/*
 * worker.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.
 */

#include <tuple>
#include <boost/lexical_cast.hpp>

#include "fdbrpc/Locality.h"
#include "fdbclient/GlobalConfig.actor.h"
#include "fdbclient/ProcessInterface.h"
#include "fdbclient/StorageServerInterface.h"
#include "fdbserver/Knobs.h"
#include "flow/ActorCollection.h"
#include "flow/ProtocolVersion.h"
#include "flow/SystemMonitor.h"
#include "flow/TDMetric.actor.h"
#include "fdbrpc/simulator.h"
#include "fdbclient/NativeAPI.actor.h"
#include "fdbserver/MetricLogger.actor.h"
#include "fdbserver/BackupInterface.h"
#include "fdbserver/RoleLineage.actor.h"
#include "fdbserver/WorkerInterface.actor.h"
#include "fdbserver/IKeyValueStore.h"
#include "fdbserver/WaitFailure.h"
#include "fdbserver/TesterInterface.actor.h" // for poisson()
#include "fdbserver/IDiskQueue.h"
#include "fdbclient/DatabaseContext.h"
#include "fdbserver/DataDistributorInterface.h"
#include "fdbserver/ServerDBInfo.h"
#include "fdbserver/FDBExecHelper.actor.h"
#include "fdbserver/CoordinationInterface.h"
#include "fdbclient/MonitorLeader.h"
#include "fdbclient/ClientWorkerInterface.h"
#include "flow/Profiler.h"
#include "flow/ThreadHelper.actor.h"
#include "flow/Trace.h"
#include "flow/flow.h"
#include "flow/network.h"

#ifdef __linux__
#include <fcntl.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#endif
#if defined(__linux__) || defined(__FreeBSD__)
#ifdef USE_GPERFTOOLS
#include "gperftools/profiler.h"
#include "gperftools/heap-profiler.h"
#endif
#include <unistd.h>
#include <thread>
#include <execinfo.h>
#endif
#include "flow/actorcompiler.h" // This must be the last #include.

#if CENABLED(0, NOT_IN_CLEAN)
extern IKeyValueStore* keyValueStoreCompressTestData(IKeyValueStore* store);
#define KV_STORE(filename, uid) keyValueStoreCompressTestData(keyValueStoreSQLite(filename, uid))
#elif CENABLED(0, NOT_IN_CLEAN)
#define KV_STORE(filename, uid) keyValueStoreSQLite(filename, uid)
#else
#define KV_STORE(filename, uid) keyValueStoreMemory(filename, uid)
#endif

namespace {
RoleLineageCollector roleLineageCollector;
}

ACTOR Future<std::vector<Endpoint>> tryDBInfoBroadcast(RequestStream<UpdateServerDBInfoRequest> stream,
                                                       UpdateServerDBInfoRequest req) {
	ErrorOr<std::vector<Endpoint>> rep =
	    wait(stream.getReplyUnlessFailedFor(req, SERVER_KNOBS->DBINFO_FAILED_DELAY, 0));
	if (rep.present()) {
		return rep.get();
	}
	req.broadcastInfo.push_back(stream.getEndpoint());
	return req.broadcastInfo;
}

ACTOR Future<std::vector<Endpoint>> broadcastDBInfoRequest(UpdateServerDBInfoRequest req,
                                                           int sendAmount,
                                                           Optional<Endpoint> sender,
                                                           bool sendReply) {
	state std::vector<Future<std::vector<Endpoint>>> replies;
	state ReplyPromise<std::vector<Endpoint>> reply = req.reply;
	resetReply(req);
	int currentStream = 0;
	std::vector<Endpoint> broadcastEndpoints = req.broadcastInfo;
	for (int i = 0; i < sendAmount && currentStream < broadcastEndpoints.size(); i++) {
		std::vector<Endpoint> endpoints;
		RequestStream<UpdateServerDBInfoRequest> cur(broadcastEndpoints[currentStream++]);
		while (currentStream < broadcastEndpoints.size() * (i + 1) / sendAmount) {
			endpoints.push_back(broadcastEndpoints[currentStream++]);
		}
		req.broadcastInfo = endpoints;
		replies.push_back(tryDBInfoBroadcast(cur, req));
		resetReply(req);
	}
	wait(waitForAll(replies));
	std::vector<Endpoint> notUpdated;
	if (sender.present()) {
		notUpdated.push_back(sender.get());
	}
	for (auto& it : replies) {
		notUpdated.insert(notUpdated.end(), it.get().begin(), it.get().end());
	}
	if (sendReply) {
		reply.send(notUpdated);
	}
	return notUpdated;
}

ACTOR static Future<Void> extractClientInfo(Reference<AsyncVar<ServerDBInfo>> db,
                                            Reference<AsyncVar<ClientDBInfo>> info) {
	state std::vector<UID> lastCommitProxyUIDs;
	state std::vector<CommitProxyInterface> lastCommitProxies;
	state std::vector<UID> lastGrvProxyUIDs;
	state std::vector<GrvProxyInterface> lastGrvProxies;
	loop {
		ClientDBInfo ni = db->get().client;
		shrinkProxyList(ni, lastCommitProxyUIDs, lastCommitProxies, lastGrvProxyUIDs, lastGrvProxies);
		info->set(ni);
		wait(db->onChange());
	}
}

Database openDBOnServer(Reference<AsyncVar<ServerDBInfo>> const& db,
                        TaskPriority taskID,
                        bool enableLocalityLoadBalance,
                        bool lockAware) {
	auto info = makeReference<AsyncVar<ClientDBInfo>>();
	return DatabaseContext::create(info,
	                               extractClientInfo(db, info),
	                               enableLocalityLoadBalance ? db->get().myLocality : LocalityData(),
	                               enableLocalityLoadBalance,
	                               taskID,
	                               lockAware);
}

struct ErrorInfo {
	Error error;
	const Role& role;
	UID id;
	ErrorInfo(Error e, const Role& role, UID id) : error(e), role(role), id(id) {}
	template <class Ar>
	void serialize(Ar&) {
		ASSERT(false);
	}
};

Error checkIOTimeout(Error const& e) {
	// Convert all_errors to io_timeout if global timeout bool was set
	bool timeoutOccurred = (bool)g_network->global(INetwork::enASIOTimedOut);
	// In simulation, have to check global timed out flag for both this process and the machine process on which IO is
	// done
	if (g_network->isSimulated() && !timeoutOccurred)
		timeoutOccurred = g_pSimulator->getCurrentProcess()->machine->machineProcess->global(INetwork::enASIOTimedOut);

	if (timeoutOccurred) {
		TEST(true); // Timeout occurred
		Error timeout = io_timeout();
		// Preserve injectedness of error
		if (e.isInjectedFault())
			timeout = timeout.asInjectedFault();
		return timeout;
	}
	return e;
}

ACTOR Future<Void> forwardError(PromiseStream<ErrorInfo> errors, Role role, UID id, Future<Void> process) {
	try {
		wait(process);
		errors.send(ErrorInfo(success(), role, id));
		return Void();
	} catch (Error& e) {
		errors.send(ErrorInfo(e, role, id));
		return Void();
	}
}

ACTOR Future<Void> handleIOErrors(Future<Void> actor, IClosable* store, UID id, Future<Void> onClosed = Void()) {
	state Future<ErrorOr<Void>> storeError = actor.isReady() ? Never() : errorOr(store->getError());
	choose {
		when(state ErrorOr<Void> e = wait(errorOr(actor))) {
			if (e.isError() && e.getError().code() == error_code_please_reboot) {
				// no need to wait.
			} else {
				wait(onClosed);
			}
			if (e.isError() && e.getError().code() == error_code_broken_promise && !storeError.isReady()) {
				wait(delay(0.00001 + FLOW_KNOBS->MAX_BUGGIFIED_DELAY));
			}
			if (storeError.isReady())
				throw storeError.get().getError();
			if (e.isError())
				throw e.getError();
			else
				return e.get();
		}
		when(ErrorOr<Void> e = wait(storeError)) {
			TraceEvent("WorkerTerminatingByIOError", id).error(e.getError(), true);
			actor.cancel();
			// file_not_found can occur due to attempting to open a partially deleted DiskQueue, which should not be
			// reported SevError.
			if (e.getError().code() == error_code_file_not_found) {
				TEST(true); // Worker terminated with file_not_found error
				return Void();
			}
			throw e.getError();
		}
	}
}

ACTOR Future<Void> workerHandleErrors(FutureStream<ErrorInfo> errors) {
	loop choose {
		when(ErrorInfo _err = waitNext(errors)) {
			ErrorInfo err = _err;
			bool ok = err.error.code() == error_code_success || err.error.code() == error_code_please_reboot ||
			          err.error.code() == error_code_actor_cancelled ||
			          err.error.code() == error_code_coordinators_changed || // The worker server was cancelled
			          err.error.code() == error_code_shutdown_in_progress;

			if (!ok) {
				err.error = checkIOTimeout(err.error); // Possibly convert error to io_timeout
			}

			endRole(err.role, err.id, "Error", ok, err.error);

			if (err.error.code() == error_code_please_reboot ||
			    (err.role == Role::SHARED_TRANSACTION_LOG &&
			     (err.error.code() == error_code_io_error || err.error.code() == error_code_io_timeout)))
				throw err.error;
		}
	}
}

// Improve simulation code coverage by sometimes deferring the destruction of workerInterface (and therefore "endpoint
// not found" responses to clients
//		for an extra second, so that clients are more likely to see broken_promise errors
ACTOR template <class T>
Future<Void> zombie(T workerInterface, Future<Void> worker) {
	try {
		wait(worker);
		if (BUGGIFY)
			wait(delay(1.0));
		return Void();
	} catch (Error& e) {
		throw;
	}
}

ACTOR Future<Void> loadedPonger(FutureStream<LoadedPingRequest> pings) {
	state Standalone<StringRef> payloadBack(std::string(20480, '.'));

	loop {
		LoadedPingRequest pong = waitNext(pings);
		LoadedReply rep;
		rep.payload = (pong.loadReply ? payloadBack : LiteralStringRef(""));
		rep.id = pong.id;
		pong.reply.send(rep);
	}
}

StringRef fileStoragePrefix = LiteralStringRef("storage-");
StringRef fileLogDataPrefix = LiteralStringRef("log-");
StringRef fileVersionedLogDataPrefix = LiteralStringRef("log2-");
StringRef fileLogQueuePrefix = LiteralStringRef("logqueue-");
StringRef tlogQueueExtension = LiteralStringRef("fdq");

enum class FilesystemCheck {
	FILES_ONLY,
	DIRECTORIES_ONLY,
	FILES_AND_DIRECTORIES,
};

struct KeyValueStoreSuffix {
	KeyValueStoreType type;
	std::string suffix;
	FilesystemCheck check;
};

