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ClusterRecovery.actor.cpp
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/*
* ClusterRecovery.actor.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2019 Apple Inc. and the FoundationDB project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "fdbrpc/sim_validation.h"
#include "fdbserver/ApplyMetadataMutation.h"
#include "fdbserver/BackupProgress.actor.h"
#include "fdbserver/ClusterRecovery.actor.h"
#include "fdbserver/MasterInterface.h"
#include "fdbserver/WaitFailure.h"
#include "flow/actorcompiler.h" // This must be the last #include.
static std::set<int> const& normalClusterRecoveryErrors() {
static std::set<int> s;
if (s.empty()) {
s.insert(error_code_operation_failed);
s.insert(error_code_tlog_stopped);
s.insert(error_code_tlog_failed);
s.insert(error_code_commit_proxy_failed);
s.insert(error_code_grv_proxy_failed);
s.insert(error_code_resolver_failed);
s.insert(error_code_backup_worker_failed);
s.insert(error_code_recruitment_failed);
s.insert(error_code_no_more_servers);
s.insert(error_code_cluster_recovery_failed);
s.insert(error_code_coordinated_state_conflict);
s.insert(error_code_master_max_versions_in_flight);
s.insert(error_code_worker_removed);
s.insert(error_code_new_coordinators_timed_out);
s.insert(error_code_broken_promise);
}
return s;
}
ACTOR Future<Void> recoveryTerminateOnConflict(UID dbgid,
Promise<Void> fullyRecovered,
Future<Void> onConflict,
Future<Void> switchedState) {
choose {
when(wait(onConflict)) {
if (!fullyRecovered.isSet()) {
TraceEvent("RecoveryTerminated", dbgid).detail("Reason", "Conflict");
TEST(true); // Coordinated state conflict, recovery terminating
throw worker_removed();
}
return Void();
}
when(wait(switchedState)) { return Void(); }
}
}
ACTOR Future<Void> recruitNewMaster(ClusterControllerData* cluster,
ClusterControllerData::DBInfo* db,
MasterInterface* newMaster) {
state Future<ErrorOr<MasterInterface>> fNewMaster;
state WorkerFitnessInfo masterWorker;
loop {
// We must recruit the master in the same data center as the cluster controller.
// This should always be possible, because we can recruit the master on the same process as the cluster
// controller.
std::map<Optional<Standalone<StringRef>>, int> id_used;
id_used[cluster->clusterControllerProcessId]++;
masterWorker = cluster->getWorkerForRoleInDatacenter(
cluster->clusterControllerDcId, ProcessClass::Master, ProcessClass::NeverAssign, db->config, id_used);
if ((masterWorker.worker.processClass.machineClassFitness(ProcessClass::Master) >
SERVER_KNOBS->EXPECTED_MASTER_FITNESS ||
masterWorker.worker.interf.locality.processId() == cluster->clusterControllerProcessId) &&
!cluster->goodRecruitmentTime.isReady()) {
TraceEvent("RecruitNewMaster", cluster->id)
.detail("Fitness", masterWorker.worker.processClass.machineClassFitness(ProcessClass::Master));
wait(delay(SERVER_KNOBS->ATTEMPT_RECRUITMENT_DELAY));
continue;
}
RecruitMasterRequest rmq;
rmq.lifetime = db->serverInfo->get().masterLifetime;
rmq.forceRecovery = db->forceRecovery;
cluster->masterProcessId = masterWorker.worker.interf.locality.processId();
cluster->db.unfinishedRecoveries++;
fNewMaster = masterWorker.worker.interf.master.tryGetReply(rmq);
wait(ready(fNewMaster) || db->forceMasterFailure.onTrigger());
if (fNewMaster.isReady() && fNewMaster.get().present()) {
TraceEvent("RecruitNewMaster", cluster->id).detail("Recruited", fNewMaster.get().get().id());
// for status tool
TraceEvent("RecruitedMasterWorker", cluster->id)
.detail("Address", fNewMaster.get().get().address())
.trackLatest(cluster->recruitedMasterWorkerEventHolder->trackingKey);
*newMaster = fNewMaster.get().get();
return Void();
} else {
TEST(true); // clusterWatchDatabase() !newMaster.present()
wait(delay(SERVER_KNOBS->MASTER_SPIN_DELAY));
}
}
}
ACTOR Future<Void> clusterRecruitFromConfiguration(ClusterControllerData* self, Reference<RecruitWorkersInfo> req) {
// At the moment this doesn't really need to be an actor (it always completes immediately)
TEST(true); // ClusterController RecruitTLogsRequest
loop {
try {
req->rep = self->findWorkersForConfiguration(req->req);
return Void();
} catch (Error& e) {
if (e.code() == error_code_no_more_servers && self->goodRecruitmentTime.isReady()) {
self->outstandingRecruitmentRequests.push_back(req);
TraceEvent(SevWarn, "RecruitFromConfigurationNotAvailable", self->id).error(e);
wait(req->waitForCompletion.onTrigger());
return Void();
} else if (e.code() == error_code_operation_failed || e.code() == error_code_no_more_servers) {
// recruitment not good enough, try again
TraceEvent("RecruitFromConfigurationRetry", self->id)
