| import uuid |
| import pytest |
| import logging |
| |
| from cassandra import ConsistencyLevel, WriteFailure, WriteTimeout |
| |
| from dtest import Tester |
| from thrift_bindings.thrift010 import ttypes as thrift_types |
| from thrift_test import get_thrift_client |
| |
| since = pytest.mark.since |
| logger = logging.getLogger(__name__) |
| |
| KEYSPACE = "foo" |
| |
| |
| # These tests use the cassandra.test.fail_writes_ks option, which was only |
| # implemented in 2.2, so we skip it before then. |
| @since('2.2') |
| class TestWriteFailures(Tester): |
| """ |
| Tests for write failures in the replicas, |
| @jira_ticket CASSANDRA-8592. |
| |
| They require CURRENT_VERSION = VERSION_4 in CassandraDaemon.Server |
| otherwise these tests will fail. |
| """ |
| @pytest.fixture(autouse=True) |
| def fixture_add_additional_log_patterns(self, fixture_dtest_setup): |
| fixture_dtest_setup.ignore_log_patterns = ( |
| "Testing write failures", # The error to simulate a write failure |
| "ERROR WRITE_FAILURE", # Logged in DEBUG mode for write failures |
| "MigrationStage" # This occurs sometimes due to node down (because of restart) |
| ) |
| |
| @pytest.fixture(scope="function", autouse=True) |
| def fixture_set_test_defauls(self, fixture_dtest_setup): |
| self.supports_v5_protocol = fixture_dtest_setup.supports_v5_protocol(fixture_dtest_setup.cluster.version()) |
| self.expected_expt = WriteFailure |
| self.protocol_version = 5 if self.supports_v5_protocol else 4 |
| self.replication_factor = 3 |
| self.consistency_level = ConsistencyLevel.ALL |
| self.failing_nodes = [1, 2] |
| |
| def _prepare_cluster(self, start_rpc=False, compact_storage=False): |
| self.cluster.populate(3) |
| |
| if start_rpc: |
| self.cluster.set_configuration_options(values={'start_rpc': True}) |
| |
| self.cluster.start() |
| self.nodes = list(self.cluster.nodes.values()) |
| |
| session = self.patient_exclusive_cql_connection(self.nodes[0], protocol_version=self.protocol_version) |
| |
| session.execute(""" |
| CREATE KEYSPACE IF NOT EXISTS %s |
| WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': '%s' } |
| """ % (KEYSPACE, self.replication_factor)) |
| session.set_keyspace(KEYSPACE) |
| |
| session.execute("CREATE TABLE IF NOT EXISTS mytable (key text PRIMARY KEY, value text) %s"%("WITH COMPACT STORAGE" if compact_storage else '')) |
| session.execute("CREATE TABLE IF NOT EXISTS countertable (key uuid PRIMARY KEY, value counter)") |
| |
| for idx in self.failing_nodes: |
| node = self.nodes[idx] |
| node.stop() |
| node.start(wait_for_binary_proto=True, jvm_args=["-Dcassandra.test.fail_writes_ks=" + KEYSPACE]) |
| |
| if idx == 0: |
| session = self.patient_exclusive_cql_connection(node, protocol_version=self.protocol_version) |
| session.set_keyspace(KEYSPACE) |
| |
| return session |
| |
| def _perform_cql_statement(self, text): |
| session = self._prepare_cluster() |
| |
| statement = session.prepare(text) |
| statement.consistency_level = self.consistency_level |
| |
| if self.expected_expt is None: |
| session.execute(statement) |
| else: |
| with pytest.raises(self.expected_expt) as cm: |
| session.execute(statement) |
| return cm._excinfo[1] |
| |
| def _assert_error_code_map_exists_with_code(self, exception, expected_code): |
| """ |
| Asserts that the given exception contains an error code map |
| where at least one node responded with some expected code. |
| This is meant for testing failure exceptions on protocol v5. |
| """ |
| assert exception is not None |
| assert exception.error_code_map is not None |
| expected_code_found = False |
| for error_code in list(exception.error_code_map.values()): |
| if error_code == expected_code: |
| expected_code_found = True |
| break |
| assert expected_code_found, "The error code map did not contain " + str(expected_code) |
| |
| @since('2.2', max_version='2.2.x') |
| def test_mutation_v2(self): |
| """ |
| A failed mutation at v2 receives a WriteTimeout |
| """ |
| self.expected_expt = WriteTimeout |