KeyValueStoreSuffix bTreeV1Suffix = { KeyValueStoreType::SSD_BTREE_V1, ".fdb", FilesystemCheck::FILES_ONLY };
KeyValueStoreSuffix bTreeV2Suffix = { KeyValueStoreType::SSD_BTREE_V2, ".sqlite", FilesystemCheck::FILES_ONLY };
KeyValueStoreSuffix memorySuffix = { KeyValueStoreType::MEMORY, "-0.fdq", FilesystemCheck::FILES_ONLY };
KeyValueStoreSuffix memoryRTSuffix = { KeyValueStoreType::MEMORY_RADIXTREE, "-0.fdr", FilesystemCheck::FILES_ONLY };
KeyValueStoreSuffix redwoodSuffix = { KeyValueStoreType::SSD_REDWOOD_V1, ".redwood", FilesystemCheck::FILES_ONLY };
KeyValueStoreSuffix rocksdbSuffix = { KeyValueStoreType::SSD_ROCKSDB_V1,
	                                  ".rocksdb",
	                                  FilesystemCheck::DIRECTORIES_ONLY };

std::string validationFilename = "_validate";

std::string filenameFromSample(KeyValueStoreType storeType, std::string folder, std::string sample_filename) {
	if (storeType == KeyValueStoreType::SSD_BTREE_V1)
		return joinPath(folder, sample_filename);
	else if (storeType == KeyValueStoreType::SSD_BTREE_V2)
		return joinPath(folder, sample_filename);
	else if (storeType == KeyValueStoreType::MEMORY || storeType == KeyValueStoreType::MEMORY_RADIXTREE)
		return joinPath(folder, sample_filename.substr(0, sample_filename.size() - 5));
	else if (storeType == KeyValueStoreType::SSD_REDWOOD_V1)
		return joinPath(folder, sample_filename);
	else if (storeType == KeyValueStoreType::SSD_ROCKSDB_V1)
		return joinPath(folder, sample_filename);
	UNREACHABLE();
}

std::string filenameFromId(KeyValueStoreType storeType, std::string folder, std::string prefix, UID id) {
	if (storeType == KeyValueStoreType::SSD_BTREE_V1)
		return joinPath(folder, prefix + id.toString() + ".fdb");
	else if (storeType == KeyValueStoreType::SSD_BTREE_V2)
		return joinPath(folder, prefix + id.toString() + ".sqlite");
	else if (storeType == KeyValueStoreType::MEMORY || storeType == KeyValueStoreType::MEMORY_RADIXTREE)
		return joinPath(folder, prefix + id.toString() + "-");
	else if (storeType == KeyValueStoreType::SSD_REDWOOD_V1)
		return joinPath(folder, prefix + id.toString() + ".redwood");
	else if (storeType == KeyValueStoreType::SSD_ROCKSDB_V1)
		return joinPath(folder, prefix + id.toString() + ".rocksdb");

	UNREACHABLE();
}

struct TLogOptions {
	TLogOptions() = default;
	TLogOptions(TLogVersion v, TLogSpillType s) : version(v), spillType(s) {}

	TLogVersion version = TLogVersion::DEFAULT;
	TLogSpillType spillType = TLogSpillType::UNSET;

	static ErrorOr<TLogOptions> FromStringRef(StringRef s) {
		TLogOptions options;
		for (StringRef key = s.eat("_"), value = s.eat("_"); s.size() != 0 || key.size();
		     key = s.eat("_"), value = s.eat("_")) {
			if (key.size() != 0 && value.size() == 0)
				return default_error_or();

			if (key == LiteralStringRef("V")) {
				ErrorOr<TLogVersion> tLogVersion = TLogVersion::FromStringRef(value);
				if (tLogVersion.isError())
					return tLogVersion.getError();
				options.version = tLogVersion.get();
			} else if (key == LiteralStringRef("LS")) {
				ErrorOr<TLogSpillType> tLogSpillType = TLogSpillType::FromStringRef(value);
				if (tLogSpillType.isError())
					return tLogSpillType.getError();
				options.spillType = tLogSpillType.get();
			} else {
				return default_error_or();
			}
		}
		return options;
	}

	bool operator==(const TLogOptions& o) {
		return version == o.version && (spillType == o.spillType || version >= TLogVersion::V5);
	}

	std::string toPrefix() const {
		std::string toReturn = "";
		switch (version) {
		case TLogVersion::UNSET:
			ASSERT(false);
		case TLogVersion::V2:
			return "";
		case TLogVersion::V3:
		case TLogVersion::V4:
			toReturn =
			    "V_" + boost::lexical_cast<std::string>(version) + "_LS_" + boost::lexical_cast<std::string>(spillType);
			break;
		case TLogVersion::V5:
		case TLogVersion::V6:
			toReturn = "V_" + boost::lexical_cast<std::string>(version);
			break;
		}
		ASSERT_WE_THINK(FromStringRef(toReturn).get() == *this);
		return toReturn + "-";
	}
};

TLogFn tLogFnForOptions(TLogOptions options) {
	switch (options.version) {
	case TLogVersion::V2:
		if (options.spillType == TLogSpillType::REFERENCE)
			ASSERT(false);
		return oldTLog_6_0::tLog;
	case TLogVersion::V3:
	case TLogVersion::V4:
		if (options.spillType == TLogSpillType::VALUE)
			return oldTLog_6_0::tLog;
		else
			return oldTLog_6_2::tLog;
	case TLogVersion::V5:
	case TLogVersion::V6:
		return tLog;
	default:
		ASSERT(false);
	}
	return tLog;
}

struct DiskStore {
	enum COMPONENT { TLogData, Storage, UNSET };

	UID storeID = UID();
	std::string filename = ""; // For KVStoreMemory just the base filename to be passed to IDiskQueue
	COMPONENT storedComponent = UNSET;
	KeyValueStoreType storeType = KeyValueStoreType::END;
	TLogOptions tLogOptions;
};

std::vector<DiskStore> getDiskStores(std::string folder,
                                     std::string suffix,
                                     KeyValueStoreType type,
                                     FilesystemCheck check) {
	std::vector<DiskStore> result;
	vector<std::string> files;

	if (check == FilesystemCheck::FILES_ONLY || check == FilesystemCheck::FILES_AND_DIRECTORIES) {
		files = platform::listFiles(folder, suffix);
	}
	if (check == FilesystemCheck::DIRECTORIES_ONLY || check == FilesystemCheck::FILES_AND_DIRECTORIES) {
		for (const auto& directory : platform::listDirectories(folder)) {
			if (StringRef(directory).endsWith(suffix)) {
				files.push_back(directory);
			}
		}
	}

	for (int idx = 0; idx < files.size(); idx++) {
		DiskStore store;
		store.storeType = type;

		StringRef filename = StringRef(files[idx]);
		Standalone<StringRef> prefix;
		if (filename.startsWith(fileStoragePrefix)) {
			store.storedComponent = DiskStore::Storage;
			prefix = fileStoragePrefix;
		} else if (filename.startsWith(fileVersionedLogDataPrefix)) {
			store.storedComponent = DiskStore::TLogData;
			// Use the option string that's in the file rather than tLogOptions.toPrefix(),
			// because they might be different if a new option was introduced in this version.
			StringRef optionsString = filename.removePrefix(fileVersionedLogDataPrefix).eat("-");
			TraceEvent("DiskStoreVersioned").detail("Filename", filename);
			ErrorOr<TLogOptions> tLogOptions = TLogOptions::FromStringRef(optionsString);
			if (tLogOptions.isError()) {
				TraceEvent(SevWarn, "DiskStoreMalformedFilename").detail("Filename", filename);
				continue;
			}
			TraceEvent("DiskStoreVersionedSuccess").detail("Filename", filename);
			store.tLogOptions = tLogOptions.get();
			prefix = filename.substr(0, fileVersionedLogDataPrefix.size() + optionsString.size() + 1);
		} else if (filename.startsWith(fileLogDataPrefix)) {
			TraceEvent("DiskStoreUnversioned").detail("Filename", filename);
			store.storedComponent = DiskStore::TLogData;
			store.tLogOptions.version = TLogVersion::V2;
			store.tLogOptions.spillType = TLogSpillType::VALUE;
			prefix = fileLogDataPrefix;
		} else
			continue;

		store.storeID = UID::fromString(files[idx].substr(prefix.size(), 32));
		store.filename = filenameFromSample(type, folder, files[idx]);
		result.push_back(store);
	}
	return result;
}

std::vector<DiskStore> getDiskStores(std::string folder) {
	auto result = getDiskStores(folder, bTreeV1Suffix.suffix, bTreeV1Suffix.type, bTreeV1Suffix.check);
	auto result1 = getDiskStores(folder, bTreeV2Suffix.suffix, bTreeV2Suffix.type, bTreeV2Suffix.check);
	result.insert(result.end(), result1.begin(), result1.end());
	auto result2 = getDiskStores(folder, memorySuffix.suffix, memorySuffix.type, memorySuffix.check);
	result.insert(result.end(), result2.begin(), result2.end());
	auto result3 = getDiskStores(folder, redwoodSuffix.suffix, redwoodSuffix.type, redwoodSuffix.check);
	result.insert(result.end(), result3.begin(), result3.end());
	auto result4 = getDiskStores(folder, memoryRTSuffix.suffix, memoryRTSuffix.type, memoryRTSuffix.check);
	result.insert(result.end(), result4.begin(), result4.end());
	auto result5 = getDiskStores(folder, rocksdbSuffix.suffix, rocksdbSuffix.type, rocksdbSuffix.check);
	result.insert(result.end(), result5.begin(), result5.end());
	return result;
}

// Register the worker interf to cluster controller (cc) and
// re-register the worker when key roles interface, e.g., cc, dd, ratekeeper, change.
ACTOR Future<Void> registrationClient(Reference<AsyncVar<Optional<ClusterControllerFullInterface>>> ccInterface,
                                      WorkerInterface interf,
                                      Reference<AsyncVar<ClusterControllerPriorityInfo>> asyncPriorityInfo,
                                      ProcessClass initialClass,
                                      Reference<AsyncVar<Optional<DataDistributorInterface>>> ddInterf,
                                      Reference<AsyncVar<Optional<RatekeeperInterface>>> rkInterf,
                                      Reference<AsyncVar<bool>> degraded,
                                      PromiseStream<ErrorInfo> errors,
                                      LocalityData locality,
                                      Reference<AsyncVar<ServerDBInfo>> dbInfo,
                                      Reference<ClusterConnectionFile> connFile,
                                      Reference<AsyncVar<std::set<std::string>>> issues) {
	// Keeps the cluster controller (as it may be re-elected) informed that this worker exists
	// The cluster controller uses waitFailureClient to find out if we die, and returns from registrationReply
	// (requiring us to re-register) The registration request piggybacks optional distributor interface if it exists.
	state Generation requestGeneration = 0;
	state ProcessClass processClass = initialClass;
	state Reference<AsyncVar<Optional<std::pair<uint16_t, StorageServerInterface>>>> scInterf(
	    new AsyncVar<Optional<std::pair<uint16_t, StorageServerInterface>>>());
	state Future<Void> cacheProcessFuture;
	state Future<Void> cacheErrorsFuture;
	state Optional<double> incorrectTime;
	loop {
		RegisterWorkerRequest request(interf,
		                              initialClass,
		                              processClass,
		                              asyncPriorityInfo->get(),
		                              requestGeneration++,
		                              ddInterf->get(),
		                              rkInterf->get(),
		                              degraded->get());
		for (auto const& i : issues->get()) {
			request.issues.push_back_deep(request.issues.arena(), i);
		}
		ClusterConnectionString fileConnectionString;
		if (connFile && !connFile->fileContentsUpToDate(fileConnectionString)) {
			request.issues.push_back_deep(request.issues.arena(), LiteralStringRef("incorrect_cluster_file_contents"));
			std::string connectionString = connFile->getConnectionString().toString();
			if (!incorrectTime.present()) {
				incorrectTime = now();
			}
			if (connFile->canGetFilename()) {
				// Don't log a SevWarnAlways initially to account for transient issues (e.g. someone else changing the
				// file right before us)
				TraceEvent(now() - incorrectTime.get() > 300 ? SevWarnAlways : SevWarn, "IncorrectClusterFileContents")
				    .detail("Filename", connFile->getFilename())
				    .detail("ConnectionStringFromFile", fileConnectionString.toString())
				    .detail("CurrentConnectionString", connectionString);
			}
		} else {
			incorrectTime = Optional<double>();
		}

		auto peers = FlowTransport::transport().getIncompatiblePeers();
		for (auto it = peers->begin(); it != peers->end();) {
			if (now() - it->second.second > FLOW_KNOBS->INCOMPATIBLE_PEER_DELAY_BEFORE_LOGGING) {
				request.incompatiblePeers.push_back(it->first);
				it = peers->erase(it);
			} else {
				it++;
			}
		}

		state Future<RegisterWorkerReply> registrationReply =
		    ccInterface->get().present()
		        ? brokenPromiseToNever(ccInterface->get().get().registerWorker.getReply(request))
		        : Never();
		state double startTime = now();
		loop choose {
			when(RegisterWorkerReply reply = wait(registrationReply)) {
				processClass = reply.processClass;
				asyncPriorityInfo->set(reply.priorityInfo);
				TraceEvent("WorkerRegisterReply").detail("CCID", ccInterface->get().get().id());
				break;
			}
			when(wait(delay(SERVER_KNOBS->REGISTER_WORKER_REQUEST_TIMEOUT))) {
				TraceEvent(SevWarn, "WorkerRegisterTimeout").detail("WaitTime", now() - startTime);
			}
			when(wait(ccInterface->onChange())) { break; }
			when(wait(ddInterf->onChange())) { break; }
			when(wait(rkInterf->onChange())) { break; }
			when(wait(degraded->onChange())) { break; }
			when(wait(FlowTransport::transport().onIncompatibleChanged())) { break; }
			when(wait(issues->onChange())) { break; }
		}
	}
}