.error(e)
.detail("GoodRecruitmentTimeReady", self->goodRecruitmentTime.isReady());
while (!self->goodRecruitmentTime.isReady()) {
wait(lowPriorityDelay(SERVER_KNOBS->ATTEMPT_RECRUITMENT_DELAY));
}
} else {
TraceEvent(SevError, "RecruitFromConfigurationError", self->id).error(e);
throw;
}
}
wait(lowPriorityDelay(SERVER_KNOBS->ATTEMPT_RECRUITMENT_DELAY));
}
}
ACTOR Future<RecruitRemoteFromConfigurationReply> clusterRecruitRemoteFromConfiguration(
ClusterControllerData* self,
Reference<RecruitRemoteWorkersInfo> req) {
// At the moment this doesn't really need to be an actor (it always completes immediately)
TEST(true); // ClusterController RecruitTLogsRequest Remote
loop {
try {
auto rep = self->findRemoteWorkersForConfiguration(req->req);
return rep;
} catch (Error& e) {
if (e.code() == error_code_no_more_servers && self->goodRemoteRecruitmentTime.isReady()) {
self->outstandingRemoteRecruitmentRequests.push_back(req);
TraceEvent(SevWarn, "RecruitRemoteFromConfigurationNotAvailable", self->id).error(e);
wait(req->waitForCompletion.onTrigger());
return req->rep;
} else if (e.code() == error_code_operation_failed || e.code() == error_code_no_more_servers) {
// recruitment not good enough, try again
TraceEvent("RecruitRemoteFromConfigurationRetry", self->id)
.error(e)
.detail("GoodRecruitmentTimeReady", self->goodRemoteRecruitmentTime.isReady());
while (!self->goodRemoteRecruitmentTime.isReady()) {
wait(lowPriorityDelay(SERVER_KNOBS->ATTEMPT_RECRUITMENT_DELAY));
}
} else {
TraceEvent(SevError, "RecruitRemoteFromConfigurationError", self->id).error(e);
throw;
}
}
wait(lowPriorityDelay(SERVER_KNOBS->ATTEMPT_RECRUITMENT_DELAY));
}
}
ACTOR Future<Void> newCommitProxies(Reference<ClusterRecoveryData> self, RecruitFromConfigurationReply recr) {
std::vector<Future<CommitProxyInterface>> initializationReplies;
for (int i = 0; i < recr.commitProxies.size(); i++) {
InitializeCommitProxyRequest req;
req.master = self->masterInterface;
req.masterLifetime = self->masterLifetime;
req.recoveryCount = self->cstate.myDBState.recoveryCount + 1;
req.recoveryTransactionVersion = self->recoveryTransactionVersion;
req.firstProxy = i == 0;
TraceEvent("CommitProxyReplies", self->dbgid)
.detail("WorkerID", recr.commitProxies[i].id())
.detail("ReocoveryTxnVersion", self->recoveryTransactionVersion)
.detail("FirstProxy", req.firstProxy ? "True" : "False");
initializationReplies.push_back(
transformErrors(throwErrorOr(recr.commitProxies[i].commitProxy.getReplyUnlessFailedFor(
req, SERVER_KNOBS->TLOG_TIMEOUT, SERVER_KNOBS->MASTER_FAILURE_SLOPE_DURING_RECOVERY)),
commit_proxy_failed()));
}
std::vector<CommitProxyInterface> newRecruits = wait(getAll(initializationReplies));
// It is required for the correctness of COMMIT_ON_FIRST_PROXY that self->commitProxies[0] is the firstCommitProxy.
self->commitProxies = newRecruits;
return Void();
}
ACTOR Future<Void> newGrvProxies(Reference<ClusterRecoveryData> self, RecruitFromConfigurationReply recr) {
std::vector<Future<GrvProxyInterface>> initializationReplies;
for (int i = 0; i < recr.grvProxies.size(); i++) {
InitializeGrvProxyRequest req;
req.master = self->masterInterface;
req.masterLifetime = self->masterLifetime;
req.recoveryCount = self->cstate.myDBState.recoveryCount + 1;
TraceEvent("GrvProxyReplies", self->dbgid).detail("WorkerID", recr.grvProxies[i].id());
initializationReplies.push_back(
transformErrors(throwErrorOr(recr.grvProxies[i].grvProxy.getReplyUnlessFailedFor(
req, SERVER_KNOBS->TLOG_TIMEOUT, SERVER_KNOBS->MASTER_FAILURE_SLOPE_DURING_RECOVERY)),
grv_proxy_failed()));
}
std::vector<GrvProxyInterface> newRecruits = wait(getAll(initializationReplies));
self->grvProxies = newRecruits;
return Void();
}
ACTOR Future<Void> newResolvers(Reference<ClusterRecoveryData> self, RecruitFromConfigurationReply recr) {
std::vector<Future<ResolverInterface>> initializationReplies;
for (int i = 0; i < recr.resolvers.size(); i++) {
InitializeResolverRequest req;
req.recoveryCount = self->cstate.myDBState.recoveryCount + 1;
req.commitProxyCount = recr.commitProxies.size();
req.resolverCount = recr.resolvers.size();
TraceEvent("ResolverReplies", self->dbgid).detail("WorkerID", recr.resolvers[i].id());
initializationReplies.push_back(
transformErrors(throwErrorOr(recr.resolvers[i].resolver.getReplyUnlessFailedFor(
req, SERVER_KNOBS->TLOG_TIMEOUT, SERVER_KNOBS->MASTER_FAILURE_SLOPE_DURING_RECOVERY)),
resolver_failed()));
}
std::vector<ResolverInterface> newRecruits = wait(getAll(initializationReplies));
self->resolvers = newRecruits;
return Void();
}
ACTOR Future<Void> newTLogServers(Reference<ClusterRecoveryData> self,
