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foundationdb/fdbserver/workloads/RemoveServersSafely.actor.cpp

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/*
* RemoveServersSafely.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 "fdbclient/NativeAPI.actor.h"
#include "fdbserver/TesterInterface.actor.h"
#include "fdbserver/WorkerInterface.actor.h"
#include "fdbserver/workloads/workloads.actor.h"
#include "fdbrpc/simulator.h"
#include "fdbclient/ManagementAPI.actor.h"
#include "flow/actorcompiler.h" // This must be the last #include.
template <>
std::string describe(uint32_t const& item) {
return format("%d", item);
}
struct RemoveServersSafelyWorkload : TestWorkload {
bool enabled, killProcesses;
int minMachinesToKill, maxMachinesToKill, maxSafetyCheckRetries;
double minDelay, maxDelay;
double kill1Timeout, kill2Timeout;
std::set<AddressExclusion> toKill1, toKill2;
std::map<AddressExclusion, Optional<Standalone<StringRef>>> machine_ids; // ip -> Locality Zone id
std::map<AddressExclusion, std::set<AddressExclusion>> machineProcesses; // ip -> ip:port
RemoveServersSafelyWorkload(WorkloadContext const& wcx) : TestWorkload(wcx) {
enabled =
!clientId && g_network->isSimulated(); // only do this on the "first" client, and only when in simulation
minMachinesToKill = getOption(options, LiteralStringRef("minMachinesToKill"), 1);
maxMachinesToKill = getOption(options, LiteralStringRef("maxMachinesToKill"), 10);
maxMachinesToKill = std::max(minMachinesToKill, maxMachinesToKill);
maxSafetyCheckRetries = getOption(options, LiteralStringRef("maxSafetyCheckRetries"), 50);
minDelay = getOption(options, LiteralStringRef("minDelay"), 0.0);
maxDelay = getOption(options, LiteralStringRef("maxDelay"), 60.0);
kill1Timeout = getOption(options, LiteralStringRef("kill1Timeout"), 60.0);
kill2Timeout = getOption(options, LiteralStringRef("kill2Timeout"), 6000.0);
killProcesses = deterministicRandom()->random01() < 0.5;
if (g_network->isSimulated()) {
g_simulator.allowLogSetKills = false;
}
}
std::string description() const override { return "RemoveServersSafelyWorkload"; }
Future<Void> setup(Database const& cx) override {
if (!enabled)
return Void();
std::map<Optional<Standalone<StringRef>>, AddressExclusion> machinesMap; // Locality Zone Id -> ip address
std::vector<AddressExclusion>
processAddrs; // IF (killProcesses) THEN ip:port ELSE ip addresses unique list of the machines
std::map<IPAddress, Optional<Standalone<StringRef>>> ip_dcid;
auto processes = getServers();
for (auto& it : processes) {
AddressExclusion machineIp(it->address.ip);
AddressExclusion pAddr(it->address.ip, it->address.port);
TraceEvent("RemoveAndKill")
.detail("Step", "listAddresses")
.detail("Address", pAddr.toString())
.detail("Process", describe(*it))
.detail("Dcid", it->locality.dcId().get().toString())
.detail("Zoneid", it->locality.zoneId().get().toString())
.detail("MachineId", it->locality.machineId().get().toString());
if (g_simulator.protectedAddresses.count(it->address) == 0)
processAddrs.push_back(pAddr);
machineProcesses[machineIp].insert(pAddr);
// add only one entry for each machine
if (!machinesMap.count(it->locality.zoneId()))
machinesMap[it->locality.zoneId()] = machineIp;
machine_ids[machineIp] = it->locality.zoneId();
ip_dcid[it->address.ip] = it->locality.dcId();
}
int processCount = processAddrs.size();
int nToKill1 = deterministicRandom()->randomInt(std::min(processCount, minMachinesToKill),
std::min(processCount, maxMachinesToKill) + 1);
int nToKill2 = deterministicRandom()->randomInt(std::min(processCount, minMachinesToKill),
std::min(processCount, maxMachinesToKill) + 1);
toKill1 = random_subset(processAddrs, nToKill1);
toKill2 = random_subset(processAddrs, nToKill2);
if (!killProcesses) {
std::set<AddressExclusion> processSet;
for (auto k1 : toKill1) {
AddressExclusion machineIp(k1.ip);
ASSERT(machineProcesses.count(machineIp));
// kill all processes on this machine even if it has a different ip address
std::copy(machineProcesses[machineIp].begin(),
machineProcesses[machineIp].end(),
std::inserter(processSet, processSet.end()));
}
toKill1.insert(processSet.begin(), processSet.end());
processSet.clear();
