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XrdRequestManager.cc
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XrdRequestManager.cc
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#include <algorithm>
#include <cassert>
#include <iostream>
#include <memory>
#include <netdb.h>
#include "XrdCl/XrdClPostMasterInterfaces.hh"
#include "XrdCl/XrdClPostMaster.hh"
#include "XrdCl/XrdClFile.hh"
#include "XrdCl/XrdClDefaultEnv.hh"
#include "XrdCl/XrdClFileSystem.hh"
#include "FWCore/Utilities/interface/CPUTimer.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include "FWCore/Utilities/interface/Likely.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/thread_safety_macros.h"
#include "Utilities/StorageFactory/interface/StatisticsSenderService.h"
#include "XrdStatistics.h"
#include "Utilities/XrdAdaptor/src/XrdRequestManager.h"
#include "Utilities/XrdAdaptor/src/XrdHostHandler.hh"
static constexpr int XRD_CL_MAX_CHUNK = 512 * 1024;
static constexpr int XRD_ADAPTOR_SHORT_OPEN_DELAY = 5;
#ifdef XRD_FAKE_OPEN_PROBE
static constexpr int XRD_ADAPTOR_OPEN_PROBE_PERCENT = 100;
static constexpr int XRD_ADAPTOR_LONG_OPEN_DELAY = 20;
// This is the minimal difference in quality required to swap an active and inactive source
static constexpr int XRD_ADAPTOR_SOURCE_QUALITY_FUDGE = 0;
#else
static constexpr int XRD_ADAPTOR_OPEN_PROBE_PERCENT = 10;
static constexpr int XRD_ADAPTOR_LONG_OPEN_DELAY = 2 * 60;
static constexpr int XRD_ADAPTOR_SOURCE_QUALITY_FUDGE = 100;
#endif
static constexpr int XRD_ADAPTOR_CHUNK_THRESHOLD = 1000;
#ifdef __MACH__
#include <mach/clock.h>
#include <mach/mach.h>
#define GET_CLOCK_MONOTONIC(ts) \
{ \
clock_serv_t cclock; \
mach_timespec_t mts; \
host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock); \
clock_get_time(cclock, &mts); \
mach_port_deallocate(mach_task_self(), cclock); \
ts.tv_sec = mts.tv_sec; \
ts.tv_nsec = mts.tv_nsec; \
}
#else
#define GET_CLOCK_MONOTONIC(ts) clock_gettime(CLOCK_MONOTONIC, &ts);
#endif
using namespace XrdAdaptor;
using namespace edm::storage;
long long timeDiffMS(const timespec &a, const timespec &b) {
long long diff = (a.tv_sec - b.tv_sec) * 1000;
diff += (a.tv_nsec - b.tv_nsec) / 1e6;
return diff;
}
/*
* We do not care about the response of sending the monitoring information;
* this handler class simply frees any returned buffer to prevent memory leaks.
*/
class SendMonitoringInfoHandler : public XrdCl::ResponseHandler {
void HandleResponse(XrdCl::XRootDStatus *status, XrdCl::AnyObject *response) override {
if (response) {
XrdCl::Buffer *buffer = nullptr;
response->Get(buffer);
response->Set(static_cast<int *>(nullptr));
delete buffer;
}
// Send Info has a response object; we must delete it.
delete response;
delete status;
delete this;
}
XrdCl::FileSystem m_fs;
public:
SendMonitoringInfoHandler(const SendMonitoringInfoHandler &) = delete;
SendMonitoringInfoHandler &operator=(const SendMonitoringInfoHandler &) = delete;
SendMonitoringInfoHandler() = delete;
SendMonitoringInfoHandler(const std::string &url) : m_fs(url) {}
XrdCl::FileSystem &fs() { return m_fs; }
};
static void SendMonitoringInfo(XrdCl::File &file) {
// Do not send this to a dCache data server as they return an error.
// In some versions of dCache, sending the monitoring information causes
// the server to close the connection - resulting in failures.
if (Source::isDCachePool(file)) {
return;
}
// Send the monitoring info, if available.