RecruitFromConfigurationReply recr,
Reference<ILogSystem> oldLogSystem,
std::vector<Standalone<CommitTransactionRef>>* initialConfChanges) {
if (self->configuration.usableRegions > 1) {
state Optional<Key> remoteDcId = self->remoteDcIds.size() ? self->remoteDcIds[0] : Optional<Key>();
if (!self->dcId_locality.count(recr.dcId)) {
int8_t loc = self->getNextLocality();
Standalone<CommitTransactionRef> tr;
tr.set(tr.arena(), tagLocalityListKeyFor(recr.dcId), tagLocalityListValue(loc));
initialConfChanges->push_back(tr);
self->dcId_locality[recr.dcId] = loc;
TraceEvent(SevWarn, "UnknownPrimaryDCID", self->dbgid).detail("PrimaryId", recr.dcId).detail("Loc", loc);
}
if (!self->dcId_locality.count(remoteDcId)) {
int8_t loc = self->getNextLocality();
Standalone<CommitTransactionRef> tr;
tr.set(tr.arena(), tagLocalityListKeyFor(remoteDcId), tagLocalityListValue(loc));
initialConfChanges->push_back(tr);
self->dcId_locality[remoteDcId] = loc;
TraceEvent(SevWarn, "UnknownRemoteDCID", self->dbgid).detail("RemoteId", remoteDcId).detail("Loc", loc);
}
std::vector<UID> exclusionWorkerIds;
std::transform(recr.tLogs.begin(),
recr.tLogs.end(),
std::back_inserter(exclusionWorkerIds),
[](const WorkerInterface& in) { return in.id(); });
std::transform(recr.satelliteTLogs.begin(),
recr.satelliteTLogs.end(),
std::back_inserter(exclusionWorkerIds),
[](const WorkerInterface& in) { return in.id(); });
RecruitRemoteFromConfigurationRequest remoteRecruitReq(
self->configuration,
remoteDcId,
recr.tLogs.size() *
std::max<int>(1, self->configuration.desiredLogRouterCount / std::max<int>(1, recr.tLogs.size())),
exclusionWorkerIds);
remoteRecruitReq.dbgId = self->dbgid;
state Reference<RecruitRemoteWorkersInfo> recruitWorkersInfo =
makeReference<RecruitRemoteWorkersInfo>(remoteRecruitReq);
recruitWorkersInfo->dbgId = self->dbgid;
Future<RecruitRemoteFromConfigurationReply> fRemoteWorkers =
clusterRecruitRemoteFromConfiguration(self->controllerData, recruitWorkersInfo);
self->primaryLocality = self->dcId_locality[recr.dcId];
self->logSystem = Reference<ILogSystem>(); // Cancels the actors in the previous log system.
Reference<ILogSystem> newLogSystem = wait(oldLogSystem->newEpoch(recr,
fRemoteWorkers,
self->clusterId,
self->configuration,
self->cstate.myDBState.recoveryCount + 1,
self->primaryLocality,
self->dcId_locality[remoteDcId],
self->allTags,
self->recruitmentStalled));
self->logSystem = newLogSystem;
} else {
self->primaryLocality = tagLocalitySpecial;
self->logSystem = Reference<ILogSystem>(); // Cancels the actors in the previous log system.
Reference<ILogSystem> newLogSystem = wait(oldLogSystem->newEpoch(recr,
Never(),
self->clusterId,
self->configuration,
self->cstate.myDBState.recoveryCount + 1,
self->primaryLocality,
tagLocalitySpecial,
self->allTags,
self->recruitmentStalled));
self->logSystem = newLogSystem;
}
return Void();
}
ACTOR Future<Void> newSeedServers(Reference<ClusterRecoveryData> self,
RecruitFromConfigurationReply recruits,
std::vector<StorageServerInterface>* servers) {
// This is only necessary if the database is at version 0
servers->clear();
if (self->lastEpochEnd)
return Void();
state int idx = 0;
state std::map<Optional<Value>, Tag> dcId_tags;
state int8_t nextLocality = 0;
while (idx < recruits.storageServers.size()) {
TraceEvent(getRecoveryEventName(ClusterRecoveryEventType::CLUSTER_RECOVERY_SS_RECRUITMENT_EVENT_NAME).c_str(),
self->dbgid)
.detail("CandidateWorker", recruits.storageServers[idx].locality.toString());
InitializeStorageRequest isr;
isr.seedTag = dcId_tags.count(recruits.storageServers[idx].locality.dcId())
? dcId_tags[recruits.storageServers[idx].locality.dcId()]
: Tag(nextLocality, 0);
isr.storeType = self->configuration.storageServerStoreType;
isr.reqId = deterministicRandom()->randomUniqueID();
isr.interfaceId = deterministicRandom()->randomUniqueID();
isr.clusterId = self->clusterId;
ErrorOr<InitializeStorageReply> newServer = wait(recruits.storageServers[idx].storage.tryGetReply(isr));
if (newServer.isError()) {
if (!newServer.isError(error_code_recruitment_failed) &&
!newServer.isError(error_code_request_maybe_delivered))
throw newServer.getError();
TEST(true); // initial storage recuitment loop failed to get new server
wait(delay(SERVER_KNOBS->STORAGE_RECRUITMENT_DELAY));
} else {
if (!dcId_tags.count(recruits.storageServers[idx].locality.dcId())) {
dcId_tags[recruits.storageServers[idx].locality.dcId()] = Tag(nextLocality, 0);
nextLocality++;
}
Tag& tag = dcId_tags[recruits.storageServers[idx].locality.dcId()];
tag.id++;
idx++;
servers->push_back(newServer.get().interf);
}
}
self->dcId_locality.clear();
for (auto& it : dcId_tags) {