for (auto k2 : toKill2) {
AddressExclusion machineIp(k2.ip);
ASSERT(machineProcesses.count(machineIp));
std::copy(machineProcesses[machineIp].begin(),
machineProcesses[machineIp].end(),
std::inserter(processSet, processSet.end()));
}
toKill2.insert(processSet.begin(), processSet.end());
}
for (AddressExclusion ex : toKill1) {
AddressExclusion machineIp(ex.ip);
ASSERT(machine_ids.count(machineIp));
g_simulator.disableSwapToMachine(machine_ids[machineIp]);
}
for (AddressExclusion ex : toKill2) {
AddressExclusion machineIp(ex.ip);
ASSERT(machine_ids.count(machineIp));
g_simulator.disableSwapToMachine(machine_ids[machineIp]);
}
return Void();
}
Future<Void> start(Database const& cx) override {
if (!enabled)
return Void();
double delay = deterministicRandom()->random01() * (maxDelay - minDelay) + minDelay;
return workloadMain(this, cx, delay, toKill1, toKill2);
}
Future<bool> check(Database const& cx) override { return true; }
void getMetrics(std::vector<PerfMetric>&) override {}
std::set<AddressExclusion> getNetworks(std::vector<ISimulator::ProcessInfo*> const& processes) {
std::set<AddressExclusion> processAddrs;
for (auto& processInfo : processes) {
processAddrs.insert(AddressExclusion(processInfo->address.ip, processInfo->address.port));
}
return processAddrs;
}
// Get the list of processes whose ip:port or ip matches netAddrs.
// Note: item in netAddrs may be ip (representing a machine) or ip:port (representing a process)
std::vector<ISimulator::ProcessInfo*> getProcesses(std::set<AddressExclusion> const& netAddrs) {
std::vector<ISimulator::ProcessInfo*> processes;
std::set<AddressExclusion> processAddrs;
UID functionId = nondeterministicRandom()->randomUniqueID();
// Get the list of process network addresses
for (auto& netAddr : netAddrs) {
auto machineIpPorts = machineProcesses.find(netAddr);
if (machineIpPorts != machineProcesses.end()) {
ASSERT(machineIpPorts->second.size());
for (auto& processAdd : machineIpPorts->second)
processAddrs.insert(processAdd);
} else {
processAddrs.insert(netAddr);
}
}
// Get the list of processes matching network address
for (auto processInfo : g_simulator.getAllProcesses()) {
auto processNet = AddressExclusion(processInfo->address.ip, processInfo->address.port);
if (processAddrs.find(processNet) != processAddrs.end()) {
processes.push_back(processInfo);
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "ProcessToKill")
.detail("ProcessAddress", processInfo->address)
.detail("Process", describe(*processInfo))
.detail("Failed", processInfo->failed)
.detail("Excluded", processInfo->excluded)
.detail("Rebooting", processInfo->rebooting)
.detail("Protected", g_simulator.protectedAddresses.count(processInfo->address));
} else {
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "ProcessNotToKill")
.detail("ProcessAddress", processInfo->address)
.detail("Process", describe(*processInfo))
.detail("Failed", processInfo->failed)
.detail("Excluded", processInfo->excluded)
.detail("Rebooting", processInfo->rebooting)
.detail("Protected", g_simulator.protectedAddresses.count(processInfo->address));
}
}
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "getProcesses")
.detail("NetAddrSize", netAddrs.size())
.detail("ProcessAddrSize", processAddrs.size())
.detail("NetAddrs", describe(netAddrs))
.detail("ProcessAddrs", describe(processAddrs))
.detail("Proceses", processes.size())
.detail("MachineProcesses", machineProcesses.size());
return processes;
}
std::vector<ISimulator::ProcessInfo*> excludeAddresses(std::set<AddressExclusion> const& procAddrs) {
// Get the updated list of processes which may have changed due to reboots, deletes, etc
std::vector<ISimulator::ProcessInfo*> procArray = getProcesses(procAddrs);
// Include all of the excluded machines because the first command of the next section is includeall
TraceEvent("RemoveAndKill")
.detail("Step", "exclude addresses")
.detail("AddrTotal", procAddrs.size())
.detail("ProcTotal", procArray.size())
.detail("Addresses", describe(procAddrs))
.detail("ClusterAvailable", g_simulator.isAvailable());
for (auto& procAddr : procAddrs) {
g_simulator.excludeAddress(NetworkAddress(procAddr.ip, procAddr.port, true, false));
}
