Python utils.start函数代码示例

    def test_roundrobin(self):
        use_singledc()
        keyspace = 'test_roundrobin'
        cluster, session = self._cluster_session_with_lbp(RoundRobinPolicy())
        self._wait_for_nodes_up(range(1, 4), cluster)
        create_schema(cluster, session, keyspace, replication_factor=3)
        self._insert(session, keyspace)
        self._query(session, keyspace)

        self.coordinator_stats.assert_query_count_equals(self, 1, 4)
        self.coordinator_stats.assert_query_count_equals(self, 2, 4)
        self.coordinator_stats.assert_query_count_equals(self, 3, 4)

        force_stop(3)
        self._wait_for_nodes_down([3], cluster)

        self.coordinator_stats.reset_counts()
        self._query(session, keyspace)

        self.coordinator_stats.assert_query_count_equals(self, 1, 6)
        self.coordinator_stats.assert_query_count_equals(self, 2, 6)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        decommission(1)
        start(3)
        self._wait_for_nodes_down([1], cluster)
        self._wait_for_nodes_up([3], cluster)

        self.coordinator_stats.reset_counts()
        self._query(session, keyspace)

        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 6)
        self.coordinator_stats.assert_query_count_equals(self, 3, 6)
        cluster.shutdown()

    def _test_downgrading_cl(self, keyspace, rf, accepted):
        cluster = Cluster(
            load_balancing_policy=TokenAwarePolicy(RoundRobinPolicy()),
            default_retry_policy=DowngradingConsistencyRetryPolicy(),
            protocol_version=PROTOCOL_VERSION)
        session = cluster.connect()

        create_schema(session, keyspace, replication_factor=rf)
        self._insert(session, keyspace, 1)
        self._query(session, keyspace, 1)
        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 1)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        try:
            force_stop(2)
            wait_for_down(cluster, 2)

            self._assert_writes_succeed(session, keyspace, accepted)
            self._assert_reads_succeed(session, keyspace,
                                       accepted - set([ConsistencyLevel.ANY]))
            self._assert_writes_fail(session, keyspace,
                                     SINGLE_DC_CONSISTENCY_LEVELS - accepted)
            self._assert_reads_fail(session, keyspace,
                                    SINGLE_DC_CONSISTENCY_LEVELS - accepted)
        finally:
            start(2)
            wait_for_up(cluster, 2)

    def _test_tokenaware_one_node_down(self, keyspace, rf, accepted):
        cluster = Cluster(
            load_balancing_policy=TokenAwarePolicy(RoundRobinPolicy()))
        session = cluster.connect()
        wait_for_up(cluster, 1, wait=False)
        wait_for_up(cluster, 2)

        create_schema(session, keyspace, replication_factor=rf)
        self._insert(session, keyspace, count=1)
        self._query(session, keyspace, count=1)
        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 1)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        try:
            force_stop(2)
            wait_for_down(cluster, 2)

            self._assert_writes_succeed(session, keyspace, accepted)
            self._assert_reads_succeed(session, keyspace,
                    accepted - set([ConsistencyLevel.ANY]))
            self._assert_writes_fail(session, keyspace,
                    SINGLE_DC_CONSISTENCY_LEVELS - accepted)
            self._assert_reads_fail(session, keyspace,
                    SINGLE_DC_CONSISTENCY_LEVELS - accepted)
        finally:
            start(2)
            wait_for_up(cluster, 2)

    def test_pool_with_host_down(self):
        """
        Test to ensure that cluster.connect() doesn't return prior to pools being initialized.

        This test will figure out which host our pool logic will connect to first. It then shuts that server down.
        Previouly the cluster.connect() would return prior to the pools being initialized, and the first queries would
        return a no host exception

        @since 3.7.0
        @jira_ticket PYTHON-617
        @expected_result query should complete successfully

        @test_category connection
        """

