In memory shard map (#505)
This commit is contained in:
Tyler Neely
GitHub
356
tests/simulation/sharded_map.cpp
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356
tests/simulation/sharded_map.cpp
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// Copyright 2022 Memgraph Ltd.
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//
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// Use of this software is governed by the Business Source License
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// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
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// License, and you may not use this file except in compliance with the Business Source License.
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//
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// As of the Change Date specified in that file, in accordance with
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// the Business Source License, use of this software will be governed
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// by the Apache License, Version 2.0, included in the file
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// licenses/APL.txt.
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#include <chrono>
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#include <deque>
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#include <iostream>
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#include <map>
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#include <optional>
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#include <set>
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#include <thread>
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#include <vector>
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#include "common/types.hpp"
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#include "coordinator/coordinator_client.hpp"
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#include "coordinator/coordinator_rsm.hpp"
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#include "io/address.hpp"
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#include "io/errors.hpp"
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#include "io/rsm/raft.hpp"
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#include "io/rsm/rsm_client.hpp"
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#include "io/rsm/shard_rsm.hpp"
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#include "io/simulator/simulator.hpp"
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#include "io/simulator/simulator_transport.hpp"
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#include "storage/v3/id_types.hpp"
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#include "storage/v3/schemas.hpp"
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#include "utils/result.hpp"
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using memgraph::coordinator::AddressAndStatus;
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using memgraph::coordinator::CompoundKey;
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using memgraph::coordinator::Coordinator;
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using memgraph::coordinator::CoordinatorClient;
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using memgraph::coordinator::CoordinatorRsm;
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using memgraph::coordinator::HlcRequest;
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using memgraph::coordinator::HlcResponse;
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using memgraph::coordinator::Shard;
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using memgraph::coordinator::ShardMap;
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using memgraph::coordinator::Shards;
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using memgraph::coordinator::Status;
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using memgraph::io::Address;
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using memgraph::io::Io;
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using memgraph::io::ResponseEnvelope;
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using memgraph::io::ResponseFuture;
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using memgraph::io::Time;
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using memgraph::io::TimedOut;
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using memgraph::io::rsm::Raft;
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using memgraph::io::rsm::ReadRequest;
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using memgraph::io::rsm::ReadResponse;
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using memgraph::io::rsm::RsmClient;
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using memgraph::io::rsm::ShardRsm;
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using memgraph::io::rsm::StorageReadRequest;
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using memgraph::io::rsm::StorageReadResponse;
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using memgraph::io::rsm::StorageWriteRequest;
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using memgraph::io::rsm::StorageWriteResponse;
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using memgraph::io::rsm::WriteRequest;
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using memgraph::io::rsm::WriteResponse;
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using memgraph::io::simulator::Simulator;
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using memgraph::io::simulator::SimulatorConfig;
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using memgraph::io::simulator::SimulatorStats;
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using memgraph::io::simulator::SimulatorTransport;
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using memgraph::storage::v3::LabelId;
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using memgraph::storage::v3::SchemaProperty;
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using memgraph::utils::BasicResult;
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using ShardClient =
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RsmClient<SimulatorTransport, StorageWriteRequest, StorageWriteResponse, StorageReadRequest, StorageReadResponse>;
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namespace {
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const std::string label_name = std::string("test_label");
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ShardMap CreateDummyShardmap(Address a_io_1, Address a_io_2, Address a_io_3, Address b_io_1, Address b_io_2,
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Address b_io_3) {
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ShardMap sm;
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// register new properties
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const std::vector<std::string> property_names = {"property_1", "property_2"};
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const auto properties = sm.AllocatePropertyIds(property_names);