for (auto& procRecord : procArray) {
procRecord->excluded = true;
TraceEvent("RemoveAndKill")
.detail("Step", "ExcludeAddress")
.detail("ProcessAddress", procRecord->address)
.detail("Process", describe(*procRecord))
.detail("Failed", procRecord->failed)
.detail("Rebooting", procRecord->rebooting)
.detail("ClusterAvailable", g_simulator.isAvailable());
}
return procArray;
}
std::vector<ISimulator::ProcessInfo*> includeAddresses(std::set<AddressExclusion> const& procAddrs) {
// Get the updated list of processes which may have changed due to reboots, deletes, etc
std::vector<ISimulator::ProcessInfo*> procArray = getProcesses(procAddrs);
// Include all of the excluded machines because the first command of the next section is includeall
TraceEvent("RemoveAndKill")
.detail("Step", "include addresses")
.detail("AddrTotal", procAddrs.size())
.detail("ProcTotal", procArray.size())
.detail("Addresses", describe(procAddrs))
.detail("ClusterAvailable", g_simulator.isAvailable());
for (auto& procAddr : procAddrs) {
g_simulator.includeAddress(NetworkAddress(procAddr.ip, procAddr.port, true, false));
}
for (auto& procRecord : procArray) {
// Only change the exclusion member, if not failed since it will require a reboot to revive it
if (!procRecord->failed)
procRecord->excluded = false;
TraceEvent("RemoveAndKill")
.detail("Step", "IncludeAddress")
.detail("ProcessAddress", procRecord->address)
.detail("Process", describe(*procRecord))
.detail("Failed", procRecord->failed)
.detail("Rebooting", procRecord->rebooting)
.detail("ClusterAvailable", g_simulator.isAvailable());
}
return procArray;
}
// Return processes that are intersection of killAddrs and allServers and that are safe to kill together;
// killAddrs does not guarantee the addresses are safe to kill simultaneously.
std::vector<ISimulator::ProcessInfo*> protectServers(std::set<AddressExclusion> const& killAddrs) {
std::vector<ISimulator::ProcessInfo*> processes;
std::set<AddressExclusion> processAddrs;
std::vector<AddressExclusion> killableAddrs;
std::vector<ISimulator::ProcessInfo*> killProcArray, killableProcesses, processesLeft, processesDead;
// Get the list of processes matching network address
for (auto processInfo : getServers()) {
auto processNet = AddressExclusion(processInfo->address.ip, processInfo->address.port);
// Mark all of the unavailable as dead
if (!processInfo->isAvailable() || processInfo->isCleared())
processesDead.push_back(processInfo);
// Save all processes not specified within set
else if (killAddrs.find(processNet) == killAddrs.end())
processesLeft.push_back(processInfo);
else
killProcArray.push_back(processInfo);
}
// Identify the largest set of processes which can be killed
int randomIndex;
bool bCanKillProcess;
ISimulator::ProcessInfo* randomProcess;
for (int killsLeft = killProcArray.size(); killsLeft > 0; killsLeft--) {
// Select a random kill process
randomIndex = deterministicRandom()->randomInt(0, killsLeft);
randomProcess = killProcArray[randomIndex];
processesDead.push_back(randomProcess);
killProcArray[randomIndex] = killProcArray.back();
killProcArray.pop_back();
// Add all of the remaining processes the leftover array
processesLeft.insert(processesLeft.end(), killProcArray.begin(), killProcArray.end());
// Check if we can kill the added process
bCanKillProcess =
g_simulator.canKillProcesses(processesLeft, processesDead, ISimulator::KillInstantly, nullptr);
// Remove the added processes
processesLeft.resize(processesLeft.size() - killProcArray.size());
if (bCanKillProcess) {
killableProcesses.push_back(randomProcess);
killableAddrs.push_back(AddressExclusion(randomProcess->address.ip, randomProcess->address.port));
TraceEvent("RemoveAndKill")
.detail("Step", "IdentifyVictim")
.detail("VictimCount", killableAddrs.size())
.detail("Victim", randomProcess->toString())
.detail("Victims", describe(killableAddrs));
}
// Move the process to the keep array
else {
processesLeft.push_back(randomProcess);
processesDead.pop_back();
}
}
return killableProcesses;
}
// toKill1 and toKill2 are two random subsets of all processes. If simply kill all processes in toKill1 or toKill2,
// we may kill too many processes to make the cluster unavailable and stuck.