        # find the first node, we will try create connections to, shut it down.
        cluster = Cluster(protocol_version=PROTOCOL_VERSION)
        cluster.connect()
        hosts = cluster.metadata.all_hosts()
        address = hosts[0].address
        node_to_stop = int(address.split('.')[-1:][0])
        try:
            force_stop(node_to_stop)
            wait_for_down(cluster, node_to_stop)
            # Attempt a query against that node. It should complete
            cluster2 = Cluster(protocol_version=PROTOCOL_VERSION)
            session2 = cluster2.connect()
            session2.execute("SELECT * FROM system.local")
            cluster2.shutdown()
        finally:
            start(node_to_stop)
            wait_for_up(cluster, node_to_stop)
            cluster.shutdown()

    def token_aware(self, keyspace, use_prepared=False):
        use_singledc()
        cluster = Cluster(
            load_balancing_policy=TokenAwarePolicy(RoundRobinPolicy()))
        session = cluster.connect()
        wait_for_up(cluster, 1, wait=False)
        wait_for_up(cluster, 2, wait=False)
        wait_for_up(cluster, 3)

        create_schema(session, keyspace, replication_factor=1)
        self._insert(session, keyspace)
        self._query(session, keyspace, use_prepared=use_prepared)

        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 12)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        self.coordinator_stats.reset_counts()
        self._query(session, keyspace, use_prepared=use_prepared)

        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 12)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        self.coordinator_stats.reset_counts()
        force_stop(2)
        wait_for_down(cluster, 2, wait=True)

        try:
            self._query(session, keyspace, use_prepared=use_prepared)
            self.fail()
        except Unavailable as e:
            self.assertEqual(e.consistency, 1)
            self.assertEqual(e.required_replicas, 1)
            self.assertEqual(e.alive_replicas, 0)

        self.coordinator_stats.reset_counts()
        start(2)
        wait_for_up(cluster, 2, wait=True)

        self._query(session, keyspace, use_prepared=use_prepared)

        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 12)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        self.coordinator_stats.reset_counts()
        decommission(2)
        wait_for_down(cluster, 2, wait=True)

        self._query(session, keyspace, use_prepared=use_prepared)

        self.coordinator_stats.assert_query_count_equals(self, 1, 6)
        self.coordinator_stats.assert_query_count_equals(self, 2, 0)
        self.coordinator_stats.assert_query_count_equals(self, 3, 6)

    def test_pool_with_host_down(self):
        """
        Test to ensure that cluster.connect() doesn't return prior to pools being initialized.

        This test will figure out which host our pool logic will connect to first. It then shuts that server down.
        Previously the cluster.connect() would return prior to the pools being initialized, and the first queries would
        return a no host exception

        @since 3.7.0
        @jira_ticket PYTHON-617
        @expected_result query should complete successfully

        @test_category connection
        """

        # find the first node, we will try create connections to, shut it down.

        # We will be shuting down a random house, so we need a complete contact list
        all_contact_points = ["127.0.0.1", "127.0.0.2", "127.0.0.3"]

        # Connect up and find out which host will bet queries routed to to first
        cluster = Cluster(protocol_version=PROTOCOL_VERSION)
        cluster.connect(wait_for_all_pools=True)
        hosts = cluster.metadata.all_hosts()
        address = hosts[0].address
        node_to_stop = int(address.split('.')[-1:][0])
        cluster.shutdown()

        # We now register a cluster that has it's Control Connection NOT on the node that we are shutting down.
        # We do this so we don't miss the event
        contact_point = '127.0.0.{0}'.format(self.get_node_not_x(node_to_stop))
        cluster = Cluster(contact_points=[contact_point], protocol_version=PROTOCOL_VERSION)
        cluster.connect(wait_for_all_pools=True)
        try:
            force_stop(node_to_stop)
            wait_for_down(cluster, node_to_stop)
            # Attempt a query against that node. It should complete
            cluster2 = Cluster(contact_points=all_contact_points, protocol_version=PROTOCOL_VERSION)
            session2 = cluster2.connect()
            session2.execute("SELECT * FROM system.local")
        finally:
            cluster2.shutdown()
            start(node_to_stop)
            wait_for_up(cluster, node_to_stop)
            cluster.shutdown()

    def rfthree_downgradingcl(self, cluster, keyspace, roundrobin):
        session = cluster.connect(wait_for_all_pools=True)

        create_schema(cluster, session, keyspace, replication_factor=2)
        self._insert(session, keyspace, count=12)
        self._query(session, keyspace, count=12)

        if roundrobin:
            self.coordinator_stats.assert_query_count_equals(self, 1, 4)
            self.coordinator_stats.assert_query_count_equals(self, 2, 4)
            self.coordinator_stats.assert_query_count_equals(self, 3, 4)
        else:
            self.coordinator_stats.assert_query_count_equals(self, 1, 0)
            self.coordinator_stats.assert_query_count_equals(self, 2, 12)
            self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        try:
            self.coordinator_stats.reset_counts()
            force_stop(2)
            wait_for_down(cluster, 2)

            self._assert_writes_succeed(session, keyspace, SINGLE_DC_CONSISTENCY_LEVELS)