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const auto property_id_1 = properties.at("property_1");
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const auto property_id_2 = properties.at("property_2");
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const auto type_1 = memgraph::common::SchemaType::INT;
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const auto type_2 = memgraph::common::SchemaType::INT;
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// register new label space
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std::vector<SchemaProperty> schema = {
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SchemaProperty{.property_id = property_id_1, .type = type_1},
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SchemaProperty{.property_id = property_id_2, .type = type_2},
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};
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bool label_success = sm.InitializeNewLabel(label_name, schema, sm.shard_map_version);
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MG_ASSERT(label_success);
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const LabelId label_id = sm.labels.at(label_name);
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auto &label_space = sm.label_spaces.at(label_id);
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Shards &shards_for_label = label_space.shards;
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// add first shard at [0, 0]
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AddressAndStatus aas1_1{.address = a_io_1, .status = Status::CONSENSUS_PARTICIPANT};
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AddressAndStatus aas1_2{.address = a_io_2, .status = Status::CONSENSUS_PARTICIPANT};
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AddressAndStatus aas1_3{.address = a_io_3, .status = Status::CONSENSUS_PARTICIPANT};
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Shard shard1 = {aas1_1, aas1_2, aas1_3};
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const auto key1 = memgraph::storage::v3::PropertyValue(0);
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const auto key2 = memgraph::storage::v3::PropertyValue(0);
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const CompoundKey compound_key_1 = {key1, key2};
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shards_for_label.emplace(compound_key_1, shard1);
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// add second shard at [12, 13]
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AddressAndStatus aas2_1{.address = b_io_1, .status = Status::CONSENSUS_PARTICIPANT};
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AddressAndStatus aas2_2{.address = b_io_2, .status = Status::CONSENSUS_PARTICIPANT};
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AddressAndStatus aas2_3{.address = b_io_3, .status = Status::CONSENSUS_PARTICIPANT};
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Shard shard2 = {aas2_1, aas2_2, aas2_3};
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auto key3 = memgraph::storage::v3::PropertyValue(12);
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auto key4 = memgraph::storage::v3::PropertyValue(13);
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CompoundKey compound_key_2 = {key3, key4};
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shards_for_label[compound_key_2] = shard2;
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return sm;
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}
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std::optional<ShardClient> DetermineShardLocation(const Shard &target_shard, const std::vector<Address> &a_addrs,
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ShardClient a_client, const std::vector<Address> &b_addrs,
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ShardClient b_client) {
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for (const auto &addr : target_shard) {
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if (addr.address == b_addrs[0]) {
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return b_client;
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}
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if (addr.address == a_addrs[0]) {
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return a_client;
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}
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}
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return {};
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}
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} // namespace
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using ConcreteCoordinatorRsm = CoordinatorRsm<SimulatorTransport>;
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using ConcreteShardRsm = Raft<SimulatorTransport, ShardRsm, StorageWriteRequest, StorageWriteResponse,
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StorageReadRequest, StorageReadResponse>;
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template <typename IoImpl>
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void RunStorageRaft(
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Raft<IoImpl, ShardRsm, StorageWriteRequest, StorageWriteResponse, StorageReadRequest, StorageReadResponse> server) {
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server.Run();
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}
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int main() {
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SimulatorConfig config{
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.drop_percent = 5,
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.perform_timeouts = true,
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.scramble_messages = true,
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.rng_seed = 0,
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.start_time = Time::min() + std::chrono::microseconds{256 * 1024},
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.abort_time = Time::min() + std::chrono::microseconds{2 * 8 * 1024 * 1024},
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};
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auto simulator = Simulator(config);
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Io<SimulatorTransport> cli_io = simulator.RegisterNew();
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// Register
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Io<SimulatorTransport> a_io_1 = simulator.RegisterNew();
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Io<SimulatorTransport> a_io_2 = simulator.RegisterNew();
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Io<SimulatorTransport> a_io_3 = simulator.RegisterNew();
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Io<SimulatorTransport> b_io_1 = simulator.RegisterNew();
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Io<SimulatorTransport> b_io_2 = simulator.RegisterNew();
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Io<SimulatorTransport> b_io_3 = simulator.RegisterNew();
