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foundationdb/fdbserver/RestoreMaster.actor.cpp

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/*
* RestoreMaster.actor.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 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.
*/
// This file implements the functions for RestoreMaster role
#include "fdbclient/NativeAPI.actor.h"
#include "fdbclient/SystemData.h"
#include "fdbclient/BackupAgent.actor.h"
#include "fdbclient/ManagementAPI.actor.h"
#include "fdbclient/MutationList.h"
#include "fdbclient/BackupContainer.h"
#include "fdbserver/RestoreUtil.h"
#include "fdbserver/RestoreCommon.actor.h"
#include "fdbserver/RestoreRoleCommon.actor.h"
#include "fdbserver/RestoreMaster.actor.h"
#include "fdbserver/RestoreApplier.actor.h"
#include "fdbserver/RestoreLoader.actor.h"
#include "flow/actorcompiler.h" // This must be the last #include.
ACTOR static Future<Void> clearDB(Database cx);
ACTOR static Future<Void> collectBackupFiles(Reference<IBackupContainer> bc, std::vector<RestoreFileFR>* rangeFiles,
std::vector<RestoreFileFR>* logFiles, Database cx, RestoreRequest request);
ACTOR static Future<Version> processRestoreRequest(Reference<RestoreMasterData> self, Database cx, RestoreRequest request);
ACTOR static Future<Void> startProcessRestoreRequests(Reference<RestoreMasterData> self, Database cx);
ACTOR static Future<Void> distributeWorkloadPerVersionBatch(Reference<RestoreMasterData> self, Database cx,
RestoreRequest request, VersionBatch versionBatch);
ACTOR static Future<Void> recruitRestoreRoles(Reference<RestoreWorkerData> masterWorker,
Reference<RestoreMasterData> masterData);
ACTOR static Future<Void> distributeRestoreSysInfo(Reference<RestoreWorkerData> masterWorker,
Reference<RestoreMasterData> masterData);
ACTOR static Future<Standalone<VectorRef<RestoreRequest>>> collectRestoreRequests(Database cx);
ACTOR static Future<Void> initializeVersionBatch(Reference<RestoreMasterData> self);
ACTOR static Future<Void> notifyApplierToApplyMutations(Reference<RestoreMasterData> self);
ACTOR static Future<Void> notifyRestoreCompleted(Reference<RestoreMasterData> self, Database cx);
void splitKeyRangeForAppliers(Reference<RestoreMasterData> self);
ACTOR Future<Void> startRestoreMaster(Reference<RestoreWorkerData> masterWorker, Database cx) {
state Reference<RestoreMasterData> self = Reference<RestoreMasterData>(new RestoreMasterData());
try {
// recruitRestoreRoles must come after masterWorker has finished collectWorkerInterface
wait(recruitRestoreRoles(masterWorker, self));
wait(distributeRestoreSysInfo(masterWorker, self));
wait(startProcessRestoreRequests(self, cx));
} catch (Error& e) {
TraceEvent(SevError, "FastRestore")
.detail("StartRestoreMaster", "Unexpectedly unhandled error")
.detail("Error", e.what())
.detail("ErrorCode", e.code());
}
return Void();
}
// RestoreWorker that has restore master role: Recruite a role for each worker
ACTOR Future<Void> recruitRestoreRoles(Reference<RestoreWorkerData> masterWorker,
Reference<RestoreMasterData> masterData) {
state int nodeIndex = 0;
state RestoreRole role = RestoreRole::Invalid;
TraceEvent("FastRestore")
.detail("RecruitRestoreRoles", masterWorker->workerInterfaces.size())