#if (defined(__linux__) || defined(__FreeBSD__)) && defined(USE_GPERFTOOLS)
// A set of threads that should be profiled
std::set<std::thread::id> profiledThreads;

// Returns whether or not a given thread should be profiled
int filter_in_thread(void* arg) {
	return profiledThreads.count(std::this_thread::get_id()) > 0 ? 1 : 0;
}
#endif

// Enables the calling thread to be profiled
void registerThreadForProfiling() {
#if (defined(__linux__) || defined(__FreeBSD__)) && defined(USE_GPERFTOOLS)
	// Not sure if this is actually needed, but a call to backtrace was advised here:
	// http://groups.google.com/group/google-perftools/browse_thread/thread/0dfd74532e038eb8/2686d9f24ac4365f?pli=1
	profiledThreads.insert(std::this_thread::get_id());
	const int num_levels = 100;
	void* pc[num_levels];
	backtrace(pc, num_levels);
#endif
}

// Starts or stops the CPU profiler
void updateCpuProfiler(ProfilerRequest req) {
	switch (req.type) {
	case ProfilerRequest::Type::GPROF:
#if (defined(__linux__) || defined(__FreeBSD__)) && defined(USE_GPERFTOOLS) && !defined(VALGRIND)
		switch (req.action) {
		case ProfilerRequest::Action::ENABLE: {
			const char* path = (const char*)req.outputFile.begin();
			ProfilerOptions* options = new ProfilerOptions();
			options->filter_in_thread = &filter_in_thread;
			options->filter_in_thread_arg = nullptr;
			ProfilerStartWithOptions(path, options);
			break;
		}
		case ProfilerRequest::Action::DISABLE:
			ProfilerStop();
			break;
		case ProfilerRequest::Action::RUN:
			ASSERT(false); // User should have called runProfiler.
			break;
		}
#endif
		break;
	case ProfilerRequest::Type::FLOW:
		switch (req.action) {
		case ProfilerRequest::Action::ENABLE:
			startProfiling(g_network, {}, req.outputFile);
			break;
		case ProfilerRequest::Action::DISABLE:
			stopProfiling();
			break;
		case ProfilerRequest::Action::RUN:
			ASSERT(false); // User should have called runProfiler.
			break;
		}
		break;
	default:
		ASSERT(false);
		break;
	}
}

ACTOR Future<Void> runCpuProfiler(ProfilerRequest req) {
	if (req.action == ProfilerRequest::Action::RUN) {
		req.action = ProfilerRequest::Action::ENABLE;
		updateCpuProfiler(req);
		wait(delay(req.duration));
		req.action = ProfilerRequest::Action::DISABLE;
		updateCpuProfiler(req);
		return Void();
	} else {
		updateCpuProfiler(req);
		return Void();
	}
}

void runHeapProfiler(const char* msg) {
#if defined(__linux__) && defined(USE_GPERFTOOLS) && !defined(VALGRIND)
	if (IsHeapProfilerRunning()) {
		HeapProfilerDump(msg);
	} else {
		TraceEvent("ProfilerError").detail("Message", "HeapProfiler not running");
	}
#else
	TraceEvent("ProfilerError").detail("Message", "HeapProfiler Unsupported");
#endif
}

ACTOR Future<Void> runProfiler(ProfilerRequest req) {
	if (req.type == ProfilerRequest::Type::GPROF_HEAP) {
		runHeapProfiler("User triggered heap dump");
	} else {
		wait(runCpuProfiler(req));
	}

	return Void();
}

bool checkHighMemory(int64_t threshold, bool* error) {
#if defined(__linux__) && defined(USE_GPERFTOOLS) && !defined(VALGRIND)
	*error = false;
	uint64_t page_size = sysconf(_SC_PAGESIZE);
	int fd = open("/proc/self/statm", O_RDONLY | O_CLOEXEC);
	if (fd < 0) {
		TraceEvent("OpenStatmFileFailure");
		*error = true;
		return false;
	}

	const int buf_sz = 256;
	char stat_buf[buf_sz];
	ssize_t stat_nread = read(fd, stat_buf, buf_sz);
	if (stat_nread < 0) {
		TraceEvent("ReadStatmFileFailure");
		*error = true;
		return false;
	}

	uint64_t vmsize, rss;
	sscanf(stat_buf, "%lu %lu", &vmsize, &rss);
	rss *= page_size;
	if (rss >= threshold) {
		return true;
	}
#else
	TraceEvent("CheckHighMemoryUnsupported");
	*error = true;
#endif
	return false;
}

// Runs heap profiler when RSS memory usage is high.
ACTOR Future<Void> monitorHighMemory(int64_t threshold) {
	if (threshold <= 0)
		return Void();

	loop {
		bool err = false;
		bool highmem = checkHighMemory(threshold, &err);
		if (err)
			break;

		if (highmem)
			runHeapProfiler("Highmem heap dump");
		wait(delay(SERVER_KNOBS->HEAP_PROFILER_INTERVAL));
	}
	return Void();
}

ACTOR Future<Void> storageServerRollbackRebooter(Future<Void> prevStorageServer,
                                                 KeyValueStoreType storeType,
                                                 std::string filename,
                                                 UID id,
                                                 LocalityData locality,
                                                 Reference<AsyncVar<ServerDBInfo>> db,
                                                 std::string folder,
                                                 ActorCollection* filesClosed,
                                                 int64_t memoryLimit,
                                                 IKeyValueStore* store) {
	loop {
		ErrorOr<Void> e = wait(errorOr(prevStorageServer));
		if (!e.isError())
			return Void();
		else if (e.getError().code() != error_code_please_reboot)
			throw e.getError();

		TraceEvent("StorageServerRequestedReboot", id);

		StorageServerInterface recruited;
		recruited.uniqueID = id;
		recruited.locality = locality;
		recruited.initEndpoints();

		DUMPTOKEN(recruited.getValue);
		DUMPTOKEN(recruited.getKey);
		DUMPTOKEN(recruited.getKeyValues);
		DUMPTOKEN(recruited.getShardState);
		DUMPTOKEN(recruited.waitMetrics);
		DUMPTOKEN(recruited.splitMetrics);
		DUMPTOKEN(recruited.getReadHotRanges);
		DUMPTOKEN(recruited.getRangeSplitPoints);
		DUMPTOKEN(recruited.getStorageMetrics);
		DUMPTOKEN(recruited.waitFailure);
		DUMPTOKEN(recruited.getQueuingMetrics);
		DUMPTOKEN(recruited.getKeyValueStoreType);
		DUMPTOKEN(recruited.watchValue);

		prevStorageServer =
		    storageServer(store, recruited, db, folder, Promise<Void>(), Reference<ClusterConnectionFile>(nullptr));
		prevStorageServer = handleIOErrors(prevStorageServer, store, id, store->onClosed());
	}
}

ACTOR Future<Void> storageCacheRollbackRebooter(Future<Void> prevStorageCache,
                                                UID id,
                                                LocalityData locality,
                                                Reference<AsyncVar<ServerDBInfo>> db) {
	loop {
		ErrorOr<Void> e = wait(errorOr(prevStorageCache));
		if (!e.isError()) {
			TraceEvent("StorageCacheRequestedReboot1", id);
			return Void();
		} else if (e.getError().code() != error_code_please_reboot &&
		           e.getError().code() != error_code_worker_removed) {
			TraceEvent("StorageCacheRequestedReboot2", id).detail("Code", e.getError().code());
			throw e.getError();
		}

		TraceEvent("StorageCacheRequestedReboot", id);

		StorageServerInterface recruited;
		recruited.uniqueID = deterministicRandom()->randomUniqueID(); // id;
		recruited.locality = locality;
		recruited.initEndpoints();

		DUMPTOKEN(recruited.getValue);
		DUMPTOKEN(recruited.getKey);
		DUMPTOKEN(recruited.getKeyValues);
		DUMPTOKEN(recruited.getShardState);
		DUMPTOKEN(recruited.waitMetrics);
		DUMPTOKEN(recruited.splitMetrics);
		DUMPTOKEN(recruited.getStorageMetrics);
		DUMPTOKEN(recruited.waitFailure);
		DUMPTOKEN(recruited.getQueuingMetrics);
		DUMPTOKEN(recruited.getKeyValueStoreType);
		DUMPTOKEN(recruited.watchValue);

		prevStorageCache = storageCacheServer(recruited, 0, db);
	}
}

// FIXME:  This will not work correctly in simulation as all workers would share the same roles map
std::set<std::pair<std::string, std::string>> g_roles;

Standalone<StringRef> roleString(std::set<std::pair<std::string, std::string>> roles, bool with_ids) {
	std::string result;
	for (auto& r : roles) {
		if (!result.empty())
			result.append(",");
		result.append(r.first);
		if (with_ids) {
			result.append(":");
			result.append(r.second);
		}
	}
	return StringRef(result);
}

void startRole(const Role& role,
               UID roleId,
               UID workerId,
               const std::map<std::string, std::string>& details,
               const std::string& origination) {
	if (role.includeInTraceRoles) {
		addTraceRole(role.abbreviation);
	}

	TraceEvent ev("Role", roleId);
	ev.detail("As", role.roleName)
	    .detail("Transition", "Begin")
	    .detail("Origination", origination)
	    .detail("OnWorker", workerId);
	for (auto it = details.begin(); it != details.end(); it++)
		ev.detail(it->first.c_str(), it->second);

	ev.trackLatest(roleId.shortString() + ".Role");

	// Update roles map, log Roles metrics
	g_roles.insert({ role.roleName, roleId.shortString() });
	StringMetricHandle(LiteralStringRef("Roles")) = roleString(g_roles, false);
	StringMetricHandle(LiteralStringRef("RolesWithIDs")) = roleString(g_roles, true);
	if (g_network->isSimulated())
		g_simulator.addRole(g_network->getLocalAddress(), role.roleName);
}

void endRole(const Role& role, UID id, std::string reason, bool ok, Error e) {
	{
		TraceEvent ev("Role", id);
		if (e.code() != invalid_error_code)
			ev.error(e, true);
		ev.detail("Transition", "End").detail("As", role.roleName).detail("Reason", reason);

		ev.trackLatest(id.shortString() + ".Role");
	}

	if (!ok) {
		std::string type = role.roleName + "Failed";

		TraceEvent err(SevError, type.c_str(), id);
		if (e.code() != invalid_error_code) {
			err.error(e, true);
		}
		err.detail("Reason", reason);
	}

	latestEventCache.clear(id.shortString());