self->dcId_locality[it.first] = it.second.locality;
}
TraceEvent("ClusterRecoveryRecruitedInitialStorageServers", self->dbgid)
.detail("TargetCount", self->configuration.storageTeamSize)
.detail("Servers", describe(*servers));
return Void();
}
Future<Void> waitCommitProxyFailure(std::vector<CommitProxyInterface> const& commitProxies) {
std::vector<Future<Void>> failed;
failed.reserve(commitProxies.size());
for (auto commitProxy : commitProxies) {
failed.push_back(waitFailureClient(commitProxy.waitFailure,
SERVER_KNOBS->TLOG_TIMEOUT,
-SERVER_KNOBS->TLOG_TIMEOUT / SERVER_KNOBS->SECONDS_BEFORE_NO_FAILURE_DELAY,
/*trace=*/true));
}
ASSERT(failed.size() >= 1);
return tagError<Void>(quorum(failed, 1), commit_proxy_failed());
}
Future<Void> waitGrvProxyFailure(std::vector<GrvProxyInterface> const& grvProxies) {
std::vector<Future<Void>> failed;
failed.reserve(grvProxies.size());
for (int i = 0; i < grvProxies.size(); i++)
failed.push_back(waitFailureClient(grvProxies[i].waitFailure,
SERVER_KNOBS->TLOG_TIMEOUT,
-SERVER_KNOBS->TLOG_TIMEOUT / SERVER_KNOBS->SECONDS_BEFORE_NO_FAILURE_DELAY,
/*trace=*/true));
ASSERT(failed.size() >= 1);
return tagError<Void>(quorum(failed, 1), grv_proxy_failed());
}
Future<Void> waitResolverFailure(std::vector<ResolverInterface> const& resolvers) {
std::vector<Future<Void>> failed;
failed.reserve(resolvers.size());
for (auto resolver : resolvers) {
failed.push_back(waitFailureClient(resolver.waitFailure,
SERVER_KNOBS->TLOG_TIMEOUT,
-SERVER_KNOBS->TLOG_TIMEOUT / SERVER_KNOBS->SECONDS_BEFORE_NO_FAILURE_DELAY,
/*trace=*/true));
}
ASSERT(failed.size() >= 1);
return tagError<Void>(quorum(failed, 1), resolver_failed());
}
ACTOR Future<Void> rejoinRequestHandler(Reference<ClusterRecoveryData> self) {
loop {
TLogRejoinRequest req = waitNext(self->clusterController.tlogRejoin.getFuture());
TraceEvent(SevDebug, "TLogRejoinRequestHandler")
.detail("MasterLifeTime", self->dbInfo->get().masterLifetime.toString());
req.reply.send(true);
}
}
// Keeps the coordinated state (cstate) updated as the set of recruited tlogs change through recovery.
ACTOR Future<Void> trackTlogRecovery(Reference<ClusterRecoveryData> self,
Reference<AsyncVar<Reference<ILogSystem>>> oldLogSystems,
Future<Void> minRecoveryDuration) {
state Future<Void> rejoinRequests = Never();
state DBRecoveryCount recoverCount = self->cstate.myDBState.recoveryCount + 1;
state DatabaseConfiguration configuration =
self->configuration; // self-configuration can be changed by configurationMonitor so we need a copy
loop {
state DBCoreState newState;
self->logSystem->toCoreState(newState);
newState.recoveryCount = recoverCount;
state Future<Void> changed = self->logSystem->onCoreStateChanged();
ASSERT(newState.tLogs[0].tLogWriteAntiQuorum == configuration.tLogWriteAntiQuorum &&
newState.tLogs[0].tLogReplicationFactor == configuration.tLogReplicationFactor);
state bool allLogs =
newState.tLogs.size() ==
configuration.expectedLogSets(self->primaryDcId.size() ? self->primaryDcId[0] : Optional<Key>());
state bool finalUpdate = !newState.oldTLogData.size() && allLogs;
TraceEvent("TrackTlogRecovery")
.detail("FinalUpdate", finalUpdate)
.detail("NewState.tlogs", newState.tLogs.size())
.detail("NewState.OldTLogs", newState.oldTLogData.size())
.detail("Expected.tlogs",
configuration.expectedLogSets(self->primaryDcId.size() ? self->primaryDcId[0] : Optional<Key>()));
wait(self->cstate.write(newState, finalUpdate));
if (self->cstateUpdated.canBeSet()) {
self->cstateUpdated.send(Void());
}
wait(minRecoveryDuration);
self->logSystem->coreStateWritten(newState);
if (self->recoveryReadyForCommits.canBeSet()) {
self->recoveryReadyForCommits.send(Void());
}
if (finalUpdate) {
self->recoveryState = RecoveryState::FULLY_RECOVERED;
TraceEvent(getRecoveryEventName(ClusterRecoveryEventType::CLUSTER_RECOVERY_STATE_EVENT_NAME).c_str(),
self->dbgid)
.detail("StatusCode", RecoveryStatus::fully_recovered)
.detail("Status", RecoveryStatus::names[RecoveryStatus::fully_recovered])
.detail("FullyRecoveredAtVersion", self->version)
.detail("ClusterId", self->clusterId)
.trackLatest(self->clusterRecoveryStateEventHolder->trackingKey);
TraceEvent(getRecoveryEventName(ClusterRecoveryEventType::CLUSTER_RECOVERY_GENERATION_EVENT_NAME).c_str(),
self->dbgid)
.detail("ActiveGenerations", 1)
.trackLatest(self->clusterRecoveryGenerationsEventHolder->trackingKey);
} else if (!newState.oldTLogData.size() && self->recoveryState < RecoveryState::STORAGE_RECOVERED) {
self->recoveryState = RecoveryState::STORAGE_RECOVERED;
TraceEvent(getRecoveryEventName(ClusterRecoveryEventType::CLUSTER_RECOVERY_STATE_EVENT_NAME).c_str(),