const char *jobId = edm::storage::StatisticsSenderService::getJobID();
std::string lastUrl;
file.GetProperty("LastURL", lastUrl);
if (jobId && !lastUrl.empty()) {
auto sm_handler = new SendMonitoringInfoHandler(lastUrl);
if (!(sm_handler->fs().SendInfo(jobId, sm_handler, 30).IsOK())) {
edm::LogWarning("XrdAdaptorInternal")
<< "Failed to send the monitoring information, monitoring ID is " << jobId << ".";
delete sm_handler;
}
edm::LogInfo("XrdAdaptorInternal") << "Set monitoring ID to " << jobId << ".";
}
}
namespace {
std::unique_ptr<std::string> getQueryTransport(const XrdCl::URL &url, uint16_t query) {
XrdCl::AnyObject result;
XrdCl::DefaultEnv::GetPostMaster()->QueryTransport(url, query, result);
std::string *tmp;
result.Get(tmp);
return std::unique_ptr<std::string>(tmp);
}
void tracerouteRedirections(const XrdCl::HostList *hostList) {
edm::LogInfo("XrdAdaptorLvl2").log([hostList](auto &li) {
int idx_redirection = 1;
li << "-------------------------------\nTraceroute:\n";
for (auto const &host : *hostList) {
// Query info
std::unique_ptr<std::string> stack_ip_method = getQueryTransport(host.url, XrdCl::StreamQuery::IpStack);
std::unique_ptr<std::string> ip_method = getQueryTransport(host.url, XrdCl::StreamQuery::IpAddr);
std::unique_ptr<std::string> auth_method = getQueryTransport(host.url, XrdCl::TransportQuery::Auth);
std::unique_ptr<std::string> hostname_method = getQueryTransport(host.url, XrdCl::StreamQuery::HostName);
std::string type_resource = "endpoint";
std::string authentication;
// Organize redirection info
if (!auth_method->empty()) {
authentication = *auth_method;
} else {
authentication = "no auth";
};
if (host.loadBalancer == 1) {
type_resource = "load balancer";
};
li.format("{}. || {} / {} / {} / {} / {} / {} ||\n",
idx_redirection,
*hostname_method,
*stack_ip_method,
*ip_method,
host.url.GetPort(),
authentication,
type_resource);
++idx_redirection;
}
li.format("-------------------------------");
});
}
} // namespace
RequestManager::RequestManager(const std::string &filename, XrdCl::OpenFlags::Flags flags, XrdCl::Access::Mode perms)
: m_serverToAdvertise(nullptr),
m_timeout(XRD_DEFAULT_TIMEOUT),
m_nextInitialSourceToggle(false),
m_redirectLimitDelayScale(1),
m_name(filename),
m_flags(flags),
m_perms(perms),
m_distribution(0, 100),
m_excluded_active_count(0) {}
void RequestManager::initialize(std::weak_ptr<RequestManager> self) {
m_open_handler = OpenHandler::getInstance(self);
XrdCl::Env *env = XrdCl::DefaultEnv::GetEnv();
if (env) {
env->GetInt("StreamErrorWindow", m_timeout);
}
std::string orig_site;
if (!Source::getXrootdSiteFromURL(m_name, orig_site) && (orig_site.find('.') == std::string::npos)) {
std::string hostname;
if (Source::getHostname(orig_site, hostname)) {
Source::getDomain(hostname, orig_site);
}
}
std::unique_ptr<XrdCl::File> file;
edm::Exception ex(edm::errors::FileOpenError);
bool validFile = false;
const int retries = 5;
std::string excludeString;
for (int idx = 0; idx < retries; idx++) {
file = std::make_unique<XrdCl::File>();
auto opaque = prepareOpaqueString();
std::string new_filename =
m_name + (!opaque.empty() ? ((m_name.find('?') == m_name.npos) ? "?" : "&") + opaque : "");
SyncHostResponseHandler handler;
XrdCl::XRootDStatus openStatus = file->Open(new_filename, m_flags, m_perms, &handler);
if (!openStatus
.IsOK()) { // In this case, we failed immediately - this indicates we have previously tried to talk to this
// server and it was marked bad - xrootd couldn't even queue up the request internally!
// In practice, we obsere this happening when the call to getXrootdSiteFromURL fails due to the
// redirector being down or authentication failures.
ex.clearMessage();
ex.clearContext();
ex.clearAdditionalInfo();
ex << "XrdCl::File::Open(name='" << m_name << "', flags=0x" << std::hex << m_flags << ", permissions=0"
<< std::oct << m_perms << std::dec << ") => error '" << openStatus.ToStr() << "' (errno=" << openStatus.errNo
<< ", code=" << openStatus.code << ")";
ex.addContext("Calling XrdFile::open()");
ex.addAdditionalInfo("Remote server already encountered a fatal error; no redirections were performed.");
throw ex;
}
handler.WaitForResponse();
std::unique_ptr<XrdCl::XRootDStatus> status = handler.GetStatus();
std::unique_ptr<XrdCl::HostList> hostList = handler.GetHosts();
tracerouteRedirections(hostList.get());
Source::determineHostExcludeString(*file, hostList.get(), excludeString);
assert(status);
if (status->IsOK()) {
validFile = true;
break;
} else {
ex.clearMessage();
ex.clearContext();
ex.clearAdditionalInfo();
ex << "XrdCl::File::Open(name='" << m_name << "', flags=0x" << std::hex << m_flags << ", permissions=0"
<< std::oct << m_perms << std::dec << ") => error '" << status->ToStr() << "' (errno=" << status->errNo
<< ", code=" << status->code << ")";
ex.addContext("Calling XrdFile::open()");
addConnections(ex);
std::string dataServer, lastUrl;
file->GetProperty("DataServer", dataServer);
file->GetProperty("LastURL", lastUrl);
if (!dataServer.empty()) {
ex.addAdditionalInfo("Problematic data server: " + dataServer);
}
if (!lastUrl.empty()) {
ex.addAdditionalInfo("Last URL tried: " + lastUrl);
edm::LogWarning("XrdAdaptorInternal") << "Failed to open file at URL " << lastUrl << ".";
}
if (std::find(m_disabledSourceStrings.begin(), m_disabledSourceStrings.end(), dataServer) !=
m_disabledSourceStrings.end()) {
ex << ". No additional data servers were found.";
throw ex;
}
if (!dataServer.empty()) {
m_disabledSourceStrings.insert(dataServer);
m_disabledExcludeStrings.insert(excludeString);
}
// In this case, we didn't go anywhere - we stayed at the redirector and it gave us a file-not-found.