.detail("NumLoaders", opConfig.num_loaders)
.detail("NumAppliers", opConfig.num_appliers);
ASSERT(masterData->loadersInterf.empty() && masterData->appliersInterf.empty());
ASSERT(masterData.isValid());
ASSERT(opConfig.num_loaders > 0 && opConfig.num_appliers > 0);
// We assign 1 role per worker for now
ASSERT(opConfig.num_loaders + opConfig.num_appliers <= masterWorker->workerInterfaces.size());
// Assign a role to each worker
std::vector<std::pair<UID, RestoreRecruitRoleRequest>> requests;
for (auto& workerInterf : masterWorker->workerInterfaces) {
if (nodeIndex >= 0 && nodeIndex < opConfig.num_appliers) {
// [0, numApplier) are appliers
role = RestoreRole::Applier;
} else if (nodeIndex >= opConfig.num_appliers && nodeIndex < opConfig.num_loaders + opConfig.num_appliers) {
// [numApplier, numApplier + numLoader) are loaders
role = RestoreRole::Loader;
} else {
break;
}
TraceEvent("FastRestore")
.detail("Role", getRoleStr(role))
.detail("NodeIndex", nodeIndex)
.detail("WorkerNode", workerInterf.first);
requests.emplace_back(workerInterf.first, RestoreRecruitRoleRequest(role, nodeIndex));
nodeIndex++;
}
state std::vector<RestoreRecruitRoleReply> replies;
wait(getBatchReplies(&RestoreWorkerInterface::recruitRole, masterWorker->workerInterfaces, requests, &replies));
for (auto& reply : replies) {
if (reply.role == RestoreRole::Applier) {
ASSERT_WE_THINK(reply.applier.present());
masterData->appliersInterf[reply.applier.get().id()] = reply.applier.get();
} else if (reply.role == RestoreRole::Loader) {
ASSERT_WE_THINK(reply.loader.present());
masterData->loadersInterf[reply.loader.get().id()] = reply.loader.get();
} else {
TraceEvent(SevError, "FastRestore").detail("RecruitRestoreRoles_InvalidRole", reply.role);
}
}
TraceEvent("FastRestore").detail("RecruitRestoreRolesDone", masterWorker->workerInterfaces.size());
return Void();
}
ACTOR Future<Void> distributeRestoreSysInfo(Reference<RestoreWorkerData> masterWorker,
Reference<RestoreMasterData> masterData) {
ASSERT(masterData.isValid());
ASSERT(!masterData->loadersInterf.empty());
RestoreSysInfo sysInfo(masterData->appliersInterf);
std::vector<std::pair<UID, RestoreSysInfoRequest>> requests;
for (auto& loader : masterData->loadersInterf) {
requests.push_back(std::make_pair(loader.first, RestoreSysInfoRequest(sysInfo)));
}
TraceEvent("FastRestore").detail("DistributeRestoreSysInfoToLoaders", masterData->loadersInterf.size());
wait(sendBatchRequests(&RestoreLoaderInterface::updateRestoreSysInfo, masterData->loadersInterf, requests));
return Void();
}
// The server of the restore master. It drives the restore progress with the following steps:
// 1) Lock database and clear the normal keyspace
// 2) Wait on each RestoreRequest, which is sent by RestoreAgent operated by DBA
// 3) Process each restore request in actor processRestoreRequest;
// 3.1) Sample workload to decide the key range for each applier, which is implemented as a dummy sampling;
// 3.2) Send each loader the map of key-range to applier interface;
// 3.3) Construct requests of which file should be loaded by which loader, and send requests to loaders;
// 4) After process all restore requests, finish restore by cleaning up the restore related system key
// and ask all restore roles to quit.