self->dbgid)
.detail("StatusCode", RecoveryStatus::storage_recovered)
.detail("Status", RecoveryStatus::names[RecoveryStatus::storage_recovered])
.trackLatest(self->clusterRecoveryStateEventHolder->trackingKey);
} else if (allLogs && self->recoveryState < RecoveryState::ALL_LOGS_RECRUITED) {
self->recoveryState = RecoveryState::ALL_LOGS_RECRUITED;
TraceEvent(getRecoveryEventName(ClusterRecoveryEventType::CLUSTER_RECOVERY_STATE_EVENT_NAME).c_str(),
self->dbgid)
.detail("StatusCode", RecoveryStatus::all_logs_recruited)
.detail("Status", RecoveryStatus::names[RecoveryStatus::all_logs_recruited])
.trackLatest(self->clusterRecoveryStateEventHolder->trackingKey);
}
if (newState.oldTLogData.size() && configuration.repopulateRegionAntiQuorum > 0 &&
self->logSystem->remoteStorageRecovered()) {
TraceEvent(SevWarnAlways, "RecruitmentStalled_RemoteStorageRecovered", self->dbgid).log();
self->recruitmentStalled->set(true);
}
self->registrationTrigger.trigger();
if (finalUpdate) {
oldLogSystems->get()->stopRejoins();
rejoinRequests = rejoinRequestHandler(self);
return Void();
}
wait(changed);
}
}
std::pair<KeyRangeRef, bool> findRange(CoalescedKeyRangeMap<int>& key_resolver,
Standalone<VectorRef<ResolverMoveRef>>& movedRanges,
int src,
int dest) {
auto ranges = key_resolver.ranges();
auto prev = ranges.begin();
auto it = ranges.begin();
++it;
if (it == ranges.end()) {
if (ranges.begin().value() != src ||
std::find(movedRanges.begin(), movedRanges.end(), ResolverMoveRef(ranges.begin()->range(), dest)) !=
movedRanges.end())
throw operation_failed();
return std::make_pair(ranges.begin().range(), true);
}
std::set<int> borders;
// If possible expand an existing boundary between the two resolvers
for (; it != ranges.end(); ++it) {
if (it->value() == src && prev->value() == dest &&
std::find(movedRanges.begin(), movedRanges.end(), ResolverMoveRef(it->range(), dest)) ==
movedRanges.end()) {
return std::make_pair(it->range(), true);
}
if (it->value() == dest && prev->value() == src &&
std::find(movedRanges.begin(), movedRanges.end(), ResolverMoveRef(prev->range(), dest)) ==
movedRanges.end()) {
return std::make_pair(prev->range(), false);
}
if (it->value() == dest)
borders.insert(prev->value());
if (prev->value() == dest)
borders.insert(it->value());
++prev;
}
prev = ranges.begin();
it = ranges.begin();
++it;
// If possible create a new boundry which doesn't exist yet
for (; it != ranges.end(); ++it) {
if (it->value() == src && !borders.count(prev->value()) &&
std::find(movedRanges.begin(), movedRanges.end(), ResolverMoveRef(it->range(), dest)) ==
movedRanges.end()) {
return std::make_pair(it->range(), true);
}
if (prev->value() == src && !borders.count(it->value()) &&
std::find(movedRanges.begin(), movedRanges.end(), ResolverMoveRef(prev->range(), dest)) ==
movedRanges.end()) {
return std::make_pair(prev->range(), false);
}
++prev;
}
it = ranges.begin();
for (; it != ranges.end(); ++it) {
if (it->value() == src &&
std::find(movedRanges.begin(), movedRanges.end(), ResolverMoveRef(it->range(), dest)) ==
movedRanges.end()) {
return std::make_pair(it->range(), true);
}
}
throw operation_failed(); // we are already attempting to move all of the data one resolver is assigned, so do not
// move anything
}
ACTOR Future<Void> resolutionBalancing(Reference<ClusterRecoveryData> self) {
state CoalescedKeyRangeMap<int> key_resolver;
key_resolver.insert(allKeys, 0);
loop {
wait(delay(SERVER_KNOBS->MIN_BALANCE_TIME, TaskPriority::ResolutionMetrics));
while (self->resolverChanges.get().size())
wait(self->resolverChanges.onChange());
state std::vector<Future<ResolutionMetricsReply>> futures;
for (auto& p : self->resolvers)
futures.push_back(
brokenPromiseToNever(p.metrics.getReply(ResolutionMetricsRequest(), TaskPriority::ResolutionMetrics)));
wait(waitForAll(futures));
state IndexedSet<std::pair<int64_t, int>, NoMetric> metrics;
int64_t total = 0;
for (int i = 0; i < futures.size(); i++) {
total += futures[i].get().value;
metrics.insert(std::make_pair(futures[i].get().value, i), NoMetric());
//TraceEvent("ResolverMetric").detail("I", i).detail("Metric", futures[i].get());
}
if (metrics.lastItem()->first - metrics.begin()->first > SERVER_KNOBS->MIN_BALANCE_DIFFERENCE) {
try {
state int src = metrics.lastItem()->second;
state int dest = metrics.begin()->second;
state int64_t amount = std::min(metrics.lastItem()->first - total / self->resolvers.size(),
total / self->resolvers.size() - metrics.begin()->first) /
2;
state Standalone<VectorRef<ResolverMoveRef>> movedRanges;
loop {
state std::pair<KeyRangeRef, bool> range = findRange(key_resolver, movedRanges, src, dest);