ACTOR static Future<Void> workloadMain(RemoveServersSafelyWorkload* self,
Database cx,
double waitSeconds,
std::set<AddressExclusion> toKill1,
std::set<AddressExclusion> toKill2) {
wait(updateProcessIds(cx));
wait(delay(waitSeconds));
// Removing the first set of machines might legitimately bring the database down, so a timeout is not an error
state std::vector<NetworkAddress> firstCoordinators;
state std::vector<ISimulator::ProcessInfo*> killProcArray;
state bool bClearedFirst;
TraceEvent("RemoveAndKill")
.detail("Step", "exclude list first")
.detail("ToKill", describe(toKill1))
.detail("KillTotal", toKill1.size())
.detail("ClusterAvailable", g_simulator.isAvailable());
// toKill1 may kill too many servers to make cluster unavailable.
// Get the processes in toKill1 that are safe to kill
killProcArray = self->protectServers(toKill1);
// Update the kill networks to the killable processes
toKill1 = self->getNetworks(killProcArray);
TraceEvent("RemoveAndKill")
.detail("Step", "exclude list first")
.detail("ToKillModified", describe(toKill1))
.detail("KillTotalModified", toKill1.size())
.detail("ClusterAvailable", g_simulator.isAvailable());
self->excludeAddresses(toKill1);
Optional<Void> result = wait(timeout(removeAndKill(self, cx, toKill1, nullptr, false), self->kill1Timeout));
bClearedFirst = result.present();
TraceEvent("RemoveAndKill")
.detail("Step", "excluded list first")
.detail("ExcludeResult", bClearedFirst ? "succeeded" : "failed")
.detail("KillTotal", toKill1.size())
.detail("Processes", killProcArray.size())
.detail("ToKill1", describe(toKill1))
.detail("ClusterAvailable", g_simulator.isAvailable());
// Include the servers, if unable to exclude
// Reinclude when buggify is on to increase the surface area of the next set of excludes
state bool failed = true;
if (!bClearedFirst || BUGGIFY) {
// Get the updated list of processes which may have changed due to reboots, deletes, etc
TraceEvent("RemoveAndKill")
.detail("Step", "include all first")
.detail("KillTotal", toKill1.size())
.detail("ToKill", describe(toKill1))
.detail("ClusterAvailable", g_simulator.isAvailable());
wait(includeServers(cx, std::vector<AddressExclusion>(1)));
wait(includeLocalities(cx, std::vector<std::string>(), failed, true));
wait(includeLocalities(cx, std::vector<std::string>(), !failed, true));
self->includeAddresses(toKill1);
}
// toKill2 may kill too many servers to make cluster unavailable.
