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This commit is contained in:
antoniofilipovic 2024-02-27 14:04:55 +01:00 committed by Antonio Filipovic
parent 3c2d6863c4
commit 9317eb216e
11 changed files with 159 additions and 207 deletions
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1
src/coordination/CMakeLists.txt
View File

@ -15,7 +15,6 @@ target_sources(mg-coordination
include/coordination/replication_instance.hpp
include/coordination/raft_state.hpp
include/coordination/rpc_errors.hpp
include/coordination/utils.hpp
include/nuraft/coordinator_log_store.hpp
include/nuraft/coordinator_state_machine.hpp

7
src/coordination/coordinator_client.cpp
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@ -70,10 +70,9 @@ void CoordinatorClient::StartFrequentCheck() {
stream.AwaitResponse();
}
// Subtle race condition:
// lock is acquired only in callback,
// but we might have changed which callback needs to be called
// (imagine case of failover where instance is promoted to MAIN)
// which means this instance will execute REPLICA callback instead of MAIN callback
// acquiring of lock needs to happen before function call, as function callback can be changed
// for instance after lock is already acquired
// (failover case when instance is promoted to MAIN)
succ_cb_(coord_instance_, instance_name);
} catch (rpc::RpcFailedException const &) {
fail_cb_(coord_instance_, instance_name);