ResolutionSplitRequest req;
req.front = range.second;
req.offset = amount;
req.range = range.first;
ResolutionSplitReply split =
wait(brokenPromiseToNever(self->resolvers[metrics.lastItem()->second].split.getReply(
req, TaskPriority::ResolutionMetrics)));
KeyRangeRef moveRange = range.second ? KeyRangeRef(range.first.begin, split.key)
: KeyRangeRef(split.key, range.first.end);
movedRanges.push_back_deep(movedRanges.arena(), ResolverMoveRef(moveRange, dest));
TraceEvent("MovingResolutionRange")
.detail("Src", src)
.detail("Dest", dest)
.detail("Amount", amount)
.detail("StartRange", range.first)
.detail("MoveRange", moveRange)
.detail("Used", split.used)
.detail("KeyResolverRanges", key_resolver.size());
amount -= split.used;
if (moveRange != range.first || amount <= 0)
break;
}
for (auto& it : movedRanges)
key_resolver.insert(it.range, it.dest);
// for(auto& it : key_resolver.ranges())
// TraceEvent("KeyResolver").detail("Range", it.range()).detail("Value", it.value());
self->resolverChangesVersion = self->version + 1;
for (auto& p : self->commitProxies)
self->resolverNeedingChanges.insert(p.id());
self->resolverChanges.set(movedRanges);
} catch (Error& e) {
if (e.code() != error_code_operation_failed)
throw;
}
}
}
}
ACTOR Future<Void> changeCoordinators(Reference<ClusterRecoveryData> self) {
loop {
ChangeCoordinatorsRequest req = waitNext(self->clusterController.changeCoordinators.getFuture());
TraceEvent("ChangeCoordinators", self->dbgid).log();
++self->changeCoordinatorsRequests;
state ChangeCoordinatorsRequest changeCoordinatorsRequest = req;
// Kill cluster controller to facilitate coordinator registration update
if (self->controllerData->shouldCommitSuicide) {
throw restart_cluster_controller();
}
self->controllerData->shouldCommitSuicide = true;
while (!self->cstate.previousWrite.isReady()) {
wait(self->cstate.previousWrite);
wait(delay(
0)); // if a new core state is ready to be written, have that take priority over our finalizing write;
}
if (!self->cstate.fullyRecovered.isSet()) {
wait(self->cstate.write(self->cstate.myDBState, true));
}
try {
wait(self->cstate.move(ClusterConnectionString(changeCoordinatorsRequest.newConnectionString.toString())));
} catch (Error& e) {
if (e.code() != error_code_actor_cancelled)
changeCoordinatorsRequest.reply.sendError(e);
throw;
}
throw internal_error();
}
}
ACTOR Future<Void> configurationMonitor(Reference<ClusterRecoveryData> self, Database cx) {
loop {
state ReadYourWritesTransaction tr(cx);
loop {
try {
tr.setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
RangeResult results = wait(tr.getRange(configKeys, CLIENT_KNOBS->TOO_MANY));
ASSERT(!results.more && results.size() < CLIENT_KNOBS->TOO_MANY);
DatabaseConfiguration conf;
conf.fromKeyValues((VectorRef<KeyValueRef>)results);
TraceEvent("ConfigurationMonitor", self->dbgid)
.detail(getRecoveryEventName(ClusterRecoveryEventType::CLUSTER_RECOVERY_STATE_EVENT_NAME).c_str(),
self->recoveryState);
if (conf != self->configuration) {
if (self->recoveryState != RecoveryState::ALL_LOGS_RECRUITED &&
self->recoveryState != RecoveryState::FULLY_RECOVERED) {
self->controllerData->shouldCommitSuicide = true;
throw restart_cluster_controller();
}
self->configuration = conf;
self->registrationTrigger.trigger();
}
state Future<Void> watchFuture =
tr.watch(moveKeysLockOwnerKey) || tr.watch(excludedServersVersionKey) ||
tr.watch(failedServersVersionKey) || tr.watch(excludedLocalityVersionKey) ||
tr.watch(failedLocalityVersionKey);
wait(tr.commit());
wait(watchFuture);
break;
} catch (Error& e) {
wait(tr.onError(e));
}
}
}
}
ACTOR static Future<Optional<Version>> getMinBackupVersion(Reference<ClusterRecoveryData> self, Database cx) {
loop {
state ReadYourWritesTransaction tr(cx);
try {
tr.setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
tr.setOption(FDBTransactionOptions::LOCK_AWARE);
Optional<Value> value = wait(tr.get(backupStartedKey));
Optional<Version> minVersion;
if (value.present()) {
auto uidVersions = decodeBackupStartedValue(value.get());
TraceEvent e("GotBackupStartKey", self->dbgid);
int i = 1;
for (auto [uid, version] : uidVersions) {
e.detail(format("BackupID%d", i), uid).detail(format("Version%d", i), version);
i++;
minVersion = minVersion.present() ? std::min(version, minVersion.get()) : version;
}
} else {
TraceEvent("EmptyBackupStartKey", self->dbgid).log();
}
return minVersion;
} catch (Error& e) {
wait(tr.onError(e));
}
}
}
ACTOR static Future<Void> recruitBackupWorkers(Reference<ClusterRecoveryData> self, Database cx) {
ASSERT(self->backupWorkers.size() > 0);
// Avoid race between a backup worker's save progress and the reads below.