if (lastUrl == new_filename) {
edm::LogWarning("XrdAdaptorInternal") << lastUrl << ", " << new_filename;
throw ex;
}
}
}
if (!validFile) {
throw ex;
}
SendMonitoringInfo(*file);
timespec ts;
GET_CLOCK_MONOTONIC(ts);
auto source = std::make_shared<Source>(ts, std::move(file), excludeString);
{
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
auto oldList = m_activeSources;
m_activeSources.push_back(source);
reportSiteChange(oldList, m_activeSources, orig_site);
}
queueUpdateCurrentServer(source->ID());
updateCurrentServer();
m_lastSourceCheck = ts;
ts.tv_sec += XRD_ADAPTOR_SHORT_OPEN_DELAY;
m_nextActiveSourceCheck = ts;
}
/**
* Update the StatisticsSenderService with the current server info.
*
* As this accesses the edm::Service infrastructure, this MUST be called
* from an edm-managed thread. It CANNOT be called from an Xrootd-managed
* thread.
*/
void RequestManager::updateCurrentServer() {
// NOTE: we use memory_order_relaxed here, meaning that we may actually miss
// a pending update. *However*, since we call this for every read, we'll get it
// eventually.
if (LIKELY(!m_serverToAdvertise.load(std::memory_order_relaxed))) {
return;
}
std::string *hostname_ptr;
if ((hostname_ptr = m_serverToAdvertise.exchange(nullptr))) {
std::unique_ptr<std::string> hostname(hostname_ptr);
edm::Service<edm::storage::StatisticsSenderService> statsService;
if (statsService.isAvailable()) {
statsService->setCurrentServer(m_name, *hostname_ptr);
}
}
}
void RequestManager::queueUpdateCurrentServer(const std::string &id) {
auto hostname = std::make_unique<std::string>(id);
if (Source::getHostname(id, *hostname)) {
std::string *null_hostname = nullptr;
if (m_serverToAdvertise.compare_exchange_strong(null_hostname, hostname.get())) {
hostname.release();
}
}
}
namespace {
std::string formatSites(std::vector<std::shared_ptr<Source>> const &iSources) {
std::string siteA, siteB;
if (!iSources.empty()) {
siteA = iSources[0]->Site();
}
if (iSources.size() == 2) {
siteB = iSources[1]->Site();
}
std::string siteList = siteA;
if (!siteB.empty() && (siteB != siteA)) {
siteList = siteA + ", " + siteB;
}
return siteList;
}
} // namespace
void RequestManager::reportSiteChange(std::vector<std::shared_ptr<Source>> const &iOld,
std::vector<std::shared_ptr<Source>> const &iNew,
std::string orig_site) const {
auto siteList = formatSites(iNew);
if (orig_site.empty() || (orig_site == siteList)) {
auto oldSites = formatSites(iOld);
}
edm::LogInfo("XrdAdaptorLvl1").log([&](auto &li) {
li << "Serving data from: ";
int size_active_sources = iNew.size();
for (int i = 0; i < size_active_sources; ++i) {
std::string hostname_a;
Source::getHostname(iNew[i]->PrettyID(), hostname_a);
li.format(" [{}] {}", i + 1, hostname_a);
}
});
edm::LogInfo("XrdAdaptorLvl3").log([&](auto &li) {
li << "The quality of the active sources is: ";
int size_active_sources = iNew.size();
for (int i = 0; i < size_active_sources; ++i) {
std::string hostname_a;
Source::getHostname(iNew[i]->PrettyID(), hostname_a);
std::string quality = std::to_string(iNew[i]->getQuality());
li.format(" [{}] {} for {}", i + 1, quality, hostname_a);
}
});
}
void RequestManager::checkSources(timespec &now,
IOSize requestSize,
std::vector<std::shared_ptr<Source>> &activeSources,
std::vector<std::shared_ptr<Source>> &inactiveSources) {
edm::LogVerbatim("XrdAdaptorInternal") << "Time since last check " << timeDiffMS(now, m_lastSourceCheck)
<< "; last check " << m_lastSourceCheck.tv_sec << "; now " << now.tv_sec
<< "; next check " << m_nextActiveSourceCheck.tv_sec << std::endl;
if (timeDiffMS(now, m_lastSourceCheck) > 1000) {
{ // Be more aggressive about getting rid of very bad sources.