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// Preconfigure coordinator with kv shard 'A' and 'B'
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auto sm1 = CreateDummyShardmap(a_io_1.GetAddress(), a_io_2.GetAddress(), a_io_3.GetAddress(), b_io_1.GetAddress(),
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b_io_2.GetAddress(), b_io_3.GetAddress());
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auto sm2 = CreateDummyShardmap(a_io_1.GetAddress(), a_io_2.GetAddress(), a_io_3.GetAddress(), b_io_1.GetAddress(),
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b_io_2.GetAddress(), b_io_3.GetAddress());
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auto sm3 = CreateDummyShardmap(a_io_1.GetAddress(), a_io_2.GetAddress(), a_io_3.GetAddress(), b_io_1.GetAddress(),
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b_io_2.GetAddress(), b_io_3.GetAddress());
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// Spin up shard A
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std::vector<Address> a_addrs = {a_io_1.GetAddress(), a_io_2.GetAddress(), a_io_3.GetAddress()};
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std::vector<Address> a_1_peers = {a_addrs[1], a_addrs[2]};
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std::vector<Address> a_2_peers = {a_addrs[0], a_addrs[2]};
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std::vector<Address> a_3_peers = {a_addrs[0], a_addrs[1]};
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ConcreteShardRsm a_1{std::move(a_io_1), a_1_peers, ShardRsm{}};
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ConcreteShardRsm a_2{std::move(a_io_2), a_2_peers, ShardRsm{}};
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ConcreteShardRsm a_3{std::move(a_io_3), a_3_peers, ShardRsm{}};
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auto a_thread_1 = std::jthread(RunStorageRaft<SimulatorTransport>, std::move(a_1));
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simulator.IncrementServerCountAndWaitForQuiescentState(a_addrs[0]);
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auto a_thread_2 = std::jthread(RunStorageRaft<SimulatorTransport>, std::move(a_2));
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simulator.IncrementServerCountAndWaitForQuiescentState(a_addrs[1]);
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auto a_thread_3 = std::jthread(RunStorageRaft<SimulatorTransport>, std::move(a_3));
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simulator.IncrementServerCountAndWaitForQuiescentState(a_addrs[2]);
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// Spin up shard B
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std::vector<Address> b_addrs = {b_io_1.GetAddress(), b_io_2.GetAddress(), b_io_3.GetAddress()};
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std::vector<Address> b_1_peers = {b_addrs[1], b_addrs[2]};
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std::vector<Address> b_2_peers = {b_addrs[0], b_addrs[2]};
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std::vector<Address> b_3_peers = {b_addrs[0], b_addrs[1]};
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ConcreteShardRsm b_1{std::move(b_io_1), b_1_peers, ShardRsm{}};
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ConcreteShardRsm b_2{std::move(b_io_2), b_2_peers, ShardRsm{}};
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ConcreteShardRsm b_3{std::move(b_io_3), b_3_peers, ShardRsm{}};
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auto b_thread_1 = std::jthread(RunStorageRaft<SimulatorTransport>, std::move(b_1));
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simulator.IncrementServerCountAndWaitForQuiescentState(b_addrs[0]);
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auto b_thread_2 = std::jthread(RunStorageRaft<SimulatorTransport>, std::move(b_2));
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simulator.IncrementServerCountAndWaitForQuiescentState(b_addrs[1]);
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auto b_thread_3 = std::jthread(RunStorageRaft<SimulatorTransport>, std::move(b_3));
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simulator.IncrementServerCountAndWaitForQuiescentState(b_addrs[2]);
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// Spin up coordinators
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Io<SimulatorTransport> c_io_1 = simulator.RegisterNew();
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Io<SimulatorTransport> c_io_2 = simulator.RegisterNew();
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Io<SimulatorTransport> c_io_3 = simulator.RegisterNew();
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std::vector<Address> c_addrs = {c_io_1.GetAddress(), c_io_2.GetAddress(), c_io_3.GetAddress()};
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std::vector<Address> c_1_peers = {c_addrs[1], c_addrs[2]};
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std::vector<Address> c_2_peers = {c_addrs[0], c_addrs[2]};
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std::vector<Address> c_3_peers = {c_addrs[0], c_addrs[1]};
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ConcreteCoordinatorRsm c_1{std::move(c_io_1), c_1_peers, Coordinator{(sm1)}};
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ConcreteCoordinatorRsm c_2{std::move(c_io_2), c_2_peers, Coordinator{(sm2)}};
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ConcreteCoordinatorRsm c_3{std::move(c_io_3), c_3_peers, Coordinator{(sm3)}};
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auto c_thread_1 = std::jthread([c_1]() mutable { c_1.Run(); });
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simulator.IncrementServerCountAndWaitForQuiescentState(c_addrs[0]);
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auto c_thread_2 = std::jthread([c_2]() mutable { c_2.Run(); });
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simulator.IncrementServerCountAndWaitForQuiescentState(c_addrs[1]);
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auto c_thread_3 = std::jthread([c_3]() mutable { c_3.Run(); });
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simulator.IncrementServerCountAndWaitForQuiescentState(c_addrs[2]);
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std::cout << "beginning test after servers have become quiescent" << std::endl;
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// Have client contact coordinator RSM for a new transaction ID and
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// also get the current shard map
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CoordinatorClient<SimulatorTransport> coordinator_client(cli_io, c_addrs[0], c_addrs);
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ShardClient shard_a_client(cli_io, a_addrs[0], a_addrs);
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ShardClient shard_b_client(cli_io, b_addrs[0], b_addrs);
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memgraph::coordinator::HlcRequest req;
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// Last ShardMap Version The query engine knows about.