	// Update roles map, log Roles metrics
	g_roles.erase({ role.roleName, id.shortString() });
	StringMetricHandle(LiteralStringRef("Roles")) = roleString(g_roles, false);
	StringMetricHandle(LiteralStringRef("RolesWithIDs")) = roleString(g_roles, true);
	if (g_network->isSimulated())
		g_simulator.removeRole(g_network->getLocalAddress(), role.roleName);

	if (role.includeInTraceRoles) {
		removeTraceRole(role.abbreviation);
	}
}

ACTOR Future<Void> traceRole(Role role, UID roleId) {
	loop {
		wait(delay(SERVER_KNOBS->WORKER_LOGGING_INTERVAL));
		TraceEvent("Role", roleId).detail("Transition", "Refresh").detail("As", role.roleName);
	}
}

ACTOR Future<Void> workerSnapCreate(WorkerSnapRequest snapReq, Standalone<StringRef> snapFolder) {
	state ExecCmdValueString snapArg(snapReq.snapPayload);
	try {
		int err = wait(execHelper(&snapArg, snapReq.snapUID, snapFolder.toString(), snapReq.role.toString()));
		std::string uidStr = snapReq.snapUID.toString();
		TraceEvent("ExecTraceWorker")
		    .detail("Uid", uidStr)
		    .detail("Status", err)
		    .detail("Role", snapReq.role)
		    .detail("Value", snapFolder)
		    .detail("ExecPayload", snapReq.snapPayload);
		if (err != 0) {
			throw operation_failed();
		}
		if (snapReq.role.toString() == "storage") {
			printStorageVersionInfo();
		}
		snapReq.reply.send(Void());
	} catch (Error& e) {
		TraceEvent("ExecHelperError").error(e, true /*includeCancelled*/);
		if (e.code() != error_code_operation_cancelled) {
			snapReq.reply.sendError(e);
		} else {
			throw e;
		}
	}
	return Void();
}

// TODO: `issues` is right now only updated by `monitorTraceLogIssues` and thus is being `set` on every update.
// It could be changed to `insert` and `trigger` later if we want to use it as a generic way for the caller of this
// function to report issues to cluster controller.
ACTOR Future<Void> monitorTraceLogIssues(Reference<AsyncVar<std::set<std::string>>> issues) {
	state bool pingTimeout = false;
	loop {
		wait(delay(SERVER_KNOBS->TRACE_LOG_FLUSH_FAILURE_CHECK_INTERVAL_SECONDS));
		Future<Void> pingAck = pingTraceLogWriterThread();
		try {
			wait(timeoutError(pingAck, SERVER_KNOBS->TRACE_LOG_PING_TIMEOUT_SECONDS));
		} catch (Error& e) {
			if (e.code() == error_code_timed_out) {
				pingTimeout = true;
			} else {
				throw;
			}
		}
		std::set<std::string> _issues;
		retrieveTraceLogIssues(_issues);
		if (pingTimeout) {
			// Ping trace log writer thread timeout.
			_issues.insert("trace_log_writer_thread_unresponsive");
			pingTimeout = false;
		}
		issues->set(_issues);
	}
}

class SharedLogsKey {
	TLogVersion logVersion;
	TLogSpillType spillType;
	KeyValueStoreType storeType;

public:
	SharedLogsKey(const TLogOptions& options, KeyValueStoreType kvst)
	  : logVersion(options.version), spillType(options.spillType), storeType(kvst) {
		if (logVersion >= TLogVersion::V5)
			spillType = TLogSpillType::UNSET;
	}

	bool operator<(const SharedLogsKey& other) const {
		return std::tie(logVersion, spillType, storeType) <
		       std::tie(other.logVersion, other.spillType, other.storeType);
	}
};

struct SharedLogsValue {
	Future<Void> actor = Void();
	UID uid = UID();
	PromiseStream<InitializeTLogRequest> requests;

	SharedLogsValue() = default;
	SharedLogsValue(Future<Void> actor, UID uid, PromiseStream<InitializeTLogRequest> requests)
	  : actor(actor), uid(uid), requests(requests) {}
};

ACTOR Future<Void> workerServer(Reference<ClusterConnectionFile> connFile,
                                Reference<AsyncVar<Optional<ClusterControllerFullInterface>>> ccInterface,
                                LocalityData locality,
                                Reference<AsyncVar<ClusterControllerPriorityInfo>> asyncPriorityInfo,
                                ProcessClass initialClass,
                                std::string folder,
                                int64_t memoryLimit,
                                std::string metricsConnFile,
                                std::string metricsPrefix,
                                Promise<Void> recoveredDiskFiles,
                                int64_t memoryProfileThreshold,
                                std::string _coordFolder,
                                std::string whitelistBinPaths,
                                Reference<AsyncVar<ServerDBInfo>> dbInfo) {
	state PromiseStream<ErrorInfo> errors;
	state Reference<AsyncVar<Optional<DataDistributorInterface>>> ddInterf(
	    new AsyncVar<Optional<DataDistributorInterface>>());
	state Reference<AsyncVar<Optional<RatekeeperInterface>>> rkInterf(new AsyncVar<Optional<RatekeeperInterface>>());
	state Future<Void> handleErrors = workerHandleErrors(errors.getFuture()); // Needs to be stopped last
	state ActorCollection errorForwarders(false);
	state Future<Void> loggingTrigger = Void();
	state double loggingDelay = SERVER_KNOBS->WORKER_LOGGING_INTERVAL;
	state ActorCollection filesClosed(true);
	state Promise<Void> stopping;
	state WorkerCache<InitializeStorageReply> storageCache;
	state Future<Void> metricsLogger;
	state Reference<AsyncVar<bool>> degraded = FlowTransport::transport().getDegraded();
	// tLogFnForOptions() can return a function that doesn't correspond with the FDB version that the
	// TLogVersion represents.  This can be done if the newer TLog doesn't support a requested option.
	// As (store type, spill type) can map to the same TLogFn across multiple TLogVersions, we need to
	// decide if we should collapse them into the same SharedTLog instance as well.  The answer
	// here is no, so that when running with log_version==3, all files should say V=3.
	state std::map<SharedLogsKey, SharedLogsValue> sharedLogs;
	state Reference<AsyncVar<UID>> activeSharedTLog(new AsyncVar<UID>());
	state WorkerCache<InitializeBackupReply> backupWorkerCache;

	state std::string coordFolder = abspath(_coordFolder);

	state WorkerInterface interf(locality);
	interf.initEndpoints();

	state Reference<AsyncVar<std::set<std::string>>> issues(new AsyncVar<std::set<std::string>>());

	folder = abspath(folder);

	if (metricsPrefix.size() > 0) {
		if (metricsConnFile.size() > 0) {
			try {
				state Database db =
				    Database::createDatabase(metricsConnFile, Database::API_VERSION_LATEST, true, locality);
				metricsLogger = runMetrics(db, KeyRef(metricsPrefix));
			} catch (Error& e) {
				TraceEvent(SevWarnAlways, "TDMetricsBadClusterFile").error(e).detail("ConnFile", metricsConnFile);
			}
		} else {
			bool lockAware = metricsPrefix.size() && metricsPrefix[0] == '\xff';
			metricsLogger = runMetrics(openDBOnServer(dbInfo, TaskPriority::DefaultEndpoint, true, lockAware),
			                           KeyRef(metricsPrefix));
		}

		GlobalConfig::globalConfig().trigger(samplingFrequency, samplingProfilerUpdateFrequency);
	}

	errorForwarders.add(resetAfter(degraded,
	                               SERVER_KNOBS->DEGRADED_RESET_INTERVAL,
	                               false,
	                               SERVER_KNOBS->DEGRADED_WARNING_LIMIT,
	                               SERVER_KNOBS->DEGRADED_WARNING_RESET_DELAY,
	                               "DegradedReset"));
	errorForwarders.add(loadedPonger(interf.debugPing.getFuture()));
	errorForwarders.add(waitFailureServer(interf.waitFailure.getFuture()));
	errorForwarders.add(monitorTraceLogIssues(issues));
	errorForwarders.add(testerServerCore(interf.testerInterface, connFile, dbInfo, locality));
	errorForwarders.add(monitorHighMemory(memoryProfileThreshold));

	filesClosed.add(stopping.getFuture());

	initializeSystemMonitorMachineState(SystemMonitorMachineState(
	    folder, locality.dcId(), locality.zoneId(), locality.machineId(), g_network->getLocalAddress().ip));

	{
		auto recruited = interf;
		DUMPTOKEN(recruited.clientInterface.reboot);
		DUMPTOKEN(recruited.clientInterface.profiler);
		DUMPTOKEN(recruited.tLog);
		DUMPTOKEN(recruited.master);
		DUMPTOKEN(recruited.commitProxy);
		DUMPTOKEN(recruited.grvProxy);
		DUMPTOKEN(recruited.resolver);
		DUMPTOKEN(recruited.storage);
		DUMPTOKEN(recruited.debugPing);
		DUMPTOKEN(recruited.coordinationPing);
		DUMPTOKEN(recruited.waitFailure);
		DUMPTOKEN(recruited.setMetricsRate);
		DUMPTOKEN(recruited.eventLogRequest);
		DUMPTOKEN(recruited.traceBatchDumpRequest);
		DUMPTOKEN(recruited.updateServerDBInfo);
	}

	state std::vector<Future<Void>> recoveries;

	try {
		std::vector<DiskStore> stores = getDiskStores(folder);
		bool validateDataFiles = deleteFile(joinPath(folder, validationFilename));
		for (int f = 0; f < stores.size(); f++) {
			DiskStore s = stores[f];
			// FIXME: Error handling
			if (s.storedComponent == DiskStore::Storage) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::Storage;
				IKeyValueStore* kv =
				    openKVStore(s.storeType, s.filename, s.storeID, memoryLimit, false, validateDataFiles);
				Future<Void> kvClosed = kv->onClosed();
				filesClosed.add(kvClosed);

				StorageServerInterface recruited;
				recruited.uniqueID = s.storeID;
				recruited.locality = locality;
				recruited.initEndpoints();

				std::map<std::string, std::string> details;
				details["StorageEngine"] = s.storeType.toString();
				startRole(Role::STORAGE_SERVER, recruited.id(), interf.id(), details, "Restored");

				DUMPTOKEN(recruited.getValue);
				DUMPTOKEN(recruited.getKey);
				DUMPTOKEN(recruited.getKeyValues);
				DUMPTOKEN(recruited.getShardState);
				DUMPTOKEN(recruited.waitMetrics);
				DUMPTOKEN(recruited.splitMetrics);
				DUMPTOKEN(recruited.getReadHotRanges);
				DUMPTOKEN(recruited.getRangeSplitPoints);
				DUMPTOKEN(recruited.getStorageMetrics);
				DUMPTOKEN(recruited.waitFailure);
				DUMPTOKEN(recruited.getQueuingMetrics);
				DUMPTOKEN(recruited.getKeyValueStoreType);
				DUMPTOKEN(recruited.watchValue);