compareSources(now, 0, 1, activeSources, inactiveSources);
compareSources(now, 1, 0, activeSources, inactiveSources);
}
if (timeDiffMS(now, m_nextActiveSourceCheck) > 0) {
checkSourcesImpl(now, requestSize, activeSources, inactiveSources);
}
}
}
bool RequestManager::compareSources(const timespec &now,
unsigned a,
unsigned b,
std::vector<std::shared_ptr<Source>> &activeSources,
std::vector<std::shared_ptr<Source>> &inactiveSources) const {
if (activeSources.size() < std::max(a, b) + 1) {
return false;
}
unsigned quality_a = activeSources[a]->getQuality();
unsigned quality_b = activeSources[b]->getQuality();
bool findNewSource = false;
if ((quality_a > 5130) || ((quality_a > 260) && (quality_b * 4 < quality_a))) {
std::string hostname_a;
Source::getHostname(activeSources[a]->ID(), hostname_a);
if (quality_a > 5130) {
edm::LogWarning("XrdAdaptorLvl3") << "Deactivating " << hostname_a << " from active sources because the quality ("
<< quality_a << ") is above 5130 and it is not the only active server";
}
if ((quality_a > 260) && (quality_b * 4 < quality_a)) {
std::string hostname_b;
Source::getHostname(activeSources[b]->ID(), hostname_b);
edm::LogWarning("XrdAdaptorLvl3") << "Deactivating " << hostname_a << " from active sources because its quality ("
<< quality_a
<< ") is higher than 260 and 4 times larger than the other active server "
<< hostname_b << " (" << quality_b << ") ";
}
edm::LogVerbatim("XrdAdaptorInternal") << "Removing " << hostname_a << " from active sources due to poor quality ("
<< quality_a << " vs " << quality_b << ")" << std::endl;
if (activeSources[a]->getLastDowngrade().tv_sec != 0) {
findNewSource = true;
}
activeSources[a]->setLastDowngrade(now);
inactiveSources.emplace_back(activeSources[a]);
auto oldSources = activeSources;
activeSources.erase(activeSources.begin() + a);
reportSiteChange(oldSources, activeSources);
}
return findNewSource;
}
void RequestManager::checkSourcesImpl(timespec &now,
IOSize requestSize,
std::vector<std::shared_ptr<Source>> &activeSources,
std::vector<std::shared_ptr<Source>> &inactiveSources) {
bool findNewSource = false;
if (activeSources.size() <= 1) {
findNewSource = true;
edm::LogInfo("XrdAdaptorLvl3")
<< "Looking for an additional source because the number of active sources is smaller than 2";
} else if (activeSources.size() > 1) {
edm::LogVerbatim("XrdAdaptorInternal") << "Source 0 quality " << activeSources[0]->getQuality()
<< ", source 1 quality " << activeSources[1]->getQuality() << std::endl;
findNewSource |= compareSources(now, 0, 1, activeSources, inactiveSources);
findNewSource |= compareSources(now, 1, 0, activeSources, inactiveSources);
// NOTE: We could probably replace the copy with a better sort function.
// However, there are typically very few sources and the correctness is more obvious right now.
std::vector<std::shared_ptr<Source>> eligibleInactiveSources;
eligibleInactiveSources.reserve(inactiveSources.size());
for (const auto &source : inactiveSources) {
if (timeDiffMS(now, source->getLastDowngrade()) > (XRD_ADAPTOR_SHORT_OPEN_DELAY - 1) * 1000) {
eligibleInactiveSources.push_back(source);
}
}
auto bestInactiveSource =
std::min_element(eligibleInactiveSources.begin(),
eligibleInactiveSources.end(),
[](const std::shared_ptr<Source> &s1, const std::shared_ptr<Source> &s2) {
return s1->getQuality() < s2->getQuality();
});
auto worstActiveSource = std::max_element(activeSources.cbegin(),
activeSources.cend(),
[](const std::shared_ptr<Source> &s1, const std::shared_ptr<Source> &s2) {
return s1->getQuality() < s2->getQuality();
});
if (bestInactiveSource != eligibleInactiveSources.end() && bestInactiveSource->get()) {
edm::LogVerbatim("XrdAdaptorInternal") << "Best inactive source: " << (*bestInactiveSource)->PrettyID()
<< ", quality " << (*bestInactiveSource)->getQuality();
}
edm::LogVerbatim("XrdAdaptorInternal") << "Worst active source: " << (*worstActiveSource)->PrettyID()
<< ", quality " << (*worstActiveSource)->getQuality();
// Only upgrade the source if we only have one source and the best inactive one isn't too horrible.
// Regardless, we will want to re-evaluate the new source quickly (within 5s).