123
src/coordination/coordinator_instance.cpp
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@ -14,7 +14,6 @@
#include "coordination/coordinator_instance.hpp"
#include "coordination/coordinator_exceptions.hpp"
#include "coordination/utils.hpp"
#include "coordination/fmt.hpp"
#include "dbms/constants.hpp"
#include "nuraft/coordinator_state_machine.hpp"
@ -39,13 +38,13 @@ CoordinatorInstance::CoordinatorInstance()
auto lock = std::unique_lock{self->coord_instance_lock_};
auto &repl_instance = self->FindReplicationInstance(repl_instance_name);
std::invoke(repl_instance.GetSuccessCallback(), self, repl_instance_name, std::move(lock));
std::invoke(repl_instance.GetSuccessCallback(), self, repl_instance);
};
client_fail_cb_ = [](CoordinatorInstance *self, std::string_view repl_instance_name) -> void {
auto lock = std::unique_lock{self->coord_instance_lock_};
auto &repl_instance = self->FindReplicationInstance(repl_instance_name);
std::invoke(repl_instance.GetFailCallback(), self, repl_instance_name, std::move(lock));
std::invoke(repl_instance.GetFailCallback(), self, repl_instance);
};
}
@ -102,17 +101,12 @@ auto CoordinatorInstance::TryFailover() -> void {
return;
}
std::string most_up_to_date_instance;
std::optional<uint64_t> latest_commit_timestamp;
std::optional<std::string> latest_epoch;
{
// for each DB in instance we get one DatabaseHistory
using DatabaseHistories = replication_coordination_glue::DatabaseHistories;
std::vector<std::pair<std::string, DatabaseHistories>> instance_database_histories;
bool success{true};
std::for_each(alive_replicas.begin(), alive_replicas.end(),
[&success, &instance_database_histories](ReplicationInstance &replica) {
std::ranges::for_each(alive_replicas, [&success, &instance_database_histories](ReplicationInstance &replica) {
if (!success) {
return;
}
@ -130,14 +124,13 @@ auto CoordinatorInstance::TryFailover() -> void {
return;
}
most_up_to_date_instance =
coordination::ChooseMostUpToDateInstance(instance_database_histories, latest_epoch, latest_commit_timestamp);
}
auto [most_up_to_date_instance, latest_epoch, latest_commit_timestamp] =
ChooseMostUpToDateInstance(instance_database_histories);
spdlog::trace("The most up to date instance is {} with epoch {} and {} latest commit timestamp",
most_up_to_date_instance, *latest_epoch, *latest_commit_timestamp);
auto &new_repl_instance = FindReplicationInstance(most_up_to_date_instance);
auto *new_main = &new_repl_instance;
auto *new_main = &FindReplicationInstance(most_up_to_date_instance);
new_main->PauseFrequentCheck();
utils::OnScopeExit scope_exit{[&new_main] { new_main->ResumeFrequentCheck(); }};
@ -278,11 +271,7 @@ auto CoordinatorInstance::RegisterReplicationInstance(CoordinatorClientConfig co
return RegisterInstanceCoordinatorStatus::SUCCESS;
}
void CoordinatorInstance::MainFailCallback(std::string_view repl_instance_name,
std::unique_lock<utils::ResourceLock> lock) {
MG_ASSERT(lock.owns_lock(), "Callback doesn't own lock");
spdlog::trace("Instance {} performing main failure callback", repl_instance_name);
auto &repl_instance = FindReplicationInstance(repl_instance_name);
void CoordinatorInstance::MainFailCallback(ReplicationInstance &repl_instance) {
repl_instance.OnFailPing();
const auto &repl_instance_uuid = repl_instance.GetMainUUID();
MG_ASSERT(repl_instance_uuid.has_value(), "Instance must have uuid set");
@ -293,13 +282,10 @@ void CoordinatorInstance::MainFailCallback(std::string_view repl_instance_name,
}
}
void CoordinatorInstance::MainSuccessCallback(std::string_view repl_instance_name,
std::unique_lock<utils::ResourceLock> lock) {
MG_ASSERT(lock.owns_lock(), "Callback doesn't own lock");
void CoordinatorInstance::MainSuccessCallback(ReplicationInstance &repl_instance) {
const auto &repl_instance_name = repl_instance.InstanceName();
spdlog::trace("Instance {} performing main successful callback", repl_instance_name);
auto &repl_instance = FindReplicationInstance(repl_instance_name);
if (repl_instance.IsAlive()) {
repl_instance.OnSuccessPing();
return;
@ -334,10 +320,8 @@ void CoordinatorInstance::MainSuccessCallback(std::string_view repl_instance_nam
}
}
void CoordinatorInstance::ReplicaSuccessCallback(std::string_view repl_instance_name,
std::unique_lock<utils::ResourceLock> lock) {
MG_ASSERT(lock.owns_lock(), "Callback doesn't own lock");
auto &repl_instance = FindReplicationInstance(repl_instance_name);
void CoordinatorInstance::ReplicaSuccessCallback(ReplicationInstance &repl_instance) {
const auto &repl_instance_name = repl_instance.InstanceName();
if (!repl_instance.IsReplica()) {
spdlog::error("Aborting replica callback since instance {} is not replica anymore", repl_instance_name);
return;
@ -355,10 +339,8 @@ void CoordinatorInstance::ReplicaSuccessCallback(std::string_view repl_instance_
repl_instance.OnSuccessPing();
}
void CoordinatorInstance::ReplicaFailCallback(std::string_view repl_instance_name,
std::unique_lock<utils::ResourceLock> lock) {
MG_ASSERT(lock.owns_lock(), "Callback doesn't own lock");
auto &repl_instance = FindReplicationInstance(repl_instance_name);
void CoordinatorInstance::ReplicaFailCallback(ReplicationInstance &repl_instance) {
const auto &repl_instance_name = repl_instance.InstanceName();
if (!repl_instance.IsReplica()) {
spdlog::error("Aborting replica fail callback since instance {} is not replica anymore", repl_instance_name);
return;
@ -406,5 +388,82 @@ auto CoordinatorInstance::GetMainUUID() const -> utils::UUID { return main_uuid_
// TODO: (andi) Add to the RAFT log.
auto CoordinatorInstance::SetMainUUID(utils::UUID new_uuid) -> void { main_uuid_ = new_uuid; }
auto CoordinatorInstance::ChooseMostUpToDateInstance(
const std::vector<std::pair<std::string, replication_coordination_glue::DatabaseHistories>>
&instance_database_histories) -> NewMainRes {
NewMainRes new_main_res;
std::for_each(
instance_database_histories.begin(), instance_database_histories.end(),
[&new_main_res](const InstanceNameDbHistories &instance_res_pair) {
const auto &[instance_name, instance_db_histories] = instance_res_pair;
// Find default db for instance and its history
auto default_db_history_data = std::ranges::find_if(
instance_db_histories, [default_db = memgraph::dbms::kDefaultDB](
const replication_coordination_glue::DatabaseHistory &db_timestamps) {
return db_timestamps.name == default_db;
});
std::ranges::for_each(
instance_db_histories,
[&instance_name = instance_name](const replication_coordination_glue::DatabaseHistory &db_history) {
spdlog::trace("Instance {}: name {}, default db {}", instance_name, db_history.name,
memgraph::dbms::kDefaultDB);
});
MG_ASSERT(default_db_history_data != instance_db_histories.end(), "No history for instance");
const auto &instance_default_db_history = default_db_history_data->history;
std::ranges::for_each(instance_default_db_history | ranges::views::reverse,
[&instance_name = instance_name](const auto &epoch_history_it) {
spdlog::trace("Instance {}: epoch {}, last_commit_timestamp: {}", instance_name,
std::get<0>(epoch_history_it), std::get<1>(epoch_history_it));
});
// get latest epoch
// get latest timestamp
if (!new_main_res.latest_epoch) {
const auto &[epoch, timestamp] = *instance_default_db_history.crbegin();
new_main_res = NewMainRes{
.most_up_to_date_instance = instance_name,
.latest_epoch = epoch,
.latest_commit_timestamp = timestamp,
};
spdlog::trace("Currently the most up to date instance is {} with epoch {} and {} latest commit timestamp",
instance_name, epoch, timestamp);
return;
}
bool found_same_point{false};
std::string last_most_up_to_date_epoch{*new_main_res.latest_epoch};
for (auto [epoch, timestamp] : ranges::reverse_view(instance_default_db_history)) {
if (*new_main_res.latest_commit_timestamp < timestamp) {
new_main_res = NewMainRes{
.most_up_to_date_instance = instance_name,
.latest_epoch = epoch,
.latest_commit_timestamp = timestamp,
};
spdlog::trace("Found the new most up to date instance {} with epoch {} and {} latest commit timestamp",
instance_name, epoch, timestamp);
}
// we found point at which they were same
if (epoch == last_most_up_to_date_epoch) {
found_same_point = true;
break;
}
}
if (!found_same_point) {
spdlog::error("Didn't find same history epoch {} for instance {} and instance {}", last_most_up_to_date_epoch,
new_main_res.most_up_to_date_instance, instance_name);
}
});
return new_main_res;
}
} // namespace memgraph::coordination
#endif