				Promise<Void> recovery;
				Future<Void> f = storageServer(kv, recruited, dbInfo, folder, recovery, connFile);
				recoveries.push_back(recovery.getFuture());
				f = handleIOErrors(f, kv, s.storeID, kvClosed);
				f = storageServerRollbackRebooter(f,
				                                  s.storeType,
				                                  s.filename,
				                                  recruited.id(),
				                                  recruited.locality,
				                                  dbInfo,
				                                  folder,
				                                  &filesClosed,
				                                  memoryLimit,
				                                  kv);
				errorForwarders.add(forwardError(errors, Role::STORAGE_SERVER, recruited.id(), f));
			} else if (s.storedComponent == DiskStore::TLogData) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::TLog;
				std::string logQueueBasename;
				const std::string filename = basename(s.filename);
				if (StringRef(filename).startsWith(fileLogDataPrefix)) {
					logQueueBasename = fileLogQueuePrefix.toString();
				} else {
					StringRef optionsString = StringRef(filename).removePrefix(fileVersionedLogDataPrefix).eat("-");
					logQueueBasename = fileLogQueuePrefix.toString() + optionsString.toString() + "-";
				}
				ASSERT_WE_THINK(abspath(parentDirectory(s.filename)) == folder);
				IKeyValueStore* kv = openKVStore(s.storeType, s.filename, s.storeID, memoryLimit, validateDataFiles);
				const DiskQueueVersion dqv =
				    s.tLogOptions.version >= TLogVersion::V3 ? DiskQueueVersion::V1 : DiskQueueVersion::V0;
				const int64_t diskQueueWarnSize =
				    s.tLogOptions.spillType == TLogSpillType::VALUE ? 10 * SERVER_KNOBS->TARGET_BYTES_PER_TLOG : -1;
				IDiskQueue* queue = openDiskQueue(joinPath(folder, logQueueBasename + s.storeID.toString() + "-"),
				                                  tlogQueueExtension.toString(),
				                                  s.storeID,
				                                  dqv,
				                                  diskQueueWarnSize);
				filesClosed.add(kv->onClosed());
				filesClosed.add(queue->onClosed());

				std::map<std::string, std::string> details;
				details["StorageEngine"] = s.storeType.toString();
				startRole(Role::SHARED_TRANSACTION_LOG, s.storeID, interf.id(), details, "Restored");

				Promise<Void> oldLog;
				Promise<Void> recovery;
				TLogFn tLogFn = tLogFnForOptions(s.tLogOptions);
				auto& logData = sharedLogs[SharedLogsKey(s.tLogOptions, s.storeType)];
				// FIXME: Shouldn't if logData.first isValid && !isReady, shouldn't we
				// be sending a fake InitializeTLogRequest rather than calling tLog() ?
				Future<Void> tl =
				    tLogFn(kv,
				           queue,
				           dbInfo,
				           locality,
				           !logData.actor.isValid() || logData.actor.isReady() ? logData.requests
				                                                               : PromiseStream<InitializeTLogRequest>(),
				           s.storeID,
				           interf.id(),
				           true,
				           oldLog,
				           recovery,
				           folder,
				           degraded,
				           activeSharedTLog);
				recoveries.push_back(recovery.getFuture());
				activeSharedTLog->set(s.storeID);

				tl = handleIOErrors(tl, kv, s.storeID);
				tl = handleIOErrors(tl, queue, s.storeID);
				if (!logData.actor.isValid() || logData.actor.isReady()) {
					logData.actor = oldLog.getFuture() || tl;
					logData.uid = s.storeID;
				}
				errorForwarders.add(forwardError(errors, Role::SHARED_TRANSACTION_LOG, s.storeID, tl));
			}
		}

		bool hasCache = false;
		//  start cache role if we have the right process class
		if (initialClass.classType() == ProcessClass::StorageCacheClass) {
			hasCache = true;
			StorageServerInterface recruited;
			recruited.locality = locality;
			recruited.initEndpoints();

			std::map<std::string, std::string> details;
			startRole(Role::STORAGE_CACHE, recruited.id(), interf.id(), details);

			// DUMPTOKEN(recruited.getVersion);
			DUMPTOKEN(recruited.getValue);
			DUMPTOKEN(recruited.getKey);
			DUMPTOKEN(recruited.getKeyValues);
			DUMPTOKEN(recruited.getShardState);
			DUMPTOKEN(recruited.waitMetrics);
			DUMPTOKEN(recruited.splitMetrics);
			DUMPTOKEN(recruited.getStorageMetrics);
			DUMPTOKEN(recruited.waitFailure);
			DUMPTOKEN(recruited.getQueuingMetrics);
			DUMPTOKEN(recruited.getKeyValueStoreType);
			DUMPTOKEN(recruited.watchValue);

			auto f = storageCacheServer(recruited, 0, dbInfo);
			f = storageCacheRollbackRebooter(f, recruited.id(), recruited.locality, dbInfo);
			errorForwarders.add(forwardError(errors, Role::STORAGE_CACHE, recruited.id(), f));
		}

		std::map<std::string, std::string> details;
		details["Locality"] = locality.toString();
		details["DataFolder"] = folder;
		details["StoresPresent"] = format("%d", stores.size());
		details["CachePresent"] = hasCache ? "true" : "false";
		startRole(Role::WORKER, interf.id(), interf.id(), details);
		errorForwarders.add(traceRole(Role::WORKER, interf.id()));

		wait(waitForAll(recoveries));
		recoveredDiskFiles.send(Void());

		errorForwarders.add(registrationClient(ccInterface,
		                                       interf,
		                                       asyncPriorityInfo,
		                                       initialClass,
		                                       ddInterf,
		                                       rkInterf,
		                                       degraded,
		                                       errors,
		                                       locality,
		                                       dbInfo,
		                                       connFile,
		                                       issues));

		TraceEvent("RecoveriesComplete", interf.id());

		loop choose {
			when(UpdateServerDBInfoRequest req = waitNext(interf.updateServerDBInfo.getFuture())) {
				ServerDBInfo localInfo = BinaryReader::fromStringRef<ServerDBInfo>(
				    req.serializedDbInfo, AssumeVersion(g_network->protocolVersion()));
				localInfo.myLocality = locality;

				if (localInfo.infoGeneration < dbInfo->get().infoGeneration &&
				    localInfo.clusterInterface == dbInfo->get().clusterInterface) {
					std::vector<Endpoint> rep = req.broadcastInfo;
					rep.push_back(interf.updateServerDBInfo.getEndpoint());
					req.reply.send(rep);
				} else {
					Optional<Endpoint> notUpdated;
					if (!ccInterface->get().present() || localInfo.clusterInterface != ccInterface->get().get()) {
						notUpdated = interf.updateServerDBInfo.getEndpoint();
					} else if (localInfo.infoGeneration > dbInfo->get().infoGeneration ||
					           dbInfo->get().clusterInterface != ccInterface->get().get()) {

						TraceEvent("GotServerDBInfoChange")
						    .detail("ChangeID", localInfo.id)
						    .detail("MasterID", localInfo.master.id())
						    .detail("RatekeeperID",
						            localInfo.ratekeeper.present() ? localInfo.ratekeeper.get().id() : UID())
						    .detail("DataDistributorID",
						            localInfo.distributor.present() ? localInfo.distributor.get().id() : UID());
						dbInfo->set(localInfo);
					}
					errorForwarders.add(
					    success(broadcastDBInfoRequest(req, SERVER_KNOBS->DBINFO_SEND_AMOUNT, notUpdated, true)));
				}
			}
			when(RebootRequest req = waitNext(interf.clientInterface.reboot.getFuture())) {
				state RebootRequest rebootReq = req;
				// If suspendDuration is INT_MAX, the trace will not be logged if it was inside the next block
				// Also a useful trace to have even if suspendDuration is 0
				TraceEvent("RebootRequestSuspendingProcess").detail("Duration", req.waitForDuration);
				if (req.waitForDuration) {
					flushTraceFileVoid();
					setProfilingEnabled(0);
					g_network->stop();
					threadSleep(req.waitForDuration);
				}
				if (rebootReq.checkData) {
					Reference<IAsyncFile> checkFile =
					    wait(IAsyncFileSystem::filesystem()->open(joinPath(folder, validationFilename),
					                                              IAsyncFile::OPEN_CREATE | IAsyncFile::OPEN_READWRITE,
					                                              0600));
					wait(checkFile->sync());
				}

				if (g_network->isSimulated()) {
					TraceEvent("SimulatedReboot").detail("Deletion", rebootReq.deleteData);
					if (rebootReq.deleteData) {
						throw please_reboot_delete();
					}
					throw please_reboot();
				} else {
					TraceEvent("ProcessReboot");
					ASSERT(!rebootReq.deleteData);
					flushAndExit(0);
				}
			}
			when(ProfilerRequest req = waitNext(interf.clientInterface.profiler.getFuture())) {
				state ProfilerRequest profilerReq = req;
				// There really isn't a great "filepath sanitizer" or "filepath escape" function available,
				// thus we instead enforce a different requirement.  One can only write to a file that's
				// beneath the working directory, and we remove the ability to do any symlink or ../..
				// tricks by resolving all paths through `abspath` first.
				try {
					std::string realLogDir = abspath(SERVER_KNOBS->LOG_DIRECTORY);
					std::string realOutPath = abspath(realLogDir + "/" + profilerReq.outputFile.toString());
					if (realLogDir.size() < realOutPath.size() &&
					    strncmp(realLogDir.c_str(), realOutPath.c_str(), realLogDir.size()) == 0) {
						profilerReq.outputFile = realOutPath;
						uncancellable(runProfiler(profilerReq));
						profilerReq.reply.send(Void());
					} else {
						profilerReq.reply.sendError(client_invalid_operation());
					}
				} catch (Error& e) {
					profilerReq.reply.sendError(e);
				}
			}
			when(RecruitMasterRequest req = waitNext(interf.master.getFuture())) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::Master;
				MasterInterface recruited;
				recruited.locality = locality;
				recruited.initEndpoints();

				startRole(Role::MASTER, recruited.id(), interf.id());

				DUMPTOKEN(recruited.waitFailure);
				DUMPTOKEN(recruited.tlogRejoin);
				DUMPTOKEN(recruited.changeCoordinators);
				DUMPTOKEN(recruited.getCommitVersion);
				DUMPTOKEN(recruited.getLiveCommittedVersion);
				DUMPTOKEN(recruited.reportLiveCommittedVersion);
				DUMPTOKEN(recruited.notifyBackupWorkerDone);

				// printf("Recruited as masterServer\n");
				Future<Void> masterProcess = masterServer(
				    recruited, dbInfo, ccInterface, ServerCoordinators(connFile), req.lifetime, req.forceRecovery);
				errorForwarders.add(
				    zombie(recruited, forwardError(errors, Role::MASTER, recruited.id(), masterProcess)));
				req.reply.send(recruited);
			}
			when(InitializeDataDistributorRequest req = waitNext(interf.dataDistributor.getFuture())) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::DataDistributor;
				DataDistributorInterface recruited(locality);
				recruited.initEndpoints();

				if (ddInterf->get().present()) {
					recruited = ddInterf->get().get();
					TEST(true); // Recruited while already a data distributor.
				} else {
					startRole(Role::DATA_DISTRIBUTOR, recruited.id(), interf.id());
					DUMPTOKEN(recruited.waitFailure);

					Future<Void> dataDistributorProcess = dataDistributor(recruited, dbInfo);
					errorForwarders.add(forwardError(
					    errors,
					    Role::DATA_DISTRIBUTOR,
					    recruited.id(),
					    setWhenDoneOrError(dataDistributorProcess, ddInterf, Optional<DataDistributorInterface>())));
					ddInterf->set(Optional<DataDistributorInterface>(recruited));
				}
				TraceEvent("DataDistributorReceived", req.reqId).detail("DataDistributorId", recruited.id());
				req.reply.send(recruited);
			}
			when(InitializeRatekeeperRequest req = waitNext(interf.ratekeeper.getFuture())) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::Ratekeeper;
				RatekeeperInterface recruited(locality, req.reqId);
				recruited.initEndpoints();

				if (rkInterf->get().present()) {
					recruited = rkInterf->get().get();
					TEST(true); // Recruited while already a ratekeeper.
				} else {
					startRole(Role::RATEKEEPER, recruited.id(), interf.id());
					DUMPTOKEN(recruited.waitFailure);
					DUMPTOKEN(recruited.getRateInfo);
					DUMPTOKEN(recruited.haltRatekeeper);
					DUMPTOKEN(recruited.reportCommitCostEstimation);

