  3728482343045213994 |  9
        #  9010454139840013625 |  3 x

        stmt = session.prepare("INSERT INTO test.test (id) VALUES (?);")
        for id in range(0, 10):
            session.execute(stmt, [id], ConsistencyLevel.ALL)

        # with node2 down and hints disabled, delete every other row on node1
        node2.stop(wait_other_notice=True)
        session.execute("DELETE FROM test.test WHERE id IN (1, 0, 4, 6, 3);")

        # with both nodes up, do a DISTINCT range query with CL.ALL;
        # prior to CASSANDRA-13747 this would cause an assertion in short read protection code
        node2.start(wait_other_notice=True)
        stmt = SimpleStatement("SELECT DISTINCT token(id), id FROM test.test;",
                               consistency_level=ConsistencyLevel.ALL)
        result = list(session.execute(stmt))
        assert_length_equal(result, 5)

    @since('3.0')
    def test_13595(self):
        """
        @jira_ticket CASSANDRA-13595
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2)
        node1, node2 = cluster.nodelist()
        remove_perf_disable_shared_mem(node1)  # necessary for jmx
        cluster.start(wait_other_notice=True)

        session = self.patient_cql_connection(node1)

        query = "CREATE KEYSPACE IF NOT EXISTS test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2};"
        session.execute(query)

        query = 'CREATE TABLE IF NOT EXISTS test.test (id int PRIMARY KEY);'
        session.execute(query)

        # populate the table with 10 partitions,
        # then delete a bunch of them on different nodes
        # until we get the following pattern:

        #                token | k | 1 | 2 |
        # -7509452495886106294 | 5 | n | y |
        # -4069959284402364209 | 1 | y | n |
        # -3799847372828181882 | 8 | n | y |
        # -3485513579396041028 | 0 | y | n |
        # -3248873570005575792 | 2 | n | y |
        # -2729420104000364805 | 4 | y | n |
        #  1634052884888577606 | 7 | n | y |
        #  2705480034054113608 | 6 | y | n |
        #  3728482343045213994 | 9 | n | y |
        #  9010454139840013625 | 3 | y | y |

        stmt = session.prepare('INSERT INTO test.test (id) VALUES (?);')
        for id in range(0, 10):
            session.execute(stmt, [id], ConsistencyLevel.ALL)

        # delete every other partition on node1 while node2 is down
        node2.stop(wait_other_notice=True)
        session.execute('DELETE FROM test.test WHERE id IN (5, 8, 2, 7, 9);')
        node2.start(wait_other_notice=True, wait_for_binary_proto=True)

        session = self.patient_cql_connection(node2)

        # delete every other alternate partition on node2 while node1 is down
        node1.stop(wait_other_notice=True)
        session.execute('DELETE FROM test.test WHERE id IN (1, 0, 4, 6);')
        node1.start(wait_other_notice=True, wait_for_binary_proto=True)

        session = self.patient_exclusive_cql_connection(node1)

        # until #13595 the query would incorrectly return [1]
        assert_all(session,
                   'SELECT id FROM test.test LIMIT 1;',
                   [[3]],
                   cl=ConsistencyLevel.ALL)

        srp = make_mbean('metrics', type='Table', name='ShortReadProtectionRequests', keyspace='test', scope='test')
        with JolokiaAgent(node1) as jmx:
            # 4 srp requests for node1 and 5 for node2, total of 9
            assert 9 == jmx.read_attribute(srp, 'Count')

    @since('3.0')
    def test_12872(self):
        """
        @jira_ticket CASSANDRA-12872
        """
        cluster = self.cluster

        # disable hinted handoff and set batch commit log so this doesn't interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2).start(wait_other_notice=True)
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node1)

        query = "CREATE KEYSPACE IF NOT EXISTS test WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2};"
        session.execute(query)

        query = "CREATE TABLE test.test (pk int, ck int, PRIMARY KEY (pk, ck));"
        session.execute(query)

        stmt = session.prepare("INSERT INTO test.test (pk, ck) VALUES (0, ?);")
        for ck in range(0, 4):
            session.execute(stmt, [ck], ConsistencyLevel.ALL)

        # node1 |   up | 0 1 2 3
        # node2 |   up | 0 1 2 3

        node2.stop(wait_other_notice=True)

        # node1 |   up | 0 1 2 3
        # node2 | down | 0 1 2 3

        session.execute('DELETE FROM test.test WHERE pk = 0 AND ck IN (1, 2, 3);')

        # node1 |   up | 0 x x x
        # node2 | down | 0 1 2 3

        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 5);')

        # node1 |   up | 0 x x x   5
        # node2 | down | 0 1 2 3

        node2.start(wait_other_notice=True)
        node1.stop(wait_other_notice=True)