| self.protocol_version = 2 |
| self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1')") |
| |
| def test_mutation_v3(self): |
| """ |
| A failed mutation at v3 receives a WriteTimeout |
| """ |
| self.expected_expt = WriteTimeout |
| self.protocol_version = 3 |
| self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1')") |
| |
| def test_mutation_v4(self): |
| """ |
| A failed mutation at v4 receives a WriteFailure |
| """ |
| self.expected_expt = WriteFailure |
| self.protocol_version = 4 |
| self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1')") |
| |
| @since('4.0') |
| def test_mutation_v5(self): |
| """ |
| A failed mutation at v5 receives a WriteFailure with an error code map containing error code 0x0000 |
| """ |
| self.expected_expt = WriteFailure |
| self.protocol_version = 5 |
| exc = self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1')") |
| self._assert_error_code_map_exists_with_code(exc, 0x0000) |
| |
| def test_mutation_any(self): |
| """ |
| A WriteFailure is not received at consistency level ANY |
| even if all nodes fail because of hinting |
| """ |
| self.consistency_level = ConsistencyLevel.ANY |
| self.expected_expt = None |
| self.failing_nodes = [0, 1, 2] |
| self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1')") |
| |
| def test_mutation_one(self): |
| """ |
| A WriteFailure is received at consistency level ONE |
| if all nodes fail |
| """ |
| self.consistency_level = ConsistencyLevel.ONE |
| self.failing_nodes = [0, 1, 2] |
| exc = self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1')") |
| if self.supports_v5_protocol: |
| self._assert_error_code_map_exists_with_code(exc, 0x0000) |
| |
| def test_mutation_quorum(self): |
| """ |
| A WriteFailure is not received at consistency level |
| QUORUM if quorum succeeds |
| """ |
| self.consistency_level = ConsistencyLevel.QUORUM |
| self.expected_expt = None |
| self.failing_nodes = [2] |
| self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1')") |
| |
| def test_batch(self): |
| """ |
| A failed batch receives a WriteFailure |
| """ |
| exc = self._perform_cql_statement(""" |
| BEGIN BATCH |
| INSERT INTO mytable (key, value) VALUES ('key2', 'Value 2') USING TIMESTAMP 1111111111111111 |
| INSERT INTO mytable (key, value) VALUES ('key3', 'Value 3') USING TIMESTAMP 1111111111111112 |
| APPLY BATCH |
| """) |
| if self.supports_v5_protocol: |
| self._assert_error_code_map_exists_with_code(exc, 0x0000) |
| |
| def test_counter(self): |
| """ |
| A failed counter mutation receives a WriteFailure |
| """ |
| _id = str(uuid.uuid4()) |
| exc = self._perform_cql_statement(""" |
| UPDATE countertable |
| SET value = value + 1 |
| where key = {uuid} |
| """.format(uuid=_id)) |
| if self.supports_v5_protocol: |
| self._assert_error_code_map_exists_with_code(exc, 0x0000) |
| |
| def test_paxos(self): |
| """ |
| A light transaction receives a WriteFailure |
| """ |
| exc = self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1') IF NOT EXISTS") |
| if self.supports_v5_protocol: |
| self._assert_error_code_map_exists_with_code(exc, 0x0000) |
| |
| def test_paxos_any(self): |
| """ |
| A light transaction at consistency level ANY does not receive a WriteFailure |
| """ |
| self.consistency_level = ConsistencyLevel.ANY |
| self.expected_expt = None |
| self._perform_cql_statement("INSERT INTO mytable (key, value) VALUES ('key1', 'Value 1') IF NOT EXISTS") |
| |
| @since('2.0', max_version='4') |
| def test_thrift(self): |
| """ |
| A thrift client receives a TimedOutException |
| """ |
| self._prepare_cluster(start_rpc=True, compact_storage=True) |
| self.expected_expt = thrift_types.TimedOutException |
| |
| client = get_thrift_client() |
| client.transport.open() |
| client.set_keyspace(KEYSPACE) |
| |
| with pytest.raises(self.expected_expt): |
| client.insert('key1'.encode(), |
| thrift_types.ColumnParent('mytable'), |
| thrift_types.Column('value'.encode(), 'Value 1'.encode(), 0), |
| thrift_types.ConsistencyLevel.ALL) |
| |
| client.transport.close() |