ACTOR Future<Void> startProcessRestoreRequests(Reference<RestoreMasterData> self, Database cx) {
state UID randomUID = deterministicRandom()->randomUniqueID();
state Standalone<VectorRef<RestoreRequest>> restoreRequests = wait(collectRestoreRequests(cx));
state int numTries = 0;
state int restoreIndex = 0;
TraceEvent("FastRestore").detail("RestoreMaster", "WaitOnRestoreRequests");
// lock DB for restore
numTries = 0;
loop {
try {
wait(lockDatabase(cx, randomUID));
state Reference<ReadYourWritesTransaction> tr =
Reference<ReadYourWritesTransaction>(new ReadYourWritesTransaction(cx));
tr->reset();
tr->setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
tr->setOption(FDBTransactionOptions::LOCK_AWARE);
wait(checkDatabaseLock(tr, randomUID));
TraceEvent("FastRestore").detail("DBIsLocked", randomUID);
break;
} catch (Error& e) {
TraceEvent("FastRestore").detail("CheckLockError", e.what());
TraceEvent(numTries > 50 ? SevError : SevWarnAlways, "FastRestoreMayFail")
.detail("Reason", "DB is not properly locked")
.detail("ExpectedLockID", randomUID);
numTries++;
wait(delay(5.0));
}
}
wait(clearDB(cx));
// Step: Perform the restore requests
try {
for (restoreIndex = 0; restoreIndex < restoreRequests.size(); restoreIndex++) {
RestoreRequest& request = restoreRequests[restoreIndex];
TraceEvent("FastRestore").detail("RestoreRequestInfo", request.toString());
wait(success(processRestoreRequest(self, cx, request)));
}
} catch (Error& e) {
if (restoreIndex < restoreRequests.size()) {
TraceEvent(SevError, "FastRestoreFailed")
.detail("RestoreRequest", restoreRequests[restoreIndex].toString());
} else {
TraceEvent(SevError, "FastRestoreFailed")
.detail("RestoreRequests", restoreRequests.size())
.detail("RestoreIndex", restoreIndex);
}
}
// Step: Notify all restore requests have been handled by cleaning up the restore keys
wait(notifyRestoreCompleted(self, cx));
try {
wait(unlockDatabase(cx, randomUID));
} catch (Error& e) {
TraceEvent(SevError, "UnlockDBFailed").detail("UID", randomUID.toString());
ASSERT_WE_THINK(false); // This unlockDatabase should always succeed, we think.
}
TraceEvent("FastRestore").detail("RestoreMasterComplete", self->id());
return Void();
}
ACTOR static Future<Version> processRestoreRequest(Reference<RestoreMasterData> self, Database cx,
RestoreRequest request) {
state std::vector<RestoreFileFR> rangeFiles;
state std::vector<RestoreFileFR> logFiles;
state std::vector<RestoreFileFR> allFiles;
state std::map<Version, VersionBatch>::iterator versionBatch = self->versionBatches.begin();
self->initBackupContainer(request.url);
// Get all backup files' description and save them to files
wait(collectBackupFiles(self->bc, &rangeFiles, &logFiles, cx, request));
std::sort(rangeFiles.begin(), rangeFiles.end());
std::sort(logFiles.begin(), logFiles.end(), [](RestoreFileFR const& f1, RestoreFileFR const& f2) -> bool {
return std::tie(f1.endVersion, f1.beginVersion, f1.fileIndex) <
std::tie(f2.endVersion, f2.beginVersion, f2.fileIndex);
});
self->buildVersionBatches(rangeFiles, logFiles, &self->versionBatches); // Divide files into version batches
self->dumpVersionBatches(self->versionBatches);
ASSERT(self->batchIndex == 1); // versionBatchIndex starts at 1 because NotifiedVersion starts at 0
for (versionBatch = self->versionBatches.begin(); versionBatch != self->versionBatches.end(); versionBatch++) {
wait(initializeVersionBatch(self));
wait(distributeWorkloadPerVersionBatch(self, cx, request, versionBatch->second));
self->batchIndex++;
}
TraceEvent("FastRestore").detail("RestoreToVersion", request.targetVersion);
return request.targetVersion;
}
ACTOR static Future<Void> loadFilesOnLoaders(Reference<RestoreMasterData> self, Database cx, RestoreRequest request,
VersionBatch versionBatch, bool isRangeFile) {
TraceEvent("FastRestore")
.detail("FileTypeLoadedInVersionBatch", isRangeFile)
.detail("BeginVersion", versionBatch.beginVersion)
.detail("EndVersion", versionBatch.endVersion);
std::vector<RestoreFileFR>* files = nullptr;
if (isRangeFile) {
files = &versionBatch.rangeFiles;
} else {
files = &versionBatch.logFiles;
}
// sort files in increasing order of beginVersion
std::sort(files->begin(), files->end());
std::vector<std::pair<UID, RestoreLoadFileRequest>> requests;
std::map<UID, RestoreLoaderInterface>::iterator loader = self->loadersInterf.begin();
for (auto& file : *files) {
// NOTE: Cannot skip empty files because empty files, e.g., log file, still need to generate dummy mutation to
// drive applier's NotifiedVersion.