        # node1 | down | 0 x x x   5
        # node2 |   up | 0 1 2 3

        session = self.patient_cql_connection(node2)

        session.execute('INSERT INTO test.test (pk, ck) VALUES (0, 4);')

        # node1 | down | 0 x x x   5
        # node2 |   up | 0 1 2 3 4

        node1.start(wait_other_notice=True)

        # node1 |   up | 0 x x x   5
        # node2 |   up | 0 1 2 3 4

        assert_all(session,
                   'SELECT ck FROM test.test WHERE pk = 0 LIMIT 2;',
                   [[0], [4]],
                   cl=ConsistencyLevel.ALL)

    def test_short_read(self):
        """
        @jira_ticket CASSANDRA-9460
        """
        cluster = self.cluster

        # this test causes the python driver to be extremely noisy due to
        # frequent starting and stopping of nodes. let's move the log level
        # of the driver to ERROR for this test only
        logging.getLogger("cassandra").setLevel('ERROR')

        # Disable hinted handoff and set batch commit log so this doesn't
        # interfer with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(3).start(wait_other_notice=True)
        node1, node2, node3 = cluster.nodelist()

        session = self.patient_cql_connection(node1)
        create_ks(session, 'ks', 3)

        if cluster.version() < '4.0':
            create_cf(session, 'cf', read_repair=0.0)
        else:
            create_cf(session, 'cf')

        normal_key = 'normal'
        reversed_key = 'reversed'

        # Repeat this test 10 times to make it more easy to spot a null pointer exception caused by a race, see CASSANDRA-9460
        for k in range(10):
            # insert 9 columns in two rows
            insert_columns(self, session, normal_key, 9)
            insert_columns(self, session, reversed_key, 9)

            # Delete 3 first columns (and 3 last columns, for the reversed version) with a different node dead each time
            for node, column_number_to_delete in zip(list(range(1, 4)), list(range(3))):
                self.stop_node(node)
                self.delete(node, normal_key, column_number_to_delete)
                self.delete(node, reversed_key, 8 - column_number_to_delete)
                self.restart_node(node)

            # Query 3 firsts columns in normal order
            session = self.patient_cql_connection(node1, 'ks')
            query = SimpleStatement(
                'SELECT c, v FROM cf WHERE key=\'k{}\' LIMIT 3'.format(normal_key),
                consistency_level=ConsistencyLevel.QUORUM)
            rows = list(session.execute(query))
            res = rows
            assert_length_equal(res, 3)

            # value 0, 1 and 2 have been deleted
            for i in range(1, 4):
                assert 'value{}'.format(i + 2) == res[i - 1][1]

            # Query 3 firsts columns in reverse order
            session = self.patient_cql_connection(node1, 'ks')
            query = SimpleStatement(
                'SELECT c, v FROM cf WHERE key=\'k{}\' ORDER BY c DESC LIMIT 3'.format(reversed_key),
                consistency_level=ConsistencyLevel.QUORUM)
            rows = list(session.execute(query))
            res = rows
            assert_length_equal(res, 3)

            # value 6, 7 and 8 have been deleted
            for i in range(0, 3):
                assert 'value{}'.format(5 - i) == res[i][1]

            session.execute('TRUNCATE cf')

    def test_short_read_delete(self):
        """ Test short reads ultimately leaving no columns alive [#4000] """
        cluster = self.cluster

        # Disable hinted handoff and set batch commit log so this doesn't
        # interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(2).start(wait_other_notice=True)
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node1)
        create_ks(session, 'ks', 3)
        if cluster.version() < '4.0':
            create_cf(session, 'cf', read_repair=0.0)
        else:
            create_cf(session, 'cf')

        # insert 2 columns in one row
        insert_columns(self, session, 0, 2)

        # Delete the row while first node is dead
        node1.flush()
        node1.stop(wait_other_notice=True)
        session = self.patient_cql_connection(node2, 'ks')

        query = SimpleStatement('DELETE FROM cf WHERE key=\'k0\'', consistency_level=ConsistencyLevel.ONE)
        session.execute(query)

        node1.start(wait_other_notice=True)

        # Query first column
        session = self.patient_cql_connection(node1, 'ks')

        assert_none(session, "SELECT c, v FROM cf WHERE key=\'k0\' LIMIT 1", cl=ConsistencyLevel.QUORUM)

    def test_short_read_quorum_delete(self):
        """
        @jira_ticket CASSANDRA-8933
        """
        cluster = self.cluster
        # Consider however 3 nodes A, B, C (RF=3), and following sequence of operations (all done at QUORUM):

        # Disable hinted handoff and set batch commit log so this doesn't
        # interfere with the test
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})
        cluster.set_batch_commitlog(enabled=True)

        cluster.populate(3).start(wait_other_notice=True)
        node1, node2, node3 = cluster.nodelist()

        session = self.patient_cql_connection(node1)
        create_ks(session, 'ks', 3)

        if cluster.version() < '4.0':
            session.execute("CREATE TABLE t (id int, v int, PRIMARY KEY(id, v)) WITH read_repair_chance = 0.0")
        else:
            session.execute("CREATE TABLE t (id int, v int, PRIMARY KEY(id, v))")