// Get the processes in toKill2 that are safe to kill
killProcArray = self->protectServers(toKill2);
// Update the kill networks to the killable processes
toKill2 = self->getNetworks(killProcArray);
TraceEvent("RemoveAndKill")
.detail("Step", "exclude list second")
.detail("KillTotal", toKill2.size())
.detail("ToKill", describe(toKill2))
.detail("ClusterAvailable", g_simulator.isAvailable());
self->excludeAddresses(toKill2);
// The second set of machines is selected so that we can always make progress without it, even after the
// permitted number of other permanent failures so we expect to succeed after a finite amount of time
TraceEvent("RemoveAndKill")
.detail("Step", "exclude second list")
.detail("ToKill2", describe(toKill2))
.detail("KillTotal", toKill2.size())
.detail("Processes", killProcArray.size())
.detail("ClusterAvailable", g_simulator.isAvailable());
wait(reportErrors(timeoutError(removeAndKill(self, cx, toKill2, bClearedFirst ? &toKill1 : nullptr, true),
self->kill2Timeout),
"RemoveServersSafelyError",
UID()));
TraceEvent("RemoveAndKill")
.detail("Step", "excluded second list")
.detail("KillTotal", toKill2.size())
.detail("ToKill", describe(toKill2))
.detail("ClusterAvailable", g_simulator.isAvailable());
// Get the updated list of processes which may have changed due to reboots, deletes, etc
TraceEvent("RemoveAndKill")
.detail("Step", "include all second")
.detail("KillTotal", toKill2.size())
.detail("ToKill", describe(toKill2))
.detail("ClusterAvailable", g_simulator.isAvailable());
wait(includeServers(cx, std::vector<AddressExclusion>(1)));
wait(includeLocalities(cx, std::vector<std::string>(), failed, true));
wait(includeLocalities(cx, std::vector<std::string>(), !failed, true));
self->includeAddresses(toKill2);
return Void();
}
std::vector<ISimulator::ProcessInfo*> killAddresses(std::set<AddressExclusion> const& killAddrs) {
UID functionId = nondeterministicRandom()->randomUniqueID();
bool removeViaClear = !BUGGIFY;
std::vector<ISimulator::ProcessInfo*> killProcArray;
std::vector<AddressExclusion> toKillArray;
std::copy(killAddrs.begin(), killAddrs.end(), std::back_inserter(toKillArray));
killProcArray = getProcesses(killAddrs);
// Reboot and delete or kill the servers
if (killProcesses) {
TraceEvent("RemoveAndKill", functionId)
.detail("Step", removeViaClear ? "ClearProcesses" : "IgnoreProcesses")
.detail("Addresses", describe(killAddrs))
.detail("Processes", killProcArray.size())
.detail("ClusterAvailable", g_simulator.isAvailable())
.detail("RemoveViaClear", removeViaClear);
for (auto& killProcess : killProcArray) {
if (g_simulator.protectedAddresses.count(killProcess->address))
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "NoKill Process")
.detail("Process", describe(*killProcess))
.detail("Failed", killProcess->failed)
.detail("Rebooting", killProcess->rebooting)
.detail("ClusterAvailable", g_simulator.isAvailable())
.detail("Protected", g_simulator.protectedAddresses.count(killProcess->address));
else if (removeViaClear) {
g_simulator.rebootProcess(killProcess, ISimulator::RebootProcessAndDelete);
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Clear Process")
.detail("Process", describe(*killProcess))
.detail("Failed", killProcess->failed)
.detail("Rebooting", killProcess->rebooting)
.detail("ClusterAvailable", g_simulator.isAvailable())
.detail("Protected", g_simulator.protectedAddresses.count(killProcess->address));
}
/*
else {
g_simulator.killProcess( killProcess, ISimulator::KillInstantly );
TraceEvent("RemoveAndKill", functionId).detail("Step", "Kill Process").detail("Process", describe(*killProcess)).detail("Failed", killProcess->failed).detail("Rebooting", killProcess->rebooting).detail("ClusterAvailable", g_simulator.isAvailable()).detail("Protected", g_simulator.protectedAddresses.count(killProcess->address));
}
*/
}
} else {
std::set<Optional<Standalone<StringRef>>> zoneIds;
bool killedMachine;
for (auto& killProcess : killProcArray) {
zoneIds.insert(killProcess->locality.zoneId());
}
TraceEvent("RemoveAndKill", functionId)
.detail("Step", removeViaClear ? "ClearMachines" : "KillMachines")
.detail("Addresses", describe(killAddrs))
.detail("Processes", killProcArray.size())
.detail("Zones", zoneIds.size())
.detail("ClusterAvailable", g_simulator.isAvailable());
for (auto& zoneId : zoneIds) {
killedMachine = g_simulator.killZone(
zoneId, removeViaClear ? ISimulator::RebootAndDelete : ISimulator::KillInstantly);
TraceEvent(killedMachine ? SevInfo : SevWarn, "RemoveAndKill")
.detail("Step", removeViaClear ? "Clear Machine" : "Kill Machine")
.detail("ZoneId", zoneId)
.detail(removeViaClear ? "Cleared" : "Killed", killedMachine)
.detail("ClusterAvailable", g_simulator.isAvailable());
}
}
return killProcArray;
}
// Attempts to exclude a set of processes, and once the exclusion is successful it kills them.