if (loader == self->loadersInterf.end()) {
loader = self->loadersInterf.begin();
}
// Prepare loading
LoadingParam param;
param.url = request.url;
param.isRangeFile = file.isRange;
param.rangeVersion = file.isRange ? file.version : -1;
param.blockSize = file.blockSize;
param.asset.uid = deterministicRandom()->randomUniqueID();
param.asset.filename = file.fileName;
param.asset.fileIndex = file.fileIndex;
param.asset.offset = 0;
param.asset.len = file.fileSize;
param.asset.range = request.range;
param.asset.beginVersion = versionBatch.beginVersion;
param.asset.endVersion = versionBatch.endVersion;
TraceEvent("FastRestore").detail("LoadParam", param.toString()).detail("LoaderID", loader->first.toString());
ASSERT_WE_THINK(param.asset.len > 0);
ASSERT_WE_THINK(param.asset.offset >= 0);
ASSERT_WE_THINK(param.asset.offset <= file.fileSize);
ASSERT_WE_THINK(param.asset.beginVersion <= param.asset.endVersion);
requests.emplace_back(loader->first, RestoreLoadFileRequest(param));
loader++;
}
state std::vector<RestoreLoadFileReply> replies;
// Wait on the batch of load files or log files
wait(getBatchReplies(&RestoreLoaderInterface::loadFile, self->loadersInterf, requests, &replies));
TraceEvent("FastRestore").detail("VersionBatch", self->batchIndex).detail("SamplingReplies", replies.size());
for (auto& reply : replies) {
TraceEvent("FastRestore").detail("VersionBatch", self->batchIndex).detail("SamplingReplies", reply.toString());
for (int i = 0; i < reply.samples.size(); ++i) {
MutationRef mutation = reply.samples[i];
self->samples.addMetric(mutation.param1, mutation.totalSize());
self->samplesSize += mutation.totalSize();
}
}
return Void();
}
// Ask loaders to send its buffered mutations to appliers
ACTOR static Future<Void> sendMutationsFromLoaders(Reference<RestoreMasterData> self, bool useRangeFile) {
TraceEvent("FastRestore")
.detail("SendMutationsFromLoaders", self->batchIndex)
.detail("UseRangeFiles", useRangeFile);
std::vector<std::pair<UID, RestoreSendMutationsToAppliersRequest>> requests;
for (auto& loader : self->loadersInterf) {
requests.emplace_back(loader.first, RestoreSendMutationsToAppliersRequest(self->rangeToApplier, useRangeFile));
}
wait(sendBatchRequests(&RestoreLoaderInterface::sendMutations, self->loadersInterf, requests));
return Void();
}
ACTOR static Future<Void> distributeWorkloadPerVersionBatch(Reference<RestoreMasterData> self, Database cx,
RestoreRequest request, VersionBatch versionBatch) {
ASSERT(!versionBatch.isEmpty());
ASSERT(self->loadersInterf.size() > 0);
ASSERT(self->appliersInterf.size() > 0);
// Parse log files and send mutations to appliers before we parse range files
// TODO: Allow loading both range and log files in parallel
wait(loadFilesOnLoaders(self, cx, request, versionBatch, false));
wait(loadFilesOnLoaders(self, cx, request, versionBatch, true));
splitKeyRangeForAppliers(self);
// Loaders should ensure log files' mutations sent to appliers before range files' mutations
// TODO: Let applier buffer mutations from log and range files differently so that loaders can send mutations in
// parallel
wait(sendMutationsFromLoaders(self, false));
wait(sendMutationsFromLoaders(self, true));
wait(notifyApplierToApplyMutations(self));
return Void();
}