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ShardMap client_shard_map;
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req.last_shard_map_version = client_shard_map.GetHlc();
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while (true) {
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// Create CompoundKey
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const auto cm_key_1 = memgraph::storage::v3::PropertyValue(3);
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const auto cm_key_2 = memgraph::storage::v3::PropertyValue(4);
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const CompoundKey compound_key = {cm_key_1, cm_key_2};
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// Look for Shard
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BasicResult<TimedOut, memgraph::coordinator::CoordinatorWriteResponses> read_res =
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coordinator_client.SendWriteRequest(req);
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if (read_res.HasError()) {
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// timeout
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continue;
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}
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auto coordinator_read_response = read_res.GetValue();
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HlcResponse hlc_response = std::get<HlcResponse>(coordinator_read_response);
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// Transaction ID to be used later...
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auto transaction_id = hlc_response.new_hlc;
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if (hlc_response.fresher_shard_map) {
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client_shard_map = hlc_response.fresher_shard_map.value();
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}
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auto target_shard = client_shard_map.GetShardForKey(label_name, compound_key);
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// Determine which shard to send the requests to. This should be a more proper client cache in the "real" version.
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auto storage_client_opt = DetermineShardLocation(target_shard, a_addrs, shard_a_client, b_addrs, shard_b_client);
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MG_ASSERT(storage_client_opt);
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auto storage_client = storage_client_opt.value();
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LabelId label_id = client_shard_map.labels.at(label_name);
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// Have client use shard map to decide which shard to communicate
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// with in order to write a new value
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// client_shard_map.
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StorageWriteRequest storage_req;
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storage_req.label_id = label_id;
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storage_req.key = compound_key;
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storage_req.value = 1000;
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storage_req.transaction_id = transaction_id;
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auto write_response_result = storage_client.SendWriteRequest(storage_req);
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if (write_response_result.HasError()) {
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// timed out
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continue;
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}
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auto write_response = write_response_result.GetValue();
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bool cas_succeeded = write_response.shard_rsm_success;
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if (!cas_succeeded) {
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continue;
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}
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// Have client use shard map to decide which shard to communicate
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// with to read that same value back
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StorageReadRequest storage_get_req;
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storage_get_req.label_id = label_id;
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storage_get_req.key = compound_key;
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storage_get_req.transaction_id = transaction_id;
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auto get_response_result = storage_client.SendReadRequest(storage_get_req);
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if (get_response_result.HasError()) {
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// timed out
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continue;
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}
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auto get_response = get_response_result.GetValue();
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auto val = get_response.value.value();
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MG_ASSERT(val == 1000);
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break;
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}
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simulator.ShutDown();
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SimulatorStats stats = simulator.Stats();
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std::cout << "total messages: " << stats.total_messages << std::endl;
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std::cout << "dropped messages: " << stats.dropped_messages << std::endl;
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std::cout << "timed out requests: " << stats.timed_out_requests << std::endl;
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std::cout << "total requests: " << stats.total_requests << std::endl;
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std::cout << "total responses: " << stats.total_responses << std::endl;
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std::cout << "simulator ticks: " << stats.simulator_ticks << std::endl;
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std::cout << "========================== SUCCESS :) ==========================" << std::endl;
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return 0;
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}
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