// If markExcludeAsFailed is true, then it is an error if we cannot complete the exclusion.
ACTOR static Future<Void> removeAndKill(RemoveServersSafelyWorkload* self,
Database cx,
std::set<AddressExclusion> toKill,
std::set<AddressExclusion>* pIncAddrs,
bool markExcludeAsFailed) {
state UID functionId = nondeterministicRandom()->randomUniqueID();
// First clear the exclusion list and exclude the given list
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Including all")
.detail("ClusterAvailable", g_simulator.isAvailable())
.detail("MarkExcludeAsFailed", markExcludeAsFailed);
state bool failed = true;
wait(includeServers(cx, std::vector<AddressExclusion>(1)));
wait(includeLocalities(cx, std::vector<std::string>(), failed, true));
wait(includeLocalities(cx, std::vector<std::string>(), !failed, true));
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Included all")
.detail("ClusterAvailable", g_simulator.isAvailable())
.detail("MarkExcludeAsFailed", markExcludeAsFailed);
// Reinclude the addresses that were excluded, if present
if (pIncAddrs) {
self->includeAddresses(*pIncAddrs);
}
state std::vector<ISimulator::ProcessInfo*> killProcArray;
state std::vector<AddressExclusion> toKillArray;
state std::vector<AddressExclusion> toKillMarkFailedArray;
state AddressExclusion coordExcl;
// Exclude a coordinator under buggify, but only if fault tolerance is > 0 and kill set is non-empty already
if (BUGGIFY && toKill.size()) {
std::vector<NetworkAddress> coordinators = wait(getCoordinators(cx));
if (coordinators.size() > 2) {
auto randomCoordinator = deterministicRandom()->randomChoice(coordinators);
coordExcl = AddressExclusion(randomCoordinator.ip, randomCoordinator.port);
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "ChooseCoordinator")
.detail("Coordinator", describe(coordExcl));
}
}
std::copy(toKill.begin(), toKill.end(), std::back_inserter(toKillArray));
if (markExcludeAsFailed) {
state int retries = 0;
loop {
state bool safe = false;
state std::set<AddressExclusion> failSet =
random_subset(toKillArray, deterministicRandom()->randomInt(0, toKillArray.size() + 1));
toKillMarkFailedArray.resize(failSet.size());
std::copy(failSet.begin(), failSet.end(), toKillMarkFailedArray.begin());
std::sort(toKillMarkFailedArray.begin(), toKillMarkFailedArray.end());
if (coordExcl.isValid()) {
toKillMarkFailedArray.push_back(coordExcl);
}
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "SafetyCheck")
.detail("Exclusions", describe(toKillMarkFailedArray));
choose {
when(bool _safe = wait(checkSafeExclusions(cx, toKillMarkFailedArray))) {
safe = _safe && self->protectServers(std::set<AddressExclusion>(toKillMarkFailedArray.begin(),
toKillMarkFailedArray.end()))
.size() == toKillMarkFailedArray.size();
}
when(wait(delay(5.0))) {
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "SafetyCheckTimedOut")
.detail("Exclusions", describe(toKillMarkFailedArray));
}
}
if (retries == self->maxSafetyCheckRetries) {
// Do not mark as failed if limit is reached
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "SafetyCheckLimitReached")
.detail("Retries", retries);
markExcludeAsFailed = false;
safe = true;
}
if (safe)
break;
retries++;
}
}
// Swap coordinator with one server in the kill set to ensure the number of processes to kill does not increase.