23
src/coordination/coordinator_rpc.cpp
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@ -76,9 +76,9 @@ void EnableWritingOnMainRes::Load(EnableWritingOnMainRes *self, memgraph::slk::R
memgraph::slk::Load(self, reader);
}
void EnableWritingOnMainReq::Save(EnableWritingOnMainReq const &self, memgraph::slk::Builder *builder) {}
void EnableWritingOnMainReq::Save(EnableWritingOnMainReq const & /*self*/, memgraph::slk::Builder * /*builder*/) {}
void EnableWritingOnMainReq::Load(EnableWritingOnMainReq *self, memgraph::slk::Reader *reader) {}
void EnableWritingOnMainReq::Load(EnableWritingOnMainReq * /*self*/, memgraph::slk::Reader * /*reader*/) {}
// GetInstanceUUID
void GetInstanceUUIDReq::Save(const GetInstanceUUIDReq &self, memgraph::slk::Builder *builder) {
@ -97,13 +97,14 @@ void GetInstanceUUIDRes::Load(GetInstanceUUIDRes *self, memgraph::slk::Reader *r
memgraph::slk::Load(self, reader);
}
// GetInstanceUUID
void GetDatabaseHistoriesReq::Save(const GetDatabaseHistoriesReq &self, memgraph::slk::Builder *builder) {
memgraph::slk::Save(self, builder);
// GetDatabaseHistoriesRpc
void GetDatabaseHistoriesReq::Save(const GetDatabaseHistoriesReq & /*self*/, memgraph::slk::Builder * /*builder*/) {
/* nothing to serialize */
}
void GetDatabaseHistoriesReq::Load(GetDatabaseHistoriesReq *self, memgraph::slk::Reader *reader) {
memgraph::slk::Load(self, reader);
void GetDatabaseHistoriesReq::Load(GetDatabaseHistoriesReq * /*self*/, memgraph::slk::Reader * /*reader*/) {
/* nothing to serialize */
}
void GetDatabaseHistoriesRes::Save(const GetDatabaseHistoriesRes &self, memgraph::slk::Builder *builder) {
@ -238,14 +239,6 @@ void Load(memgraph::coordination::GetInstanceUUIDRes *self, memgraph::slk::Reade
// GetInstanceTimestampsReq
void Save(const memgraph::coordination::GetDatabaseHistoriesReq & /*self*/, memgraph::slk::Builder * /*builder*/) {
/* nothing to serialize*/
}
void Load(memgraph::coordination::GetDatabaseHistoriesReq * /*self*/, memgraph::slk::Reader * /*reader*/) {
/* nothing to serialize*/
}
void Save(const memgraph::coordination::GetDatabaseHistoriesRes &self, memgraph::slk::Builder *builder) {
memgraph::slk::Save(self.database_histories, builder);
}