if ((bestInactiveSource != eligibleInactiveSources.end()) && activeSources.size() == 1 &&
((*bestInactiveSource)->getQuality() < 4 * activeSources[0]->getQuality())) {
auto oldSources = activeSources;
activeSources.push_back(*bestInactiveSource);
reportSiteChange(oldSources, activeSources);
for (auto it = inactiveSources.begin(); it != inactiveSources.end(); it++)
if (it->get() == bestInactiveSource->get()) {
inactiveSources.erase(it);
break;
}
} else
while ((bestInactiveSource != eligibleInactiveSources.end()) &&
(*worstActiveSource)->getQuality() >
(*bestInactiveSource)->getQuality() + XRD_ADAPTOR_SOURCE_QUALITY_FUDGE) {
edm::LogVerbatim("XrdAdaptorInternal")
<< "Removing " << (*worstActiveSource)->PrettyID() << " from active sources due to quality ("
<< (*worstActiveSource)->getQuality() << ") and promoting " << (*bestInactiveSource)->PrettyID()
<< " (quality: " << (*bestInactiveSource)->getQuality() << ")" << std::endl;
(*worstActiveSource)->setLastDowngrade(now);
for (auto it = inactiveSources.begin(); it != inactiveSources.end(); it++)
if (it->get() == bestInactiveSource->get()) {
inactiveSources.erase(it);
break;
}
inactiveSources.emplace_back(*worstActiveSource);
auto oldSources = activeSources;
activeSources.erase(worstActiveSource);
activeSources.emplace_back(std::move(*bestInactiveSource));
reportSiteChange(oldSources, activeSources);
eligibleInactiveSources.clear();
for (const auto &source : inactiveSources)
if (timeDiffMS(now, source->getLastDowngrade()) > (XRD_ADAPTOR_LONG_OPEN_DELAY - 1) * 1000)
eligibleInactiveSources.push_back(source);
bestInactiveSource = std::min_element(eligibleInactiveSources.begin(),
eligibleInactiveSources.end(),
[](const std::shared_ptr<Source> &s1, const std::shared_ptr<Source> &s2) {
return s1->getQuality() < s2->getQuality();
});
worstActiveSource = std::max_element(activeSources.begin(),
activeSources.end(),
[](const std::shared_ptr<Source> &s1, const std::shared_ptr<Source> &s2) {
return s1->getQuality() < s2->getQuality();
});
}
if (!findNewSource && (timeDiffMS(now, m_lastSourceCheck) > 1000 * XRD_ADAPTOR_LONG_OPEN_DELAY)) {
float r = m_distribution(m_generator);
if (r < XRD_ADAPTOR_OPEN_PROBE_PERCENT) {
findNewSource = true;
}
}
}
if (findNewSource) {
m_open_handler->open();
m_lastSourceCheck = now;
}
// Only aggressively look for new sources if we don't have two.
if (activeSources.size() == 2) {
now.tv_sec += XRD_ADAPTOR_LONG_OPEN_DELAY - XRD_ADAPTOR_SHORT_OPEN_DELAY;
} else {
now.tv_sec += XRD_ADAPTOR_SHORT_OPEN_DELAY;
}
m_nextActiveSourceCheck = now;
}
std::shared_ptr<XrdCl::File> RequestManager::getActiveFile() const {
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
if (m_activeSources.empty()) {
edm::Exception ex(edm::errors::FileReadError);
ex << "XrdAdaptor::RequestManager::getActiveFile(name='" << m_name << "', flags=0x" << std::hex << m_flags
<< ", permissions=0" << std::oct << m_perms << std::dec << ") => Source used after fatal exception.";
ex.addContext("In XrdAdaptor::RequestManager::handle()");
addConnections(ex);
throw ex;
}
return m_activeSources[0]->getFileHandle();
}
void RequestManager::getActiveSourceNames(std::vector<std::string> &sources) const {
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
sources.reserve(m_activeSources.size());
for (auto const &source : m_activeSources) {
sources.push_back(source->ID());
}
}
void RequestManager::getPrettyActiveSourceNames(std::vector<std::string> &sources) const {
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
sources.reserve(m_activeSources.size());
for (auto const &source : m_activeSources) {
sources.push_back(source->PrettyID());
}
}
void RequestManager::getDisabledSourceNames(std::vector<std::string> &sources) const {
sources.reserve(m_disabledSourceStrings.size());
for (auto const &source : m_disabledSourceStrings) {
sources.push_back(source);
}
}
void RequestManager::addConnections(cms::Exception &ex) const {
std::vector<std::string> sources;
getPrettyActiveSourceNames(sources);
for (auto const &source : sources) {
ex.addAdditionalInfo("Active source: " + source);
}
sources.clear();
getDisabledSourceNames(sources);
for (auto const &source : sources) {
ex.addAdditionalInfo("Disabled source: " + source);
}
}
std::shared_ptr<Source> RequestManager::pickSingleSource() {
std::shared_ptr<Source> source = nullptr;
{
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
if (m_activeSources.size() == 2) {