// This is needed only if a new coordinator is added to the toKill set in this function and safety check passes
if (markExcludeAsFailed && coordExcl.isValid()) {
// Situation where the entirety of original kill set is selected and extra coordinator is added
// Shrink down failed vector to maintain size guarantees
if (toKillMarkFailedArray.size() > toKillArray.size()) {
auto removeServer = toKillMarkFailedArray.begin();
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "ShrinkFailedKillSet")
.detail("Removing", removeServer->toString());
toKillMarkFailedArray.erase(removeServer);
}
ASSERT(toKillMarkFailedArray.size() <= toKillArray.size());
std::sort(toKillArray.begin(), toKillArray.end());
auto removeServer = toKill.begin();
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "ReplaceNonFailedKillSet")
.detail("Removing", removeServer->toString())
.detail("Adding", coordExcl.toString());
toKillArray.erase(std::remove(toKillArray.begin(), toKillArray.end(), *removeServer), toKillArray.end());
toKillArray.push_back(coordExcl);
toKill.erase(removeServer);
toKill.insert(coordExcl);
}
killProcArray = self->getProcesses(toKill);
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Activate Server Exclusion")
.detail("KillAddrs", toKill.size())
.detail("KillProcs", killProcArray.size())
.detail("MissingProcs", toKill.size() != killProcArray.size())
.detail("ToKill", describe(toKill))
.detail("Addresses", describe(toKillArray))
.detail("FailedAddresses", describe(toKillMarkFailedArray))
.detail("ClusterAvailable", g_simulator.isAvailable())
.detail("MarkExcludeAsFailed", markExcludeAsFailed);
state bool excludeLocalitiesInsteadOfServers = deterministicRandom()->coinflip();
if (markExcludeAsFailed) {
if (excludeLocalitiesInsteadOfServers) {
state std::unordered_set<std::string> toKillLocalitiesFailed =
self->getLocalitiesFromAddresses(toKillMarkFailedArray);
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Excluding localities with failed option")
.detail("FailedAddressesSize", toKillMarkFailedArray.size())
.detail("FailedAddresses", describe(toKillMarkFailedArray))
.detail("FailedLocaitiesSize", toKillLocalitiesFailed.size())
.detail("FailedLocaities", describe(toKillLocalitiesFailed));
wait(excludeLocalities(cx, toKillLocalitiesFailed, true));
} else {
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Excluding servers with failed option")
.detail("FailedAddressesSize", toKillMarkFailedArray.size())
.detail("FailedAddresses", describe(toKillMarkFailedArray));
wait(excludeServers(cx, toKillMarkFailedArray, true));
}
}
if (excludeLocalitiesInsteadOfServers) {
state std::unordered_set<std::string> toKillLocalities = self->getLocalitiesFromAddresses(toKillArray);
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Excluding localities without failed option")
.detail("AddressesSize", toKillArray.size())
.detail("Addresses", describe(toKillArray))
.detail("LocaitiesSize", toKillLocalities.size())
.detail("Locaities", describe(toKillLocalities));
wait(excludeLocalities(cx, toKillLocalities, false));
} else {
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Excluding servers without failed option")
.detail("AddressesSize", toKillArray.size())
.detail("Addresses", describe(toKillArray));
wait(excludeServers(cx, toKillArray));
}
// We need to skip at least the quorum change if there's nothing to kill, because there might not be enough
// servers left alive to do a coordinators auto (?)