17
src/coordination/include/coordination/coordinator_instance.hpp
View File

@ -26,6 +26,13 @@
namespace memgraph::coordination {
struct NewMainRes {
std::string most_up_to_date_instance;
std::optional<std::string> latest_epoch;
std::optional<uint64_t> latest_commit_timestamp;
};
using InstanceNameDbHistories = std::pair<std::string, replication_coordination_glue::DatabaseHistories>;
class CoordinatorInstance {
public:
CoordinatorInstance();
@ -47,13 +54,15 @@ class CoordinatorInstance {
auto FindReplicationInstance(std::string_view replication_instance_name) -> ReplicationInstance &;
void MainFailCallback(std::string_view repl_instance_name, std::unique_lock<utils::ResourceLock> lock);
void MainFailCallback(ReplicationInstance &);
void MainSuccessCallback(std::string_view repl_instance_name, std::unique_lock<utils::ResourceLock> lock);
void MainSuccessCallback(ReplicationInstance &);
void ReplicaSuccessCallback(std::string_view repl_instance_name, std::unique_lock<utils::ResourceLock> lock);
void ReplicaSuccessCallback(ReplicationInstance &);
void ReplicaFailCallback(std::string_view repl_instance_name, std::unique_lock<utils::ResourceLock> lock);
void ReplicaFailCallback(ReplicationInstance &);
static auto ChooseMostUpToDateInstance(const std::vector<InstanceNameDbHistories> &) -> NewMainRes;
private:
HealthCheckClientCallback client_succ_cb_, client_fail_cb_;

6
src/coordination/include/coordination/coordinator_rpc.hpp
View File

@ -210,18 +210,18 @@ void Save(const memgraph::coordination::GetInstanceUUIDReq &self, memgraph::slk:
void Load(memgraph::coordination::GetInstanceUUIDReq *self, memgraph::slk::Reader *reader);
void Save(const memgraph::coordination::GetInstanceUUIDRes &self, memgraph::slk::Builder *builder);
void Load(memgraph::coordination::GetInstanceUUIDRes *self, memgraph::slk::Reader *reader);
// UnregisterReplicaRpc
void Save(memgraph::coordination::UnregisterReplicaRes const &self, memgraph::slk::Builder *builder);
void Load(memgraph::coordination::UnregisterReplicaRes *self, memgraph::slk::Reader *reader);
void Save(memgraph::coordination::UnregisterReplicaReq const &self, memgraph::slk::Builder *builder);
void Load(memgraph::coordination::UnregisterReplicaReq *self, memgraph::slk::Reader *reader);
// EnableWritingOnMainRpc
void Save(memgraph::coordination::EnableWritingOnMainRes const &self, memgraph::slk::Builder *builder);
void Load(memgraph::coordination::EnableWritingOnMainRes *self, memgraph::slk::Reader *reader);
// GetInstanceTimestampsRpc
void Save(const memgraph::coordination::GetDatabaseHistoriesReq &self, memgraph::slk::Builder *builder);
void Load(memgraph::coordination::GetDatabaseHistoriesReq *self, memgraph::slk::Reader *reader);
// GetDatabaseHistoriesRpc
void Save(const memgraph::coordination::GetDatabaseHistoriesRes &self, memgraph::slk::Builder *builder);
void Load(memgraph::coordination::GetDatabaseHistoriesRes *self, memgraph::slk::Reader *reader);