        # we write 1 and 2 in a partition: all nodes get it.
        session.execute(SimpleStatement("INSERT INTO t (id, v) VALUES (0, 1)", consistency_level=ConsistencyLevel.ALL))
        session.execute(SimpleStatement("INSERT INTO t (id, v) VALUES (0, 2)", consistency_level=ConsistencyLevel.ALL))

        # we delete 1: only A and C get it.
        node2.flush()
        node2.stop(wait_other_notice=True)
        session.execute(SimpleStatement("DELETE FROM t WHERE id = 0 AND v = 1", consistency_level=ConsistencyLevel.QUORUM))
        node2.start(wait_other_notice=True)

        # we delete 2: only B and C get it.
        node1.flush()
        node1.stop(wait_other_notice=True)
        session = self.patient_cql_connection(node2, 'ks')
        session.execute(SimpleStatement("DELETE FROM t WHERE id = 0 AND v = 2", consistency_level=ConsistencyLevel.QUORUM))
        node1.start(wait_other_notice=True)
        session = self.patient_cql_connection(node1, 'ks')

        # we read the first row in the partition (so with a LIMIT 1) and A and B answer first.
        node3.flush()
        node3.stop(wait_other_notice=True)
        assert_none(session, "SELECT * FROM t WHERE id = 0 LIMIT 1", cl=ConsistencyLevel.QUORUM)

    def test_readrepair(self):
        cluster = self.cluster
        cluster.set_configuration_options(values={'hinted_handoff_enabled': False})

        if not self.dtest_config.use_vnodes:
            cluster.populate(2).start()
        else:
            tokens = cluster.balanced_tokens(2)
            cluster.populate(2, tokens=tokens).start()
        node1, node2 = cluster.nodelist()

        session = self.patient_cql_connection(node1)
        create_ks(session, 'ks', 2)
        if cluster.version() < '4.0':
            create_c1c2_table(self, session, read_repair=1.0)
        else:
            create_c1c2_table(self, session)

        node2.stop(wait_other_notice=True)

        insert_c1c2(session, n=10000, consistency=ConsistencyLevel.ONE)

        node2.start(wait_for_binary_proto=True, wait_other_notice=True)

        # query everything to cause RR
        for n in range(0, 10000):
            query_c1c2(session, n, ConsistencyLevel.QUORUM)

        node1.stop(wait_other_notice=True)

        # Check node2 for all the keys that should have been repaired
        session = self.patient_cql_connection(node2, keyspace='ks')
        for n in range(0, 10000):
            query_c1c2(session, n, ConsistencyLevel.ONE)

    def test_quorum_available_during_failure(self):
        cl = ConsistencyLevel.QUORUM
        rf = 3

        logger.debug("Creating a ring")
        cluster = self.cluster
        if not self.dtest_config.use_vnodes:
            cluster.populate(3).start()
        else:
            tokens = cluster.balanced_tokens(3)
            cluster.populate(3, tokens=tokens).start()
        node1, node2, node3 = cluster.nodelist()

        logger.debug("Set to talk to node 2")
        session = self.patient_cql_connection(node2)
        create_ks(session, 'ks', rf)
        create_c1c2_table(self, session)

        logger.debug("Generating some data")
        insert_c1c2(session, n=100, consistency=cl)

        logger.debug("Taking down node1")
        node1.stop(wait_other_notice=True)

        logger.debug("Reading back data.")
        for n in range(100):
            query_c1c2(session, n, cl)

    def stop_node(self, node_number):
        to_stop = self.cluster.nodes["node%d" % node_number]
        to_stop.flush()
        to_stop.stop(wait_other_notice=True)

    def delete(self, stopped_node_number, key, column):
        next_node = self.cluster.nodes["node%d" % (((stopped_node_number + 1) % 3) + 1)]
        session = self.patient_cql_connection(next_node, 'ks')

        # delete data for normal key
        query = 'BEGIN BATCH '
        query = query + 'DELETE FROM cf WHERE key=\'k%s\' AND c=\'c%06d\'; ' % (key, column)
        query = query + 'DELETE FROM cf WHERE key=\'k%s\' AND c=\'c2\'; ' % (key,)
        query = query + 'APPLY BATCH;'
        simple_query = SimpleStatement(query, consistency_level=ConsistencyLevel.QUORUM)
        session.execute(simple_query)

    def restart_node(self, node_number):
        stopped_node = self.cluster.nodes["node%d" % node_number]
        stopped_node.start(wait_for_binary_proto=True, wait_other_notice=True)