if (toKill.size()) {
if (!excludeLocalitiesInsteadOfServers) {
// Wait for removal to be safe
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "Wait For Server Exclusion")
.detail("Addresses", describe(toKill))
.detail("ClusterAvailable", g_simulator.isAvailable());
wait(success(checkForExcludingServers(cx, toKillArray, true /* wait for exclusion */)));
}
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "coordinators auto")
.detail("DesiredCoordinators", g_simulator.desiredCoordinators)
.detail("ClusterAvailable", g_simulator.isAvailable());
// Setup the coordinators BEFORE the exclusion
// Otherwise, we may end up with NotEnoughMachinesForCoordinators
state int cycle = 0;
state int nQuorum;
while (true) {
cycle++;
nQuorum = ((g_simulator.desiredCoordinators + 1) / 2) * 2 - 1;
CoordinatorsResult result = wait(changeQuorum(cx, autoQuorumChange(nQuorum)));
TraceEvent(result == CoordinatorsResult::SUCCESS || result == CoordinatorsResult::SAME_NETWORK_ADDRESSES
? SevInfo
: SevWarn,
"RemoveAndKillQuorumChangeResult")
.detail("Step", "coordinators auto")
.detail("Result", (int)result)
.detail("Attempt", cycle)
.detail("Quorum", nQuorum)
.detail("DesiredCoordinators", g_simulator.desiredCoordinators);
if (result == CoordinatorsResult::SUCCESS || result == CoordinatorsResult::SAME_NETWORK_ADDRESSES)
break;
}
self->killAddresses(toKill);
} else {
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "nothing to clear")
.detail("ClusterAvailable", g_simulator.isAvailable());
}
TraceEvent("RemoveAndKill", functionId)
.detail("Step", "done")
.detail("ClusterAvailable", g_simulator.isAvailable());
return Void();
}
static std::vector<ISimulator::ProcessInfo*> getServers() {
std::vector<ISimulator::ProcessInfo*> machines;
std::vector<ISimulator::ProcessInfo*> all = g_simulator.getAllProcesses();
for (int i = 0; i < all.size(); i++) {
if (all[i]->name == std::string("Server") && all[i]->isAvailableClass()) {
machines.push_back(all[i]);
}
}
return machines;
}
template <class T>
static std::set<T> random_subset(std::vector<T> v, int n) {
std::set<T> subset;
// No, this isn't efficient!
deterministicRandom()->randomShuffle(v);
v.resize(n);
std::copy(v.begin(), v.end(), std::inserter(subset, subset.end()));
return subset;
}
bool killContainsProcess(AddressExclusion kill, NetworkAddress process) {
return kill.excludes(process) || (machineProcesses.find(kill) != machineProcesses.end() &&
machineProcesses[kill].count(AddressExclusion(process.ip, process.port)) > 0);
}
// Finds the localities list that can be excluded from the safe killable addresses list.
// If excluding based on a particular locality of the safe process, kills any other process, that
// particular locality is not included in the killable localities list.
std::unordered_set<std::string> getLocalitiesFromAddresses(const std::vector<AddressExclusion>& addresses) {
std::unordered_map<std::string, int> allLocalitiesCount;
std::unordered_map<std::string, int> killableLocalitiesCount;
auto processes = getServers();
for (const auto& processInfo : processes) {
std::map<std::string, std::string> localityData = processInfo->locality.getAllData();
for (const auto& l : localityData) {
allLocalitiesCount[LocalityData::ExcludeLocalityPrefix.toString() + l.first + ":" + l.second]++;
}
AddressExclusion pAddr(processInfo->address.ip, processInfo->address.port);
if (std::find(addresses.begin(), addresses.end(), pAddr) != addresses.end()) {
for (const auto& l : localityData) {
killableLocalitiesCount[LocalityData::ExcludeLocalityPrefix.toString() + l.first + ":" +
l.second]++;
}
}
}
std::unordered_set<std::string> toKillLocalities;
for (const auto& l : killableLocalitiesCount) {
if (l.second == allLocalitiesCount[l.first]) {
toKillLocalities.insert(l.first);
}
}
return toKillLocalities;
}
// Update the g_simulator processes list with the process ids
// of the workers, that are generated as part of worker creation.
ACTOR static Future<Void> updateProcessIds(Database cx) {
std::vector<ProcessData> workers = wait(getWorkers(cx));
std::unordered_map<NetworkAddress, int> addressToIndexMap;
for (int i = 0; i < workers.size(); i++) {
addressToIndexMap[workers[i].address] = i;
}
std::vector<ISimulator::ProcessInfo*> processes = g_simulator.getAllProcesses();
for (auto process : processes) {
if (addressToIndexMap.find(process->address) != addressToIndexMap.end()) {
if (workers[addressToIndexMap[process->address]].locality.processId().present()) {
process->locality.set(LocalityData::keyProcessId,
workers[addressToIndexMap[process->address]].locality.processId());
}
}
}
return Void();
}
};
WorkloadFactory<RemoveServersSafelyWorkload> RemoveServersSafelyWorkloadFactory("RemoveServersSafely");
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