					Future<Void> ratekeeperProcess = ratekeeper(recruited, dbInfo);
					errorForwarders.add(
					    forwardError(errors,
					                 Role::RATEKEEPER,
					                 recruited.id(),
					                 setWhenDoneOrError(ratekeeperProcess, rkInterf, Optional<RatekeeperInterface>())));
					rkInterf->set(Optional<RatekeeperInterface>(recruited));
				}
				TraceEvent("Ratekeeper_InitRequest", req.reqId).detail("RatekeeperId", recruited.id());
				req.reply.send(recruited);
			}
			when(InitializeBackupRequest req = waitNext(interf.backup.getFuture())) {
				if (!backupWorkerCache.exists(req.reqId)) {
					LocalLineage _;
					currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::Backup;
					BackupInterface recruited(locality);
					recruited.initEndpoints();

					startRole(Role::BACKUP, recruited.id(), interf.id());
					DUMPTOKEN(recruited.waitFailure);

					ReplyPromise<InitializeBackupReply> backupReady = req.reply;
					backupWorkerCache.set(req.reqId, backupReady.getFuture());
					Future<Void> backupProcess = backupWorker(recruited, req, dbInfo);
					backupProcess = storageCache.removeOnReady(req.reqId, backupProcess);
					errorForwarders.add(forwardError(errors, Role::BACKUP, recruited.id(), backupProcess));
					TraceEvent("BackupInitRequest", req.reqId).detail("BackupId", recruited.id());
					InitializeBackupReply reply(recruited, req.backupEpoch);
					backupReady.send(reply);
				} else {
					forwardPromise(req.reply, backupWorkerCache.get(req.reqId));
				}
			}
			when(InitializeTLogRequest req = waitNext(interf.tLog.getFuture())) {
				// For now, there's a one-to-one mapping of spill type to TLogVersion.
				// With future work, a particular version of the TLog can support multiple
				// different spilling strategies, at which point SpillType will need to be
				// plumbed down into tLogFn.
				if (req.logVersion < TLogVersion::MIN_RECRUITABLE) {
					TraceEvent(SevError, "InitializeTLogInvalidLogVersion")
					    .detail("Version", req.logVersion)
					    .detail("MinRecruitable", TLogVersion::MIN_RECRUITABLE);
					req.reply.sendError(internal_error());
				}
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::TLog;
				TLogOptions tLogOptions(req.logVersion, req.spillType);
				TLogFn tLogFn = tLogFnForOptions(tLogOptions);
				auto& logData = sharedLogs[SharedLogsKey(tLogOptions, req.storeType)];
				logData.requests.send(req);
				if (!logData.actor.isValid() || logData.actor.isReady()) {
					UID logId = deterministicRandom()->randomUniqueID();
					std::map<std::string, std::string> details;
					details["ForMaster"] = req.recruitmentID.shortString();
					details["StorageEngine"] = req.storeType.toString();

					// FIXME: start role for every tlog instance, rather that just for the shared actor, also use a
					// different role type for the shared actor
					startRole(Role::SHARED_TRANSACTION_LOG, logId, interf.id(), details);

					const StringRef prefix =
					    req.logVersion > TLogVersion::V2 ? fileVersionedLogDataPrefix : fileLogDataPrefix;
					std::string filename =
					    filenameFromId(req.storeType, folder, prefix.toString() + tLogOptions.toPrefix(), logId);
					IKeyValueStore* data = openKVStore(req.storeType, filename, logId, memoryLimit);
					const DiskQueueVersion dqv =
					    tLogOptions.version >= TLogVersion::V3 ? DiskQueueVersion::V1 : DiskQueueVersion::V0;
					IDiskQueue* queue = openDiskQueue(
					    joinPath(folder,
					             fileLogQueuePrefix.toString() + tLogOptions.toPrefix() + logId.toString() + "-"),
					    tlogQueueExtension.toString(),
					    logId,
					    dqv);
					filesClosed.add(data->onClosed());
					filesClosed.add(queue->onClosed());

					Future<Void> tLogCore = tLogFn(data,
					                               queue,
					                               dbInfo,
					                               locality,
					                               logData.requests,
					                               logId,
					                               interf.id(),
					                               false,
					                               Promise<Void>(),
					                               Promise<Void>(),
					                               folder,
					                               degraded,
					                               activeSharedTLog);
					tLogCore = handleIOErrors(tLogCore, data, logId);
					tLogCore = handleIOErrors(tLogCore, queue, logId);
					errorForwarders.add(forwardError(errors, Role::SHARED_TRANSACTION_LOG, logId, tLogCore));
					logData.actor = tLogCore;
					logData.uid = logId;
				}
				activeSharedTLog->set(logData.uid);
			}
			when(InitializeStorageRequest req = waitNext(interf.storage.getFuture())) {
				if (!storageCache.exists(req.reqId)) {
					LocalLineage _;
					currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::Storage;
					StorageServerInterface recruited(req.interfaceId);
					recruited.locality = locality;
					recruited.initEndpoints();

					std::map<std::string, std::string> details;
					details["StorageEngine"] = req.storeType.toString();
					startRole(Role::STORAGE_SERVER, recruited.id(), interf.id(), details);

					DUMPTOKEN(recruited.getValue);
					DUMPTOKEN(recruited.getKey);
					DUMPTOKEN(recruited.getKeyValues);
					DUMPTOKEN(recruited.getShardState);
					DUMPTOKEN(recruited.waitMetrics);
					DUMPTOKEN(recruited.splitMetrics);
					DUMPTOKEN(recruited.getReadHotRanges);
					DUMPTOKEN(recruited.getRangeSplitPoints);
					DUMPTOKEN(recruited.getStorageMetrics);
					DUMPTOKEN(recruited.waitFailure);
					DUMPTOKEN(recruited.getQueuingMetrics);
					DUMPTOKEN(recruited.getKeyValueStoreType);
					DUMPTOKEN(recruited.watchValue);
					// printf("Recruited as storageServer\n");

					std::string filename =
					    filenameFromId(req.storeType, folder, fileStoragePrefix.toString(), recruited.id());
					IKeyValueStore* data = openKVStore(req.storeType, filename, recruited.id(), memoryLimit);
					Future<Void> kvClosed = data->onClosed();
					filesClosed.add(kvClosed);
					ReplyPromise<InitializeStorageReply> storageReady = req.reply;
					storageCache.set(req.reqId, storageReady.getFuture());
					Future<Void> s = storageServer(data, recruited, req.seedTag, storageReady, dbInfo, folder);
					s = handleIOErrors(s, data, recruited.id(), kvClosed);
					s = storageCache.removeOnReady(req.reqId, s);
					s = storageServerRollbackRebooter(s,
					                                  req.storeType,
					                                  filename,
					                                  recruited.id(),
					                                  recruited.locality,
					                                  dbInfo,
					                                  folder,
					                                  &filesClosed,
					                                  memoryLimit,
					                                  data);
					errorForwarders.add(forwardError(errors, Role::STORAGE_SERVER, recruited.id(), s));
				} else
					forwardPromise(req.reply, storageCache.get(req.reqId));
			}
			when(InitializeCommitProxyRequest req = waitNext(interf.commitProxy.getFuture())) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::CommitProxy;
				CommitProxyInterface recruited;
				recruited.processId = locality.processId();
				recruited.provisional = false;
				recruited.initEndpoints();

				std::map<std::string, std::string> details;
				details["ForMaster"] = req.master.id().shortString();
				startRole(Role::COMMIT_PROXY, recruited.id(), interf.id(), details);

				DUMPTOKEN(recruited.commit);
				DUMPTOKEN(recruited.getConsistentReadVersion);
				DUMPTOKEN(recruited.getKeyServersLocations);
				DUMPTOKEN(recruited.getStorageServerRejoinInfo);
				DUMPTOKEN(recruited.waitFailure);
				DUMPTOKEN(recruited.txnState);

				// printf("Recruited as commitProxyServer\n");
				errorForwarders.add(zombie(recruited,
				                           forwardError(errors,
				                                        Role::COMMIT_PROXY,
				                                        recruited.id(),
				                                        commitProxyServer(recruited, req, dbInfo, whitelistBinPaths))));
				req.reply.send(recruited);
			}
			when(InitializeGrvProxyRequest req = waitNext(interf.grvProxy.getFuture())) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::GrvProxy;
				GrvProxyInterface recruited;
				recruited.processId = locality.processId();
				recruited.provisional = false;
				recruited.initEndpoints();

				std::map<std::string, std::string> details;
				details["ForMaster"] = req.master.id().shortString();
				startRole(Role::GRV_PROXY, recruited.id(), interf.id(), details);

				DUMPTOKEN(recruited.getConsistentReadVersion);
				DUMPTOKEN(recruited.waitFailure);
				DUMPTOKEN(recruited.getHealthMetrics);

				// printf("Recruited as grvProxyServer\n");
				errorForwarders.add(zombie(
				    recruited,
				    forwardError(errors, Role::GRV_PROXY, recruited.id(), grvProxyServer(recruited, req, dbInfo))));
				req.reply.send(recruited);
			}
			when(InitializeResolverRequest req = waitNext(interf.resolver.getFuture())) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::Resolver;
				ResolverInterface recruited;
				recruited.locality = locality;
				recruited.initEndpoints();

				std::map<std::string, std::string> details;
				startRole(Role::RESOLVER, recruited.id(), interf.id(), details);

				DUMPTOKEN(recruited.resolve);
				DUMPTOKEN(recruited.metrics);
				DUMPTOKEN(recruited.split);
				DUMPTOKEN(recruited.waitFailure);

				errorForwarders.add(zombie(
				    recruited, forwardError(errors, Role::RESOLVER, recruited.id(), resolver(recruited, req, dbInfo))));
				req.reply.send(recruited);
			}
			when(InitializeLogRouterRequest req = waitNext(interf.logRouter.getFuture())) {
				LocalLineage _;
				currentLineage->modify(&RoleLineage::role) = ProcessClass::ClusterRole::LogRouter;
				TLogInterface recruited(locality);
				recruited.initEndpoints();

				std::map<std::string, std::string> details;
				startRole(Role::LOG_ROUTER, recruited.id(), interf.id(), details);