wait(delay(SERVER_KNOBS->SECONDS_BEFORE_RECRUIT_BACKUP_WORKER));
state LogEpoch epoch = self->cstate.myDBState.recoveryCount;
state Reference<BackupProgress> backupProgress(
new BackupProgress(self->dbgid, self->logSystem->getOldEpochTagsVersionsInfo()));
state Future<Void> gotProgress = getBackupProgress(cx, self->dbgid, backupProgress, /*logging=*/true);
state std::vector<Future<InitializeBackupReply>> initializationReplies;
state std::vector<std::pair<UID, Tag>> idsTags; // worker IDs and tags for current epoch
state int logRouterTags = self->logSystem->getLogRouterTags();
idsTags.reserve(logRouterTags);
for (int i = 0; i < logRouterTags; i++) {
idsTags.emplace_back(deterministicRandom()->randomUniqueID(), Tag(tagLocalityLogRouter, i));
}
const Version startVersion = self->logSystem->getBackupStartVersion();
state int i = 0;
for (; i < logRouterTags; i++) {
const auto& worker = self->backupWorkers[i % self->backupWorkers.size()];
InitializeBackupRequest req(idsTags[i].first);
req.recruitedEpoch = epoch;
req.backupEpoch = epoch;
req.routerTag = idsTags[i].second;
req.totalTags = logRouterTags;
req.startVersion = startVersion;
TraceEvent("BackupRecruitment", self->dbgid)
.detail("RequestID", req.reqId)
.detail("Tag", req.routerTag.toString())
.detail("Epoch", epoch)
.detail("BackupEpoch", epoch)
.detail("StartVersion", req.startVersion);
initializationReplies.push_back(
transformErrors(throwErrorOr(worker.backup.getReplyUnlessFailedFor(
req, SERVER_KNOBS->BACKUP_TIMEOUT, SERVER_KNOBS->MASTER_FAILURE_SLOPE_DURING_RECOVERY)),
backup_worker_failed()));
}
state Future<Optional<Version>> fMinVersion = getMinBackupVersion(self, cx);
wait(gotProgress && success(fMinVersion));
TraceEvent("MinBackupVersion", self->dbgid).detail("Version", fMinVersion.get().present() ? fMinVersion.get() : -1);
std::map<std::tuple<LogEpoch, Version, int>, std::map<Tag, Version>> toRecruit =
backupProgress->getUnfinishedBackup();
for (const auto& [epochVersionTags, tagVersions] : toRecruit) {
const Version oldEpochEnd = std::get<1>(epochVersionTags);
if (!fMinVersion.get().present() || fMinVersion.get().get() + 1 >= oldEpochEnd) {
TraceEvent("SkipBackupRecruitment", self->dbgid)
.detail("MinVersion", fMinVersion.get().present() ? fMinVersion.get() : -1)
.detail("Epoch", epoch)
.detail("OldEpoch", std::get<0>(epochVersionTags))
.detail("OldEpochEnd", oldEpochEnd);
continue;
}
for (const auto& [tag, version] : tagVersions) {
const auto& worker = self->backupWorkers[i % self->backupWorkers.size()];
i++;
InitializeBackupRequest req(deterministicRandom()->randomUniqueID());
req.recruitedEpoch = epoch;
req.backupEpoch = std::get<0>(epochVersionTags);
req.routerTag = tag;
req.totalTags = std::get<2>(epochVersionTags);
req.startVersion = version; // savedVersion + 1
req.endVersion = std::get<1>(epochVersionTags) - 1;
TraceEvent("BackupRecruitment", self->dbgid)
.detail("RequestID", req.reqId)
.detail("Tag", req.routerTag.toString())
.detail("Epoch", epoch)
.detail("BackupEpoch", req.backupEpoch)
.detail("StartVersion", req.startVersion)
.detail("EndVersion", req.endVersion.get());
initializationReplies.push_back(transformErrors(
throwErrorOr(worker.backup.getReplyUnlessFailedFor(
req, SERVER_KNOBS->BACKUP_TIMEOUT, SERVER_KNOBS->MASTER_FAILURE_SLOPE_DURING_RECOVERY)),
backup_worker_failed()));
}
}
std::vector<InitializeBackupReply> newRecruits = wait(getAll(initializationReplies));
self->logSystem->setBackupWorkers(newRecruits);
TraceEvent("BackupRecruitmentDone", self->dbgid).log();
self->registrationTrigger.trigger();
return Void();
}
ACTOR Future<Void> updateLogsValue(Reference<ClusterRecoveryData> self, Database cx) {
state Transaction tr(cx);
loop {
try {
Optional<Standalone<StringRef>> value = wait(tr.get(logsKey));
ASSERT(value.present());
auto logs = decodeLogsValue(value.get());
std::set<UID> logIds;
for (auto& log : logs.first) {
logIds.insert(log.first);
}
bool found = false;
for (auto& logSet : self->logSystem->getLogSystemConfig().tLogs) {
for (auto& log : logSet.tLogs) {
if (logIds.count(log.id())) {
found = true;
break;
}
}
if (found) {
break;
}
}
if (!found) {
TEST(true); // old master attempted to change logsKey
return Void();
}
tr.set(logsKey, self->logSystem->getLogsValue());
wait(tr.commit());
return Void();
} catch (Error& e) {
wait(tr.onError(e));
}
}
}
// TODO(ahusain): ClusterController orchestrating recovery, self message can be avoided.