4
src/coordination/include/coordination/replication_instance.hpp
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@ -25,9 +25,9 @@
namespace memgraph::coordination {
class CoordinatorInstance;
class ReplicationInstance;
using HealthCheckInstanceCallback = void (CoordinatorInstance::*)(std::string_view,
std::unique_lock<utils::ResourceLock>);
using HealthCheckInstanceCallback = void (CoordinatorInstance::*)(ReplicationInstance &);
class ReplicationInstance {
public:

101
src/coordination/include/coordination/utils.hpp
View File

@ -1,101 +0,0 @@
// Copyright 2024 Memgraph Ltd.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
// License, and you may not use this file except in compliance with the Business Source License.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.
#pragma once
#include <optional>
#include <range/v3/view.hpp>
#include <ranges>
#include <string>
#include <unordered_map>
#include "dbms/constants.hpp"
#include "replication_coordination_glue/common.hpp"
namespace memgraph::coordination {
inline std::string ChooseMostUpToDateInstance(
const std::vector<std::pair<std::string, replication_coordination_glue::DatabaseHistories>>
&instance_database_histories,
std::optional<std::string> &latest_epoch, std::optional<uint64_t> &latest_commit_timestamp) {
std::string most_up_to_date_instance;
std::for_each(
instance_database_histories.begin(), instance_database_histories.end(),
[&latest_epoch, &latest_commit_timestamp, &most_up_to_date_instance](
const std::pair<const std::string, replication_coordination_glue::DatabaseHistories> &instance_res_pair) {
const auto &[instance_name, instance_db_histories] = instance_res_pair;
// Find default db for instance and its history
auto default_db_history_data =
std::find_if(instance_db_histories.begin(), instance_db_histories.end(),
[default_db = memgraph::dbms::kDefaultDB](
const replication_coordination_glue::DatabaseHistory &db_timestamps) {
return db_timestamps.name == default_db;
});
std::for_each(
instance_db_histories.begin(), instance_db_histories.end(),
[instance_name = instance_name](const replication_coordination_glue::DatabaseHistory &db_history) {
spdlog::trace("Instance {}: name {}, default db {}", instance_name, db_history.name,
memgraph::dbms::kDefaultDB);
});
MG_ASSERT(default_db_history_data != instance_db_histories.end(), "No history for instance");
const auto &instance_default_db_history = default_db_history_data->history;
std::for_each(instance_default_db_history.rbegin(), instance_default_db_history.rend(),
[instance_name = instance_name](const auto &instance_default_db_history_it) {
spdlog::trace("Instance {}: epoch {}, last_commit_timestamp: {}", instance_name,
std::get<1>(instance_default_db_history_it),
std::get<0>(instance_default_db_history_it));
});
// get latest epoch
// get latest timestamp
if (!latest_epoch) {
const auto it = instance_default_db_history.crbegin();
const auto &[epoch, timestamp] = *it;
latest_epoch.emplace(epoch);
latest_commit_timestamp.emplace(timestamp);
most_up_to_date_instance = instance_name;
spdlog::trace("Currently the most up to date instance is {} with epoch {} and {} latest commit timestamp",
instance_name, epoch, timestamp);
return;
}
bool found_same_point{false};
std::string last_most_up_to_date_epoch{*latest_epoch};
for (auto [epoch, timestamp] : ranges::reverse_view(instance_default_db_history)) {
if (*latest_commit_timestamp < timestamp) {
latest_commit_timestamp.emplace(timestamp);
latest_epoch.emplace(epoch);
most_up_to_date_instance = instance_name;
spdlog::trace("Found the new most up to date instance {} with epoch {} and {} latest commit timestamp",
instance_name, epoch, timestamp);
}
// we found point at which they were same
if (epoch == last_most_up_to_date_epoch) {
found_same_point = true;
break;
}
}
if (!found_same_point) {
spdlog::error("Didn't find same history epoch {} for instance {} and instance {}", last_most_up_to_date_epoch,
most_up_to_date_instance, instance_name);
}
});
return most_up_to_date_instance;
}
} // namespace memgraph::coordination