				DUMPTOKEN(recruited.peekMessages);
				DUMPTOKEN(recruited.popMessages);
				DUMPTOKEN(recruited.commit);
				DUMPTOKEN(recruited.lock);
				DUMPTOKEN(recruited.getQueuingMetrics);
				DUMPTOKEN(recruited.confirmRunning);
				DUMPTOKEN(recruited.waitFailure);
				DUMPTOKEN(recruited.recoveryFinished);
				DUMPTOKEN(recruited.disablePopRequest);
				DUMPTOKEN(recruited.enablePopRequest);
				DUMPTOKEN(recruited.snapRequest);

				errorForwarders.add(
				    zombie(recruited,
				           forwardError(errors, Role::LOG_ROUTER, recruited.id(), logRouter(recruited, req, dbInfo))));
				req.reply.send(recruited);
			}
			when(CoordinationPingMessage m = waitNext(interf.coordinationPing.getFuture())) {
				TraceEvent("CoordinationPing", interf.id())
				    .detail("CCID", m.clusterControllerId)
				    .detail("TimeStep", m.timeStep);
			}
			when(SetMetricsLogRateRequest req = waitNext(interf.setMetricsRate.getFuture())) {
				TraceEvent("LoggingRateChange", interf.id())
				    .detail("OldDelay", loggingDelay)
				    .detail("NewLogPS", req.metricsLogsPerSecond);
				if (req.metricsLogsPerSecond != 0) {
					loggingDelay = 1.0 / req.metricsLogsPerSecond;
					loggingTrigger = Void();
				}
			}
			when(EventLogRequest req = waitNext(interf.eventLogRequest.getFuture())) {
				TraceEventFields e;
				if (req.getLastError)
					e = latestEventCache.getLatestError();
				else
					e = latestEventCache.get(req.eventName.toString());
				req.reply.send(e);
			}
			when(TraceBatchDumpRequest req = waitNext(interf.traceBatchDumpRequest.getFuture())) {
				g_traceBatch.dump();
				req.reply.send(Void());
			}
			when(DiskStoreRequest req = waitNext(interf.diskStoreRequest.getFuture())) {
				Standalone<VectorRef<UID>> ids;
				for (DiskStore d : getDiskStores(folder)) {
					bool included = true;
					if (!req.includePartialStores) {
						if (d.storeType == KeyValueStoreType::SSD_BTREE_V1) {
							included = fileExists(d.filename + ".fdb-wal");
						} else if (d.storeType == KeyValueStoreType::SSD_BTREE_V2) {
							included = fileExists(d.filename + ".sqlite-wal");
						} else if (d.storeType == KeyValueStoreType::SSD_REDWOOD_V1) {
							included = fileExists(d.filename + "0.pagerlog") && fileExists(d.filename + "1.pagerlog");
						} else if (d.storeType == KeyValueStoreType::SSD_ROCKSDB_V1) {
							included = fileExists(joinPath(d.filename, "CURRENT")) &&
							           fileExists(joinPath(d.filename, "IDENTITY"));
						} else if (d.storeType == KeyValueStoreType::MEMORY) {
							included = fileExists(d.filename + "1.fdq");
						} else {
							ASSERT(d.storeType == KeyValueStoreType::MEMORY_RADIXTREE);
							included = fileExists(d.filename + "1.fdr");
						}
						if (d.storedComponent == DiskStore::COMPONENT::TLogData && included) {
							included = false;
							// The previous code assumed that d.filename is a filename.  But that is not true.
							// d.filename is a path. Removing a prefix and adding a new one just makes a broken
							// directory name.  So fileExists would always return false.
							// Weirdly, this doesn't break anything, as tested by taking a clean check of FDB,
							// setting included to false always, and then running correctness.  So I'm just
							// improving the situation by actually marking it as broken.
							// FIXME: this whole thing
							/*
							std::string logDataBasename;
							StringRef filename = d.filename;
							if (filename.startsWith(fileLogDataPrefix)) {
							    logDataBasename = fileLogQueuePrefix.toString() +
							d.filename.substr(fileLogDataPrefix.size()); } else { StringRef optionsString =
							filename.removePrefix(fileVersionedLogDataPrefix).eat("-"); logDataBasename =
							fileLogQueuePrefix.toString() + optionsString.toString() + "-";
							}
							TraceEvent("DiskStoreRequest").detail("FilenameBasename", logDataBasename);
							if (fileExists(logDataBasename + "0.fdq") && fileExists(logDataBasename + "1.fdq")) {
							    included = true;
							}
							*/
						}
					}
					if (included) {
						ids.push_back(ids.arena(), d.storeID);
					}
				}
				req.reply.send(ids);
			}
			when(wait(loggingTrigger)) {
				systemMonitor();
				loggingTrigger = delay(loggingDelay, TaskPriority::FlushTrace);
			}
			when(state WorkerSnapRequest snapReq = waitNext(interf.workerSnapReq.getFuture())) {
				Standalone<StringRef> snapFolder = StringRef(folder);
				if (snapReq.role.toString() == "coord") {
					snapFolder = coordFolder;
				}
				errorForwarders.add(workerSnapCreate(snapReq, snapFolder));
			}
			when(wait(errorForwarders.getResult())) {}
			when(wait(handleErrors)) {}
		}
	} catch (Error& err) {
		// Make sure actors are cancelled before "recovery" promises are destructed.
		for (auto f : recoveries)
			f.cancel();
		state Error e = err;
		bool ok = e.code() == error_code_please_reboot || e.code() == error_code_actor_cancelled ||
		          e.code() == error_code_please_reboot_delete;

		endRole(Role::WORKER, interf.id(), "WorkerError", ok, e);
		errorForwarders.clear(false);
		sharedLogs.clear();

		if (e.code() !=
		    error_code_actor_cancelled) { // We get cancelled e.g. when an entire simulation times out, but in that case
			                              // we won't be restarted and don't need to wait for shutdown
			stopping.send(Void());
			wait(filesClosed.getResult()); // Wait for complete shutdown of KV stores
			wait(delay(0.0)); // Unwind the callstack to make sure that IAsyncFile references are all gone
			TraceEvent(SevInfo, "WorkerShutdownComplete", interf.id());
		}

		throw e;
	}
}

ACTOR Future<Void> extractClusterInterface(Reference<AsyncVar<Optional<ClusterControllerFullInterface>>> a,
                                           Reference<AsyncVar<Optional<ClusterInterface>>> b) {
	loop {
		if (a->get().present())
			b->set(a->get().get().clientInterface);
		else
			b->set(Optional<ClusterInterface>());
		wait(a->onChange());
	}
}

static std::set<int> const& normalWorkerErrors() {
	static std::set<int> s;
	if (s.empty()) {
		s.insert(error_code_please_reboot);
		s.insert(error_code_please_reboot_delete);
	}
	return s;
}

ACTOR Future<Void> fileNotFoundToNever(Future<Void> f) {
	try {
		wait(f);
		return Void();
	} catch (Error& e) {
		if (e.code() == error_code_file_not_found) {
			TraceEvent(SevWarn, "ClusterCoordinatorFailed").error(e);
			return Never();
		}
		throw;
	}
}

ACTOR Future<Void> printTimeout() {
	wait(delay(5));
	if (!g_network->isSimulated()) {
		fprintf(stderr, "Warning: FDBD has not joined the cluster after 5 seconds.\n");
		fprintf(stderr, "  Check configuration and availability using the 'status' command with the fdbcli\n");
	}
	return Void();
}

ACTOR Future<Void> printOnFirstConnected(Reference<AsyncVar<Optional<ClusterInterface>>> ci) {
	state Future<Void> timeoutFuture = printTimeout();
	loop {
		choose {
			when(wait(ci->get().present() ? IFailureMonitor::failureMonitor().onStateEqual(
			                                    ci->get().get().openDatabase.getEndpoint(), FailureStatus(false))
			                              : Never())) {
				printf("FDBD joined cluster.\n");
				TraceEvent("FDBDConnected");
				return Void();
			}
			when(wait(ci->onChange())) {}
		}
	}
}

ClusterControllerPriorityInfo getCCPriorityInfo(std::string filePath, ProcessClass processClass) {
	if (!fileExists(filePath))
		return ClusterControllerPriorityInfo(ProcessClass(processClass.classType(), ProcessClass::CommandLineSource)
		                                         .machineClassFitness(ProcessClass::ClusterController),
		                                     false,
		                                     ClusterControllerPriorityInfo::FitnessUnknown);
	std::string contents(readFileBytes(filePath, 1000));
	BinaryReader br(StringRef(contents), IncludeVersion());
	ClusterControllerPriorityInfo priorityInfo(
	    ProcessClass::UnsetFit, false, ClusterControllerPriorityInfo::FitnessUnknown);
	br >> priorityInfo;
	if (!br.empty()) {
		if (g_network->isSimulated()) {
			ASSERT(false);
		} else {
			TraceEvent(SevWarnAlways, "FitnessFileCorrupted").detail("filePath", filePath);
			return ClusterControllerPriorityInfo(ProcessClass(processClass.classType(), ProcessClass::CommandLineSource)
			                                         .machineClassFitness(ProcessClass::ClusterController),
			                                     false,
			                                     ClusterControllerPriorityInfo::FitnessUnknown);
		}
	}
	return priorityInfo;
}

ACTOR Future<Void> monitorAndWriteCCPriorityInfo(std::string filePath,
                                                 Reference<AsyncVar<ClusterControllerPriorityInfo>> asyncPriorityInfo) {
	loop {
		wait(asyncPriorityInfo->onChange());
		std::string contents(BinaryWriter::toValue(asyncPriorityInfo->get(),
		                                           IncludeVersion(ProtocolVersion::withClusterControllerPriorityInfo()))
		                         .toString());
		atomicReplace(filePath, contents, false);
	}
}

ACTOR Future<UID> createAndLockProcessIdFile(std::string folder) {
	state UID processIDUid;
	platform::createDirectory(folder);

	loop {
		try {
			state std::string lockFilePath = joinPath(folder, "processId");
			state ErrorOr<Reference<IAsyncFile>> lockFile = wait(errorOr(IAsyncFileSystem::filesystem(g_network)->open(
			    lockFilePath, IAsyncFile::OPEN_READWRITE | IAsyncFile::OPEN_LOCK, 0600)));

			if (lockFile.isError() && lockFile.getError().code() == error_code_file_not_found &&
			    !fileExists(lockFilePath)) {
				Reference<IAsyncFile> _lockFile = wait(IAsyncFileSystem::filesystem()->open(
				    lockFilePath,
				    IAsyncFile::OPEN_ATOMIC_WRITE_AND_CREATE | IAsyncFile::OPEN_CREATE | IAsyncFile::OPEN_LOCK |
				        IAsyncFile::OPEN_READWRITE,
				    0600));
				lockFile = _lockFile;
				processIDUid = deterministicRandom()->randomUniqueID();
				BinaryWriter wr(IncludeVersion(ProtocolVersion::withProcessIDFile()));
				wr << processIDUid;
				wait(lockFile.get()->write(wr.getData(), wr.getLength(), 0));
				wait(lockFile.get()->sync());
			} else {
				if (lockFile.isError())
					throw lockFile.getError(); // If we've failed to open the file, throw an exception

				int64_t fileSize = wait(lockFile.get()->size());
				state Key fileData = makeString(fileSize);
				wait(success(lockFile.get()->read(mutateString(fileData), fileSize, 0)));
				try {
					processIDUid = BinaryReader::fromStringRef<UID>(fileData, IncludeVersion());
					return processIDUid;
				} catch (Error& e) {
					if (!g_network->isSimulated()) {
						throw;
					}
					lockFile = ErrorOr<Reference<IAsyncFile>>();
					wait(IAsyncFileSystem::filesystem()->deleteFile(lockFilePath, true));
				}
			}
		} catch (Error& e) {
			if (e.code() == error_code_actor_cancelled) {
				throw;
			}
			if (!e.isInjectedFault()) {
				fprintf(stderr,
				        "ERROR: error creating or opening process id file `%s'.\n",
				        joinPath(folder, "processId").c_str());
			}
			TraceEvent(SevError, "OpenProcessIdError").error(e);
			throw;
		}
	}
}

ACTOR Future<MonitorLeaderInfo> monitorLeaderRemotelyOneGeneration(Reference<ClusterConnectionFile> connFile,
                                                                   Reference<AsyncVar<Value>> result,
                                                                   MonitorLeaderInfo info) {
	state ClusterConnectionString ccf = info.intermediateConnFile->getConnectionString();
	state vector<NetworkAddress> addrs = ccf.coordinators();
	state ElectionResultRequest request;
	state int index = 0;
	state int successIndex = 0;
	request.key = ccf.clusterKey();
	request.coordinators = ccf.coordinators();

	deterministicRandom()->randomShuffle(addrs);

	loop {
		LeaderElectionRegInterface interf(addrs[index]);
		request.reply = ReplyPromise<Optional<LeaderInfo>>();