Future<Void> sendMasterRegistration(ClusterRecoveryData* self,
LogSystemConfig const& logSystemConfig,
std::vector<CommitProxyInterface> commitProxies,
std::vector<GrvProxyInterface> grvProxies,
std::vector<ResolverInterface> resolvers,
DBRecoveryCount recoveryCount,
std::vector<UID> priorCommittedLogServers) {
RegisterMasterRequest masterReq;
masterReq.id = self->masterInterface.id();
masterReq.mi = self->masterInterface.locality;
masterReq.logSystemConfig = logSystemConfig;
masterReq.commitProxies = commitProxies;
masterReq.grvProxies = grvProxies;
masterReq.resolvers = resolvers;
masterReq.recoveryCount = recoveryCount;
if (self->hasConfiguration)
masterReq.configuration = self->configuration;
masterReq.registrationCount = ++self->registrationCount;
masterReq.priorCommittedLogServers = priorCommittedLogServers;
masterReq.recoveryState = self->recoveryState;
masterReq.recoveryStalled = self->recruitmentStalled->get();
masterReq.clusterId = self->clusterId;
return brokenPromiseToNever(self->clusterController.registerMaster.getReply(masterReq));
}
ACTOR Future<Void> updateRegistration(Reference<ClusterRecoveryData> self, Reference<ILogSystem> logSystem) {
state Database cx = openDBOnServer(self->dbInfo, TaskPriority::DefaultEndpoint, LockAware::True);
state Future<Void> trigger = self->registrationTrigger.onTrigger();
state Future<Void> updateLogsKey;
loop {
wait(trigger);
wait(delay(.001)); // Coalesce multiple changes
trigger = self->registrationTrigger.onTrigger();
auto logSystemConfig = logSystem->getLogSystemConfig();
TraceEvent("UpdateRegistration", self->dbgid)
.detail("RecoveryCount", self->cstate.myDBState.recoveryCount)
.detail("OldestBackupEpoch", logSystemConfig.oldestBackupEpoch)
.detail("Logs", describe(logSystemConfig.tLogs))
.detail("CStateUpdated", self->cstateUpdated.isSet())
.detail("RecoveryTxnVersion", self->recoveryTransactionVersion)
.detail("LastEpochEnd", self->lastEpochEnd);
if (!self->cstateUpdated.isSet()) {
wait(sendMasterRegistration(self.getPtr(),
logSystemConfig,
self->provisionalCommitProxies,
self->provisionalGrvProxies,
self->resolvers,
self->cstate.myDBState.recoveryCount,
self->cstate.prevDBState.getPriorCommittedLogServers()));
} else if (self->recoveryState >= RecoveryState::ACCEPTING_COMMITS) {
updateLogsKey = updateLogsValue(self, cx);
wait(sendMasterRegistration(self.getPtr(),
logSystemConfig,
self->commitProxies,
self->grvProxies,
self->resolvers,
self->cstate.myDBState.recoveryCount,
std::vector<UID>()));
} else {
// The cluster should enter the accepting commits phase soon, and then we will register again
TEST(true); // cstate is updated but we aren't accepting commits yet
}
}
}
ACTOR Future<Standalone<CommitTransactionRef>> provisionalMaster(Reference<ClusterRecoveryData> parent,
Future<Void> activate) {
wait(activate);
// Register a fake commit proxy (to be provided right here) to make ourselves available to clients
parent->provisionalCommitProxies = std::vector<CommitProxyInterface>(1);
parent->provisionalCommitProxies[0].provisional = true;
parent->provisionalCommitProxies[0].initEndpoints();
parent->provisionalGrvProxies = std::vector<GrvProxyInterface>(1);
parent->provisionalGrvProxies[0].provisional = true;
parent->provisionalGrvProxies[0].initEndpoints();
state Future<Void> waitCommitProxyFailure =
waitFailureServer(parent->provisionalCommitProxies[0].waitFailure.getFuture());
state Future<Void> waitGrvProxyFailure =
waitFailureServer(parent->provisionalGrvProxies[0].waitFailure.getFuture());
parent->registrationTrigger.trigger();
auto lockedKey = parent->txnStateStore->readValue(databaseLockedKey).get();
state bool locked = lockedKey.present() && lockedKey.get().size();
state Optional<Value> metadataVersion = parent->txnStateStore->readValue(metadataVersionKey).get();
// We respond to a minimal subset of the commit proxy protocol. Our sole purpose is to receive a single write-only
// transaction which might repair our configuration, and return it.
loop choose {
when(GetReadVersionRequest req =
waitNext(parent->provisionalGrvProxies[0].getConsistentReadVersion.getFuture())) {
if ((req.flags & GetReadVersionRequest::FLAG_CAUSAL_READ_RISKY) &&
(req.flags & GetReadVersionRequest::FLAG_USE_PROVISIONAL_PROXIES) && parent->lastEpochEnd) {
GetReadVersionReply rep;
rep.version = parent->lastEpochEnd;
rep.locked = locked;
rep.metadataVersion = metadataVersion;
req.reply.send(rep);
} else
req.reply.send(Never()); // We can't perform causally consistent reads without recovering
}
when(CommitTransactionRequest req = waitNext(parent->provisionalCommitProxies[0].commit.getFuture())) {
req.reply.send(Never()); // don't reply (clients always get commit_unknown_result)
auto t = &req.transaction;
if (t->read_snapshot == parent->lastEpochEnd && //< So no transactions can fall between the read snapshot
// and the recovery transaction this (might) be merged with
// vvv and also the changes we will make in the recovery
// transaction (most notably to lastEpochEndKey) BEFORE we
// merge initialConfChanges won't conflict