3
src/replication_handler/replication_handler.cpp
View File

@ -269,8 +269,7 @@ auto ReplicationHandler::GetRole() const -> replication_coordination_glue::Repli
auto ReplicationHandler::GetDatabasesHistories() -> replication_coordination_glue::DatabaseHistories {
replication_coordination_glue::DatabaseHistories results;
dbms_handler_.ForEach([&results](memgraph::dbms::DatabaseAccess db_acc) {
auto *storage = db_acc->storage();
auto &repl_storage_state = storage->repl_storage_state_;
auto &repl_storage_state = db_acc->storage()->repl_storage_state_;
std::vector<std::pair<std::string, uint64_t>> history =
utils::fmap([](const auto &elem) { return std::pair<std::string, uint64_t>(elem.first, elem.second); },

15
src/utils/functional.hpp
View File

@ -18,17 +18,12 @@
namespace memgraph::utils {
template <class F, class T, class R = typename std::invoke_result<F, T>::type>
auto fmap(F &&f, std::vector<T> const &v) -> std::vector<R> {
template <template <typename, typename...> class Container, typename T, typename Allocator = std::allocator<T>,
typename F, typename R = std::invoke_result_t<F, T>>
requires ranges::range<Container<T, Allocator>> &&
(!std::same_as<Container<T, Allocator>, std::string>)auto fmap(F &&f, const Container<T, Allocator> &v)
-> std::vector<R> {
return v | ranges::views::transform(std::forward<F>(f)) | ranges::to<std::vector<R>>();
}
template <class F, class T, class R = typename std::result_of<F(T)>::type, class V = std::vector<R>>
V fmap(F &&f, const std::deque<T> &v) {
V r;
r.reserve(v.size());
std::ranges::transform(v, std::back_inserter(r), std::forward<F>(f));
return r;
}
} // namespace memgraph::utils