		ErrorOr<Optional<LeaderInfo>> leader = wait(interf.electionResult.tryGetReply(request));
		if (leader.present()) {
			if (leader.get().present()) {
				if (leader.get().get().forward) {
					info.intermediateConnFile = makeReference<ClusterConnectionFile>(
					    connFile->getFilename(), ClusterConnectionString(leader.get().get().serializedInfo.toString()));
					return info;
				}
				if (connFile != info.intermediateConnFile) {
					if (!info.hasConnected) {
						TraceEvent(SevWarnAlways, "IncorrectClusterFileContentsAtConnection")
						    .detail("Filename", connFile->getFilename())
						    .detail("ConnectionStringFromFile", connFile->getConnectionString().toString())
						    .detail("CurrentConnectionString",
						            info.intermediateConnFile->getConnectionString().toString());
					}
					connFile->setConnectionString(info.intermediateConnFile->getConnectionString());
					info.intermediateConnFile = connFile;
				}

				info.hasConnected = true;
				connFile->notifyConnected();
				request.knownLeader = leader.get().get().changeID;

				ClusterControllerPriorityInfo info = leader.get().get().getPriorityInfo();
				if (leader.get().get().serializedInfo.size() && !info.isExcluded &&
				    (info.dcFitness == ClusterControllerPriorityInfo::FitnessPrimary ||
				     info.dcFitness == ClusterControllerPriorityInfo::FitnessPreferred ||
				     info.dcFitness == ClusterControllerPriorityInfo::FitnessUnknown)) {
					result->set(leader.get().get().serializedInfo);
				} else {
					result->set(Value());
				}
			}
			successIndex = index;
		} else {
			index = (index + 1) % addrs.size();
			if (index == successIndex) {
				wait(delay(CLIENT_KNOBS->COORDINATOR_RECONNECTION_DELAY));
			}
		}
	}
}

ACTOR Future<Void> monitorLeaderRemotelyInternal(Reference<ClusterConnectionFile> connFile,
                                                 Reference<AsyncVar<Value>> outSerializedLeaderInfo) {
	state MonitorLeaderInfo info(connFile);
	loop {
		MonitorLeaderInfo _info = wait(monitorLeaderRemotelyOneGeneration(connFile, outSerializedLeaderInfo, info));
		info = _info;
	}
}

template <class LeaderInterface>
Future<Void> monitorLeaderRemotely(Reference<ClusterConnectionFile> const& connFile,
                                   Reference<AsyncVar<Optional<LeaderInterface>>> const& outKnownLeader) {
	LeaderDeserializer<LeaderInterface> deserializer;
	auto serializedInfo = makeReference<AsyncVar<Value>>();
	Future<Void> m = monitorLeaderRemotelyInternal(connFile, serializedInfo);
	return m || deserializer(serializedInfo, outKnownLeader);
}

ACTOR Future<Void> monitorLeaderRemotelyWithDelayedCandidacy(
    Reference<ClusterConnectionFile> connFile,
    Reference<AsyncVar<Optional<ClusterControllerFullInterface>>> currentCC,
    Reference<AsyncVar<ClusterControllerPriorityInfo>> asyncPriorityInfo,
    Future<Void> recoveredDiskFiles,
    LocalityData locality,
    Reference<AsyncVar<ServerDBInfo>> dbInfo) {
	state Future<Void> monitor = monitorLeaderRemotely(connFile, currentCC);
	state Future<Void> timeout;

	wait(recoveredDiskFiles);

	loop {
		if (currentCC->get().present() && dbInfo->get().clusterInterface == currentCC->get().get() &&
		    IFailureMonitor::failureMonitor()
		        .getState(currentCC->get().get().registerWorker.getEndpoint())
		        .isAvailable()) {
			timeout = Future<Void>();
		} else if (!timeout.isValid()) {
			timeout =
			    delay(SERVER_KNOBS->MIN_DELAY_CC_WORST_FIT_CANDIDACY_SECONDS +
			          (deterministicRandom()->random01() * (SERVER_KNOBS->MAX_DELAY_CC_WORST_FIT_CANDIDACY_SECONDS -
			                                                SERVER_KNOBS->MIN_DELAY_CC_WORST_FIT_CANDIDACY_SECONDS)));
		}
		choose {
			when(wait(currentCC->onChange())) {}
			when(wait(dbInfo->onChange())) {}
			when(wait(currentCC->get().present() ? IFailureMonitor::failureMonitor().onStateChanged(
			                                           currentCC->get().get().registerWorker.getEndpoint())
			                                     : Never())) {}
			when(wait(timeout.isValid() ? timeout : Never())) {
				monitor.cancel();
				wait(clusterController(connFile, currentCC, asyncPriorityInfo, recoveredDiskFiles, locality));
				return Void();
			}
		}
	}
}

extern void setupStackSignal();

ACTOR Future<Void> serveProtocolInfo() {
	state RequestStream<ProtocolInfoRequest> protocolInfo(
	    PeerCompatibilityPolicy{ RequirePeer::AtLeast, ProtocolVersion::withStableInterfaces() });
	protocolInfo.makeWellKnownEndpoint(WLTOKEN_PROTOCOL_INFO, TaskPriority::DefaultEndpoint);
	loop {
		state ProtocolInfoRequest req = waitNext(protocolInfo.getFuture());
		req.reply.send(ProtocolInfoReply{ g_network->protocolVersion() });
	}
}

// Handles requests from ProcessInterface, an interface meant for direct
// communication between the client and FDB processes.
ACTOR Future<Void> serveProcess() {
	state ProcessInterface process;
	process.getInterface.makeWellKnownEndpoint(WLTOKEN_PROCESS, TaskPriority::DefaultEndpoint);
	loop {
		choose {
			when(GetProcessInterfaceRequest req = waitNext(process.getInterface.getFuture())) {
				req.reply.send(process);
			}
			when(ActorLineageRequest req = waitNext(process.actorLineage.getFuture())) {
				state SampleCollection sampleCollector;
				auto samples = sampleCollector->get(req.timeStart, req.timeEnd);

				std::vector<SerializedSample> serializedSamples;
				for (const auto& samplePtr : samples) {
					auto serialized = SerializedSample{ .time = samplePtr->time };
					for (const auto& [waitState, pair] : samplePtr->data) {
						if (waitState >= req.waitStateStart && waitState <= req.waitStateEnd) {
							serialized.data[waitState] = std::string(pair.first, pair.second);
						}
					}
					serializedSamples.push_back(std::move(serialized));
				}
				ActorLineageReply reply{ serializedSamples };
				req.reply.send(reply);
			}
		}
	}
}

ACTOR Future<Void> fdbd(Reference<ClusterConnectionFile> connFile,
                        LocalityData localities,
                        ProcessClass processClass,
                        std::string dataFolder,
                        std::string coordFolder,
                        int64_t memoryLimit,
                        std::string metricsConnFile,
                        std::string metricsPrefix,
                        int64_t memoryProfileThreshold,
                        std::string whitelistBinPaths) {
	state vector<Future<Void>> actors;
	state Promise<Void> recoveredDiskFiles;
	setupStackSignal();
	currentLineage->modify(&RoleLineage::role) = ProcessClass::Worker;

	actors.push_back(serveProtocolInfo());
	actors.push_back(serveProcess());

	try {
		ServerCoordinators coordinators(connFile);
		if (g_network->isSimulated()) {
			whitelistBinPaths = ",, random_path,  /bin/snap_create.sh,,";
		}
		TraceEvent("StartingFDBD")
		    .detail("ZoneID", localities.zoneId())
		    .detail("MachineId", localities.machineId())
		    .detail("DiskPath", dataFolder)
		    .detail("CoordPath", coordFolder)
		    .detail("WhiteListBinPath", whitelistBinPaths);

		// SOMEDAY: start the services on the machine in a staggered fashion in simulation?
		// Endpoints should be registered first before any process trying to connect to it.
		// So coordinationServer actor should be the first one executed before any other.
		if (coordFolder.size()) {
			// SOMEDAY: remove the fileNotFound wrapper and make DiskQueue construction safe from errors setting up
			// their files
			actors.push_back(fileNotFoundToNever(coordinationServer(coordFolder)));
		}

		state UID processIDUid = wait(createAndLockProcessIdFile(dataFolder));
		localities.set(LocalityData::keyProcessId, processIDUid.toString());
		// Only one process can execute on a dataFolder from this point onwards

		std::string fitnessFilePath = joinPath(dataFolder, "fitness");
		auto cc = makeReference<AsyncVar<Optional<ClusterControllerFullInterface>>>();
		auto ci = makeReference<AsyncVar<Optional<ClusterInterface>>>();
		auto asyncPriorityInfo =
		    makeReference<AsyncVar<ClusterControllerPriorityInfo>>(getCCPriorityInfo(fitnessFilePath, processClass));
		auto dbInfo = makeReference<AsyncVar<ServerDBInfo>>();

		actors.push_back(reportErrors(monitorAndWriteCCPriorityInfo(fitnessFilePath, asyncPriorityInfo),
		                              "MonitorAndWriteCCPriorityInfo"));
		if (processClass.machineClassFitness(ProcessClass::ClusterController) == ProcessClass::NeverAssign) {
			actors.push_back(reportErrors(monitorLeader(connFile, cc), "ClusterController"));
		} else if (processClass.machineClassFitness(ProcessClass::ClusterController) == ProcessClass::WorstFit &&
		           SERVER_KNOBS->MAX_DELAY_CC_WORST_FIT_CANDIDACY_SECONDS > 0) {
			actors.push_back(
			    reportErrors(monitorLeaderRemotelyWithDelayedCandidacy(
			                     connFile, cc, asyncPriorityInfo, recoveredDiskFiles.getFuture(), localities, dbInfo),
			                 "ClusterController"));
		} else {
			actors.push_back(reportErrors(
			    clusterController(connFile, cc, asyncPriorityInfo, recoveredDiskFiles.getFuture(), localities),
			    "ClusterController"));
		}
		actors.push_back(reportErrors(extractClusterInterface(cc, ci), "ExtractClusterInterface"));
		actors.push_back(reportErrorsExcept(workerServer(connFile,
		                                                 cc,
		                                                 localities,
		                                                 asyncPriorityInfo,
		                                                 processClass,
		                                                 dataFolder,
		                                                 memoryLimit,
		                                                 metricsConnFile,
		                                                 metricsPrefix,
		                                                 recoveredDiskFiles,
		                                                 memoryProfileThreshold,
		                                                 coordFolder,
		                                                 whitelistBinPaths,
		                                                 dbInfo),
		                                    "WorkerServer",
		                                    UID(),
		                                    &normalWorkerErrors()));
		state Future<Void> firstConnect = reportErrors(printOnFirstConnected(ci), "ClusterFirstConnectedError");

		wait(quorum(actors, 1));
		ASSERT(false); // None of these actors should terminate normally
		throw internal_error();
	} catch (Error& e) {
		// Make sure actors are cancelled before recoveredDiskFiles is destructed.
		// Otherwise, these actors may get a broken promise error.
		for (auto f : actors)
			f.cancel();
		Error err = checkIOTimeout(e);
		throw err;
	}
}

const Role Role::WORKER("Worker", "WK", false);
const Role Role::STORAGE_SERVER("StorageServer", "SS");
const Role Role::TRANSACTION_LOG("TLog", "TL");
const Role Role::SHARED_TRANSACTION_LOG("SharedTLog", "SL", false);
const Role Role::COMMIT_PROXY("CommitProxyServer", "CP");
const Role Role::GRV_PROXY("GrvProxyServer", "GP");
const Role Role::MASTER("MasterServer", "MS");
const Role Role::RESOLVER("Resolver", "RV");
const Role Role::CLUSTER_CONTROLLER("ClusterController", "CC");
const Role Role::TESTER("Tester", "TS");
const Role Role::LOG_ROUTER("LogRouter", "LR");
const Role Role::DATA_DISTRIBUTOR("DataDistributor", "DD");
const Role Role::RATEKEEPER("Ratekeeper", "RK");
const Role Role::STORAGE_CACHE("StorageCache", "SC");
const Role Role::COORDINATOR("Coordinator", "CD");
const Role Role::BACKUP("Backup", "BK");