if (m_nextInitialSourceToggle) {
source = m_activeSources[0];
m_nextInitialSourceToggle = false;
} else {
source = m_activeSources[1];
m_nextInitialSourceToggle = true;
}
} else if (m_activeSources.empty()) {
edm::Exception ex(edm::errors::FileReadError);
ex << "XrdAdaptor::RequestManager::handle read(name='" << m_name << "', flags=0x" << std::hex << m_flags
<< ", permissions=0" << std::oct << m_perms << std::dec << ") => Source used after fatal exception.";
ex.addContext("In XrdAdaptor::RequestManager::handle()");
addConnections(ex);
throw ex;
} else {
source = m_activeSources[0];
}
}
return source;
}
std::future<IOSize> RequestManager::handle(std::shared_ptr<XrdAdaptor::ClientRequest> c_ptr) {
assert(c_ptr.get());
timespec now;
GET_CLOCK_MONOTONIC(now);
//NOTE: can't hold lock while calling checkSources since can lead to lock inversion
std::vector<std::shared_ptr<Source>> activeSources, inactiveSources;
{
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
activeSources = m_activeSources;
inactiveSources = m_inactiveSources;
}
{
//make sure we update values before calling pickSingelSource
std::shared_ptr<void *> guard(nullptr, [this, &activeSources, &inactiveSources](void *) {
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
m_activeSources = std::move(activeSources);
m_inactiveSources = std::move(inactiveSources);
});
checkSources(now, c_ptr->getSize(), activeSources, inactiveSources);
}
std::shared_ptr<Source> source = pickSingleSource();
source->handle(c_ptr);
return c_ptr->get_future();
}
std::string RequestManager::prepareOpaqueString() const {
struct {
std::stringstream ss;
size_t count = 0;
bool has_active = false;
void append_tried(const std::string &id, bool active = false) {
ss << (count ? "," : "tried=") << id;
count++;
if (active) {
has_active = true;
}
}
} state;
{
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
for (const auto &it : m_activeSources) {
state.append_tried(it->ExcludeID().substr(0, it->ExcludeID().find(':')), true);
}
for (const auto &it : m_inactiveSources) {
state.append_tried(it->ExcludeID().substr(0, it->ExcludeID().find(':')));
}
}
for (const auto &it : m_disabledExcludeStrings) {
state.append_tried(it.substr(0, it.find(':')));
}
if (state.has_active) {
state.ss << "&triedrc=resel";
}
return state.ss.str();
}
void XrdAdaptor::RequestManager::handleOpen(XrdCl::XRootDStatus &status, std::shared_ptr<Source> source) {
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
if (status.IsOK()) {
edm::LogVerbatim("XrdAdaptorInternal") << "Successfully opened new source: " << source->PrettyID() << std::endl;
m_redirectLimitDelayScale = 1;
for (const auto &s : m_activeSources) {
if (source->ID() == s->ID()) {
edm::LogVerbatim("XrdAdaptorInternal")
<< "Xrootd server returned excluded source " << source->PrettyID() << "; ignoring" << std::endl;
unsigned returned_count = ++m_excluded_active_count;
m_nextActiveSourceCheck.tv_sec += XRD_ADAPTOR_SHORT_OPEN_DELAY;
if (returned_count >= 3) {
m_nextActiveSourceCheck.tv_sec += XRD_ADAPTOR_LONG_OPEN_DELAY - 2 * XRD_ADAPTOR_SHORT_OPEN_DELAY;
}
return;
}
}
for (const auto &s : m_inactiveSources) {
if (source->ID() == s->ID()) {
edm::LogVerbatim("XrdAdaptorInternal")
<< "Xrootd server returned excluded inactive source " << source->PrettyID() << "; ignoring" << std::endl;
m_nextActiveSourceCheck.tv_sec += XRD_ADAPTOR_LONG_OPEN_DELAY - XRD_ADAPTOR_SHORT_OPEN_DELAY;
return;
}
}
if (m_activeSources.size() < 2) {
auto oldSources = m_activeSources;
m_activeSources.push_back(source);
reportSiteChange(oldSources, m_activeSources);
queueUpdateCurrentServer(source->ID());
} else {
m_inactiveSources.push_back(source);
}
} else { // File-open failure - wait at least 120s before next attempt.
edm::LogVerbatim("XrdAdaptorInternal") << "Got failure when trying to open a new source" << std::endl;
int delayScale = 1;
if (status.status == XrdCl::errRedirectLimit) {
m_redirectLimitDelayScale = std::min(2 * m_redirectLimitDelayScale, 100);
delayScale = m_redirectLimitDelayScale;
}
m_nextActiveSourceCheck.tv_sec += delayScale * XRD_ADAPTOR_LONG_OPEN_DELAY - XRD_ADAPTOR_SHORT_OPEN_DELAY;
}
}
std::future<IOSize> XrdAdaptor::RequestManager::handle(std::shared_ptr<std::vector<IOPosBuffer>> iolist) {
//Use a copy of m_activeSources and m_inactiveSources throughout this function
// in order to avoid holding the lock a long time and causing a deadlock.