            # Test reads that expected to complete successfully
            for cl in SINGLE_DC_CONSISTENCY_LEVELS - set([ConsistencyLevel.ANY]):
                self.coordinator_stats.reset_counts()
                self._query(session, keyspace, 12, consistency_level=cl)
                if roundrobin:
                    self.coordinator_stats.assert_query_count_equals(self, 1, 6)
                    self.coordinator_stats.assert_query_count_equals(self, 2, 0)
                    self.coordinator_stats.assert_query_count_equals(self, 3, 6)
                else:
                    self.coordinator_stats.assert_query_count_equals(self, 1, 0)
                    self.coordinator_stats.assert_query_count_equals(self, 2, 0)
                    self.coordinator_stats.assert_query_count_equals(self, 3, 12)
        finally:
            start(2)
            wait_for_up(cluster, 2)

        session.cluster.shutdown()

    def test_roundrobin(self):
        use_singledc()
        keyspace = 'test_roundrobin'
        cluster = Cluster(
            load_balancing_policy=RoundRobinPolicy(),
            protocol_version=PROTOCOL_VERSION)
        session = cluster.connect()
        wait_for_up(cluster, 1, wait=False)
        wait_for_up(cluster, 2, wait=False)
        wait_for_up(cluster, 3)

        create_schema(cluster, session, keyspace, replication_factor=3)
        self._insert(session, keyspace)
        self._query(session, keyspace)

        self.coordinator_stats.assert_query_count_equals(self, 1, 4)
        self.coordinator_stats.assert_query_count_equals(self, 2, 4)
        self.coordinator_stats.assert_query_count_equals(self, 3, 4)

        force_stop(3)
        wait_for_down(cluster, 3)

        self.coordinator_stats.reset_counts()
        self._query(session, keyspace)

        self.coordinator_stats.assert_query_count_equals(self, 1, 6)
        self.coordinator_stats.assert_query_count_equals(self, 2, 6)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        decommission(1)
        start(3)
        wait_for_down(cluster, 1)
        wait_for_up(cluster, 3)

        self.coordinator_stats.reset_counts()
        self._query(session, keyspace)

        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 6)
        self.coordinator_stats.assert_query_count_equals(self, 3, 6)

    def token_aware(self, keyspace, use_prepared=False):
        use_singledc()
        cluster, session = self._cluster_session_with_lbp(TokenAwarePolicy(RoundRobinPolicy()))
        self._wait_for_nodes_up(range(1, 4), cluster)

        create_schema(cluster, session, keyspace, replication_factor=1)
        self._insert(session, keyspace)
        self._query(session, keyspace, use_prepared=use_prepared)

        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 12)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        self.coordinator_stats.reset_counts()
        self._query(session, keyspace, use_prepared=use_prepared)

        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 12)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        self.coordinator_stats.reset_counts()
        force_stop(2)
        self._wait_for_nodes_down([2], cluster)

        try:
            self._query(session, keyspace, use_prepared=use_prepared)
            self.fail()
        except Unavailable as e:
            self.assertEqual(e.consistency, 1)
            self.assertEqual(e.required_replicas, 1)
            self.assertEqual(e.alive_replicas, 0)

        self.coordinator_stats.reset_counts()
        start(2)
        self._wait_for_nodes_up([2], cluster)

        self._query(session, keyspace, use_prepared=use_prepared)

        self.coordinator_stats.assert_query_count_equals(self, 1, 0)
        self.coordinator_stats.assert_query_count_equals(self, 2, 12)
        self.coordinator_stats.assert_query_count_equals(self, 3, 0)

        self.coordinator_stats.reset_counts()
        stop(2)
        self._wait_for_nodes_down([2], cluster)

        try:
            self._query(session, keyspace, use_prepared=use_prepared)
            self.fail()
        except Unavailable:
            pass

        self.coordinator_stats.reset_counts()
        start(2)
        self._wait_for_nodes_up([2], cluster)
        decommission(2)
        self._wait_for_nodes_down([2], cluster)

        self._query(session, keyspace, use_prepared=use_prepared)

        results = set([
            self.coordinator_stats.get_query_count(1),
            self.coordinator_stats.get_query_count(3)
        ])
        self.assertEqual(results, set([0, 12]))
        self.coordinator_stats.assert_query_count_equals(self, 2, 0)

        cluster.shutdown()