34
tests/unit/coordination_utils.cpp
View File

@ -11,7 +11,8 @@
#include <gflags/gflags.h>
#include <gtest/gtest.h>
#include "coordination/utils.hpp"
#include "coordination/coordinator_instance.hpp"
#include "dbms/constants.hpp"
#include "replication_coordination_glue/common.hpp"
#include "utils/functional.hpp"
@ -33,8 +34,6 @@ TEST_F(CoordinationUtils, MemgraphDbHistorySimple) {
// replica 3: A(24) B(36) C(48) D(50) E(51)
std::vector<std::pair<std::string, memgraph::replication_coordination_glue::DatabaseHistories>>
instance_database_histories;
std::optional<std::string> latest_epoch;
std::optional<uint64_t> latest_commit_timestamp;
std::vector<std::pair<memgraph::utils::UUID, uint64_t>> histories;
histories.emplace_back(memgraph::utils::UUID{}, 24);
@ -63,9 +62,10 @@ TEST_F(CoordinationUtils, MemgraphDbHistorySimple) {
memgraph::replication_coordination_glue::DatabaseHistories instance_3_db_histories_{history};
instance_database_histories.emplace_back("instance_3", instance_3_db_histories_);
memgraph::coordination::CoordinatorInstance instance;
auto instance_name = memgraph::coordination::ChooseMostUpToDateInstance(instance_database_histories, latest_epoch,
latest_commit_timestamp);
auto [instance_name, latest_epoch, latest_commit_timestamp] =
instance.ChooseMostUpToDateInstance(instance_database_histories);
ASSERT_TRUE(instance_name == "instance_1" || instance_name == "instance_2" || instance_name == "instance_3");
ASSERT_TRUE(*latest_epoch == db_histories.back().first);
ASSERT_TRUE(*latest_commit_timestamp == db_histories.back().second);
@ -80,8 +80,6 @@ TEST_F(CoordinationUtils, MemgraphDbHistoryLastEpochDifferent) {
// replica 3: A(24) B(12) C(15) D(17) E(59)
std::vector<std::pair<std::string, memgraph::replication_coordination_glue::DatabaseHistories>>
instance_database_histories;
std::optional<std::string> latest_epoch;
std::optional<uint64_t> latest_commit_timestamp;
std::vector<std::pair<memgraph::utils::UUID, uint64_t>> histories;
histories.emplace_back(memgraph::utils::UUID{}, 24);
@ -118,8 +116,10 @@ TEST_F(CoordinationUtils, MemgraphDbHistoryLastEpochDifferent) {
memgraph::replication_coordination_glue::DatabaseHistories instance_3_db_histories_{history3};
instance_database_histories.emplace_back("instance_3", instance_3_db_histories_);
auto instance_name = memgraph::coordination::ChooseMostUpToDateInstance(instance_database_histories, latest_epoch,
latest_commit_timestamp);
memgraph::coordination::CoordinatorInstance instance;
auto [instance_name, latest_epoch, latest_commit_timestamp] =
instance.ChooseMostUpToDateInstance(instance_database_histories);
ASSERT_TRUE(instance_name == "instance_3");
ASSERT_TRUE(*latest_epoch == db_histories.back().first);
ASSERT_TRUE(*latest_commit_timestamp == db_histories.back().second);
@ -134,8 +134,6 @@ TEST_F(CoordinationUtils, MemgraphDbHistoryOneInstanceAheadFewEpochs) {
// replica 3: A(24) B(36) C(48) D(50) E(51) X X X up
std::vector<std::pair<std::string, memgraph::replication_coordination_glue::DatabaseHistories>>
instance_database_histories;
std::optional<std::string> latest_epoch;
std::optional<uint64_t> latest_commit_timestamp;
std::vector<std::pair<memgraph::utils::UUID, uint64_t>> histories;
histories.emplace_back(memgraph::utils::UUID{}, 24);
@ -176,8 +174,10 @@ TEST_F(CoordinationUtils, MemgraphDbHistoryOneInstanceAheadFewEpochs) {
memgraph::replication_coordination_glue::DatabaseHistories instance_3_db_histories_{history_longest};
instance_database_histories.emplace_back("instance_3", instance_3_db_histories_);
auto instance_name = memgraph::coordination::ChooseMostUpToDateInstance(instance_database_histories, latest_epoch,
latest_commit_timestamp);
memgraph::coordination::CoordinatorInstance instance;
auto [instance_name, latest_epoch, latest_commit_timestamp] =
instance.ChooseMostUpToDateInstance(instance_database_histories);
ASSERT_TRUE(instance_name == "instance_3");
ASSERT_TRUE(*latest_epoch == db_histories_longest.back().first);
ASSERT_TRUE(*latest_commit_timestamp == db_histories_longest.back().second);
@ -191,8 +191,6 @@ TEST_F(CoordinationUtils, MemgraphDbHistoryInstancesHistoryDiverged) {
// replica 3: A(1) B(2) X D(4) X up
std::vector<std::pair<std::string, memgraph::replication_coordination_glue::DatabaseHistories>>
instance_database_histories;
std::optional<std::string> latest_epoch;
std::optional<uint64_t> latest_commit_timestamp;
std::vector<std::pair<memgraph::utils::UUID, uint64_t>> histories;
histories.emplace_back(memgraph::utils::UUID{}, 1);
@ -238,8 +236,10 @@ TEST_F(CoordinationUtils, MemgraphDbHistoryInstancesHistoryDiverged) {
memgraph::replication_coordination_glue::DatabaseHistories instance_2_db_histories_{history_2};
instance_database_histories.emplace_back("instance_2", instance_2_db_histories_);
auto instance_name = memgraph::coordination::ChooseMostUpToDateInstance(instance_database_histories, latest_epoch,
latest_commit_timestamp);
memgraph::coordination::CoordinatorInstance instance;
auto [instance_name, latest_epoch, latest_commit_timestamp] =
instance.ChooseMostUpToDateInstance(instance_database_histories);
ASSERT_TRUE(instance_name == "instance_3");
ASSERT_TRUE(*latest_epoch == std::string(newest_different_epoch));
ASSERT_TRUE(*latest_commit_timestamp == oldest_commit_timestamp);