// When the function is over we will update the values of the containers
std::vector<std::shared_ptr<Source>> activeSources, inactiveSources;
{
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
activeSources = m_activeSources;
inactiveSources = m_inactiveSources;
}
//Make sure we update changes when we leave the function
std::shared_ptr<void *> guard(nullptr, [this, &activeSources, &inactiveSources](void *) {
std::lock_guard<std::recursive_mutex> sentry(m_source_mutex);
m_activeSources = std::move(activeSources);
m_inactiveSources = std::move(inactiveSources);
});
updateCurrentServer();
timespec now;
GET_CLOCK_MONOTONIC(now);
edm::CPUTimer timer;
timer.start();
if (activeSources.size() == 1) {
auto c_ptr = std::make_shared<XrdAdaptor::ClientRequest>(*this, iolist);
checkSources(now, c_ptr->getSize(), activeSources, inactiveSources);
activeSources[0]->handle(c_ptr);
return c_ptr->get_future();
}
// Make sure active
else if (activeSources.empty()) {
edm::Exception ex(edm::errors::FileReadError);
ex << "XrdAdaptor::RequestManager::handle readv(name='" << m_name << "', flags=0x" << std::hex << m_flags
<< ", permissions=0" << std::oct << m_perms << std::dec << ") => Source used after fatal exception.";
ex.addContext("In XrdAdaptor::RequestManager::handle()");
addConnections(ex);
throw ex;
}
assert(iolist.get());
auto req1 = std::make_shared<std::vector<IOPosBuffer>>();
auto req2 = std::make_shared<std::vector<IOPosBuffer>>();
splitClientRequest(*iolist, *req1, *req2, activeSources);
checkSources(now, req1->size() + req2->size(), activeSources, inactiveSources);
// CheckSources may have removed a source
if (activeSources.size() == 1) {
auto c_ptr = std::make_shared<XrdAdaptor::ClientRequest>(*this, iolist);
activeSources[0]->handle(c_ptr);
return c_ptr->get_future();
}
std::shared_ptr<XrdAdaptor::ClientRequest> c_ptr1, c_ptr2;
std::future<IOSize> future1, future2;
if (!req1->empty()) {
c_ptr1.reset(new XrdAdaptor::ClientRequest(*this, req1));
activeSources[0]->handle(c_ptr1);
future1 = c_ptr1->get_future();
}
if (!req2->empty()) {
c_ptr2.reset(new XrdAdaptor::ClientRequest(*this, req2));
activeSources[1]->handle(c_ptr2);
future2 = c_ptr2->get_future();
}
if (!req1->empty() && !req2->empty()) {
std::future<IOSize> task = std::async(
std::launch::deferred,
[](std::future<IOSize> a, std::future<IOSize> b) {
// Wait until *both* results are available. This is essential
// as the callback may try referencing the RequestManager. If one
// throws an exception (causing the RequestManager to be destroyed by
// XrdFile) and the other has a failure, then the recovery code will
// reference the destroyed RequestManager.
//
// Unlike other places where we use shared/weak ptrs to maintain object
// lifetime and destruction asynchronously, we *cannot* destroy the request
// asynchronously as it is associated with a ROOT buffer. We must wait until we
// are guaranteed that XrdCl will not write into the ROOT buffer before we
// can return.
b.wait();
a.wait();
return b.get() + a.get();
},
std::move(future1),
std::move(future2));
timer.stop();
//edm::LogVerbatim("XrdAdaptorInternal") << "Total time to create requests " << static_cast<int>(1000*timer.realTime()) << std::endl;
return task;
} else if (!req1->empty()) {
return future1;
} else if (!req2->empty()) {
return future2;
} else { // Degenerate case - no bytes to read.
std::promise<IOSize> p;
p.set_value(0);
return p.get_future();
}
}
void RequestManager::requestFailure(std::shared_ptr<XrdAdaptor::ClientRequest> c_ptr, XrdCl::Status &c_status) {
std::shared_ptr<Source> source_ptr = c_ptr->getCurrentSource();
// Fail early for invalid responses - XrdFile has a separate path for handling this.
if (c_status.code == XrdCl::errInvalidResponse) {
edm::LogWarning("XrdAdaptorInternal") << "Invalid response when reading from " << source_ptr->PrettyID();
XrootdException ex(c_status, edm::errors::FileReadError);
ex << "XrdAdaptor::RequestManager::requestFailure readv(name='" << m_name << "', flags=0x" << std::hex << m_flags
<< ", permissions=0" << std::oct << m_perms << std::dec << ", old source=" << source_ptr->PrettyID()
<< ") => Invalid ReadV response from server";
ex.addContext("In XrdAdaptor::RequestManager::requestFailure()");
addConnections(ex);
throw ex;
}
edm::LogWarning("XrdAdaptorInternal") << "Request failure when reading from " << source_ptr->PrettyID();
// Note that we do not delete the Source itself. That is because this
// function may be called from within XrdCl::ResponseHandler::HandleResponseWithHosts
// In such a case, if you close a file in the handler, it will deadlock
m_disabledSourceStrings.insert(source_ptr->ID());
m_disabledExcludeStrings.insert(source_ptr->ExcludeID());
m_disabledSources.insert(source_ptr);
std::unique_lock<std::recursive_mutex> sentry(m_source_mutex);
if ((!m_activeSources.empty()) && (m_activeSources[0].get() == source_ptr.get())) {
auto oldSources = m_activeSources;
m_activeSources.erase(m_activeSources.begin());
reportSiteChange(oldSources, m_activeSources);
} else if ((m_activeSources.size() > 1) && (m_activeSources[1].get() == source_ptr.get())) {
auto oldSources = m_activeSources;
m_activeSources.erase(m_activeSources.begin() + 1);
reportSiteChange(oldSources, m_activeSources);
}
std::shared_ptr<Source> new_source;
if (m_activeSources.empty()) {
std::shared_future<std::shared_ptr<Source>> future = m_open_handler->open();
timespec now;
GET_CLOCK_MONOTONIC(now);
m_lastSourceCheck = now;
// Note we only wait for 180 seconds here. This is because we've already failed
// once and the likelihood the program has some inconsistent state is decent.