// Decide which key range should be taken by which applier
void splitKeyRangeForAppliers(Reference<RestoreMasterData> self) {
ASSERT(self->samplesSize >= 0);
int numAppliers = self->appliersInterf.size();
double slotSize = std::max(self->samplesSize / numAppliers, 1.0);
std::vector<Key> keyrangeSplitter;
keyrangeSplitter.push_back(normalKeys.begin); // First slot
double cumulativeSize = slotSize;
TraceEvent("FastRestore").detail("VersionBatch", self->batchIndex).detail("SamplingSize", self->samplesSize);
while (cumulativeSize < self->samplesSize) {
IndexedSet<Key, int64_t>::iterator lowerBound = self->samples.index(cumulativeSize);
if (lowerBound == self->samples.end()) {
break;
}
keyrangeSplitter.push_back(*lowerBound);
TraceEvent("FastRestore")
.detail("VersionBatch", self->batchIndex)
.detail("CumulativeSize", cumulativeSize)
.detail("SlotSize", slotSize);
cumulativeSize += slotSize;
}
if (keyrangeSplitter.size() < numAppliers) {
TraceEvent(SevWarnAlways, "FastRestore")
.detail("NotAllAppliersAreUsed", keyrangeSplitter.size())
.detail("NumAppliers", numAppliers);
} else if (keyrangeSplitter.size() > numAppliers) {
TraceEvent(SevError, "FastRestore")
.detail("TooManySlotsThanAppliers", keyrangeSplitter.size())
.detail("NumAppliers", numAppliers);
}
// std::sort(keyrangeSplitter.begin(), keyrangeSplitter.end());
int i = 0;
self->rangeToApplier.clear();
for (auto& applier : self->appliersInterf) {
if (i >= keyrangeSplitter.size()) {
break; // Not all appliers will be used
}
self->rangeToApplier[keyrangeSplitter[i]] = applier.first;
i++;
}
ASSERT(self->rangeToApplier.size() > 0);
ASSERT(self->sanityCheckApplierKeyRange());
self->logApplierKeyRange();
}
ACTOR static Future<Standalone<VectorRef<RestoreRequest>>> collectRestoreRequests(Database cx) {
state Standalone<VectorRef<RestoreRequest>> restoreRequests;
state Future<Void> watch4RestoreRequest;
state ReadYourWritesTransaction tr(cx);
// wait for the restoreRequestTriggerKey to be set by the client/test workload
loop {
try {
tr.reset();
tr.setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
tr.setOption(FDBTransactionOptions::LOCK_AWARE);
Optional<Value> numRequests = wait(tr.get(restoreRequestTriggerKey));
if (!numRequests.present()) {
watch4RestoreRequest = tr.watch(restoreRequestTriggerKey);
wait(tr.commit());
wait(watch4RestoreRequest);
} else {
Standalone<RangeResultRef> restoreRequestValues =
wait(tr.getRange(restoreRequestKeys, CLIENT_KNOBS->TOO_MANY));
ASSERT(!restoreRequestValues.more);
if (restoreRequestValues.size()) {
for (auto& it : restoreRequestValues) {
restoreRequests.push_back(restoreRequests.arena(), decodeRestoreRequestValue(it.value));
TraceEvent("FastRestore").detail("RestoreRequest", restoreRequests.back().toString());
}
}
break;
}
} catch (Error& e) {
wait(tr.onError(e));
}
}
return restoreRequests;
}
// Collect the backup files' description into output_files by reading the backupContainer bc.
ACTOR static Future<Void> collectBackupFiles(Reference<IBackupContainer> bc, std::vector<RestoreFileFR>* rangeFiles,
std::vector<RestoreFileFR>* logFiles, Database cx,
RestoreRequest request) {
state BackupDescription desc = wait(bc->describeBackup());
// Convert version to real time for operators to read the BackupDescription desc.