// We'd much rather fail hard than deadlock!
sentry.unlock();
std::future_status status = future.wait_for(std::chrono::seconds(m_timeout + 10));
if (status == std::future_status::timeout) {
XrootdException ex(c_status, edm::errors::FileOpenError);
ex << "XrdAdaptor::RequestManager::requestFailure Open(name='" << m_name << "', flags=0x" << std::hex << m_flags
<< ", permissions=0" << std::oct << m_perms << std::dec << ", old source=" << source_ptr->PrettyID()
<< ") => timeout when waiting for file open";
ex.addContext("In XrdAdaptor::RequestManager::requestFailure()");
addConnections(ex);
throw ex;
} else {
try {
new_source = future.get();
} catch (edm::Exception &ex) {
ex.addContext("Handling XrdAdaptor::RequestManager::requestFailure()");
ex.addAdditionalInfo("Original failed source is " + source_ptr->PrettyID());
throw;
}
}
if (std::find(m_disabledSourceStrings.begin(), m_disabledSourceStrings.end(), new_source->ID()) !=
m_disabledSourceStrings.end()) {
// The server gave us back a data node we requested excluded. Fatal!
XrootdException ex(c_status, edm::errors::FileOpenError);
ex << "XrdAdaptor::RequestManager::requestFailure Open(name='" << m_name << "', flags=0x" << std::hex << m_flags
<< ", permissions=0" << std::oct << m_perms << std::dec << ", old source=" << source_ptr->PrettyID()
<< ", new source=" << new_source->PrettyID() << ") => Xrootd server returned an excluded source";
ex.addContext("In XrdAdaptor::RequestManager::requestFailure()");
addConnections(ex);
throw ex;
}
sentry.lock();
auto oldSources = m_activeSources;
m_activeSources.push_back(new_source);
reportSiteChange(oldSources, m_activeSources);
} else {
new_source = m_activeSources[0];
}
new_source->handle(c_ptr);
}
static void consumeChunkFront(size_t &front,
std::vector<IOPosBuffer> &input,
std::vector<IOPosBuffer> &output,
IOSize chunksize) {
while ((chunksize > 0) && (front < input.size()) && (output.size() <= XRD_ADAPTOR_CHUNK_THRESHOLD)) {
IOPosBuffer &io = input[front];
IOPosBuffer &outio = output.back();
if (io.size() > chunksize) {
IOSize consumed;
if (!output.empty() && (outio.size() < XRD_CL_MAX_CHUNK) &&
(outio.offset() + static_cast<IOOffset>(outio.size()) == io.offset())) {
if (outio.size() + chunksize > XRD_CL_MAX_CHUNK) {
consumed = (XRD_CL_MAX_CHUNK - outio.size());
outio.set_size(XRD_CL_MAX_CHUNK);
} else {
consumed = chunksize;
outio.set_size(outio.size() + consumed);
}
} else {
consumed = chunksize;
output.emplace_back(IOPosBuffer(io.offset(), io.data(), chunksize));
}
chunksize -= consumed;
IOSize newsize = io.size() - consumed;
IOOffset newoffset = io.offset() + consumed;
void *newdata = static_cast<char *>(io.data()) + consumed;
io.set_offset(newoffset);
io.set_data(newdata);
io.set_size(newsize);
} else if (io.size() == 0) {
front++;
} else {
output.push_back(io);
chunksize -= io.size();
front++;
}
}
}
static void consumeChunkBack(size_t front,
std::vector<IOPosBuffer> &input,
std::vector<IOPosBuffer> &output,
IOSize chunksize) {
while ((chunksize > 0) && (front < input.size()) && (output.size() <= XRD_ADAPTOR_CHUNK_THRESHOLD)) {
IOPosBuffer &io = input.back();
IOPosBuffer &outio = output.back();
if (io.size() > chunksize) {
IOSize consumed;
if (!output.empty() && (outio.size() < XRD_CL_MAX_CHUNK) &&
(outio.offset() + static_cast<IOOffset>(outio.size()) == io.offset())) {
if (outio.size() + chunksize > XRD_CL_MAX_CHUNK) {
consumed = (XRD_CL_MAX_CHUNK - outio.size());
outio.set_size(XRD_CL_MAX_CHUNK);
} else {
consumed = chunksize;
outio.set_size(outio.size() + consumed);
}
} else {
consumed = chunksize;
output.emplace_back(IOPosBuffer(io.offset(), io.data(), chunksize));
}
chunksize -= consumed;
IOSize newsize = io.size() - consumed;
IOOffset newoffset = io.offset() + consumed;
void *newdata = static_cast<char *>(io.data()) + consumed;
io.set_offset(newoffset);
io.set_data(newdata);
io.set_size(newsize);
} else if (io.size() == 0) {
input.pop_back();
} else {
output.push_back(io);
chunksize -= io.size();
input.pop_back();
}
}
}
static IOSize validateList(const std::vector<IOPosBuffer> req) {
IOSize total = 0;
off_t last_offset = -1;
for (const auto &it : req) {
total += it.size();
assert(it.offset() > last_offset);
last_offset = it.offset();
assert(it.size() <= XRD_CL_MAX_CHUNK);
assert(it.offset() < 0x1ffffffffff);
}
assert(req.size() <= 1024);
return total;
}
void XrdAdaptor::RequestManager::splitClientRequest(const std::vector<IOPosBuffer> &iolist,
std::vector<IOPosBuffer> &req1,
std::vector<IOPosBuffer> &req2,
std::vector<std::shared_ptr<Source>> const &activeSources) const {
if (iolist.empty())
return;
std::vector<IOPosBuffer> tmp_iolist(iolist.begin(), iolist.end());