wait(desc.resolveVersionTimes(cx));
TraceEvent("FastRestore").detail("BackupDesc", desc.toString());
if (request.targetVersion == invalidVersion && desc.maxRestorableVersion.present()) {
request.targetVersion = desc.maxRestorableVersion.get();
}
Optional<RestorableFileSet> restorable = wait(bc->getRestoreSet(request.targetVersion));
if (!restorable.present()) {
TraceEvent(SevWarn, "FastRestore").detail("NotRestorable", request.targetVersion);
throw restore_missing_data();
}
ASSERT(rangeFiles->empty());
ASSERT(logFiles->empty());
for (const RangeFile& f : restorable.get().ranges) {
TraceEvent("FastRestore").detail("RangeFile", f.toString());
if (f.fileSize <= 0) {
continue;
}
RestoreFileFR file(f.version, f.fileName, true, f.blockSize, f.fileSize, f.version, f.version);
TraceEvent("FastRestore").detail("RangeFileFR", file.toString());
rangeFiles->push_back(file);
}
for (const LogFile& f : restorable.get().logs) {
TraceEvent("FastRestore").detail("LogFile", f.toString());
if (f.fileSize <= 0) {
continue;
}
RestoreFileFR file(f.beginVersion, f.fileName, false, f.blockSize, f.fileSize, f.endVersion, f.beginVersion);
TraceEvent("FastRestore").detail("LogFileFR", file.toString());
logFiles->push_back(file);
}
return Void();
}
ACTOR static Future<Void> clearDB(Database cx) {
wait(runRYWTransaction(cx, [](Reference<ReadYourWritesTransaction> tr) -> Future<Void> {
tr->setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
tr->setOption(FDBTransactionOptions::LOCK_AWARE);
tr->clear(normalKeys);
return Void();
}));
return Void();
}
ACTOR static Future<Void> initializeVersionBatch(Reference<RestoreMasterData> self) {
std::vector<std::pair<UID, RestoreVersionBatchRequest>> requestsToAppliers;
for (auto& applier : self->appliersInterf) {
requestsToAppliers.push_back(std::make_pair(applier.first, RestoreVersionBatchRequest(self->batchIndex)));
}
wait(sendBatchRequests(&RestoreApplierInterface::initVersionBatch, self->appliersInterf, requestsToAppliers));
std::vector<std::pair<UID, RestoreVersionBatchRequest>> requestsToLoaders;
for (auto& loader : self->loadersInterf) {
requestsToLoaders.push_back(std::make_pair(loader.first, RestoreVersionBatchRequest(self->batchIndex)));
}
wait(sendBatchRequests(&RestoreLoaderInterface::initVersionBatch, self->loadersInterf, requestsToLoaders));
self->resetPerVersionBatch();
return Void();
}
// Ask each applier to apply its received mutations to DB
ACTOR static Future<Void> notifyApplierToApplyMutations(Reference<RestoreMasterData> self) {
// Prepare the applyToDB requests
std::vector<std::pair<UID, RestoreVersionBatchRequest>> requests;
for (auto& applier : self->appliersInterf) {
requests.push_back(std::make_pair(applier.first, RestoreVersionBatchRequest(self->batchIndex)));
}
wait(sendBatchRequests(&RestoreApplierInterface::applyToDB, self->appliersInterf, requests));
TraceEvent("FastRestore").detail("Master", self->id()).detail("ApplyToDB", "Completed");
return Void();
}
// Ask all loaders and appliers to perform housecleaning at the end of restore and
// Register the restoreRequestDoneKey to signal the end of restore
ACTOR static Future<Void> notifyRestoreCompleted(Reference<RestoreMasterData> self, Database cx) {
state Reference<ReadYourWritesTransaction> tr(new ReadYourWritesTransaction(cx));
std::vector<std::pair<UID, RestoreVersionBatchRequest>> requests;
for (auto& loader : self->loadersInterf) {
requests.push_back(std::make_pair(loader.first, RestoreVersionBatchRequest(self->batchIndex)));
}
// A loader exits immediately after it receives the request. Master may not receive acks.
Future<Void> endLoaders = sendBatchRequests(&RestoreLoaderInterface::finishRestore, self->loadersInterf, requests);
requests.clear();
for (auto& applier : self->appliersInterf) {
requests.push_back(std::make_pair(applier.first, RestoreVersionBatchRequest(self->batchIndex)));
}
Future<Void> endApplier =
sendBatchRequests(&RestoreApplierInterface::finishRestore, self->appliersInterf, requests);
wait(delay(5.0)); // Give some time for loaders and appliers to exit
// Notify tester that the restore has finished
loop {
try {
tr->setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
tr->setOption(FDBTransactionOptions::LOCK_AWARE);
tr->clear(restoreRequestTriggerKey);
tr->clear(restoreRequestKeys);
Version readVersion = wait(tr->getReadVersion());
tr->set(restoreRequestDoneKey, restoreRequestDoneVersionValue(readVersion));
wait(tr->commit());
break;
} catch (Error& e) {
wait(tr->onError(e));
}
}
TraceEvent("FastRestore").detail("RestoreMaster", "RestoreCompleted");
return Void();
}
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