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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "memoryflush.h"
#include <vespa/searchcore/proton/flushengine/active_flush_stats.h>
#include <vespa/searchcore/proton/flushengine/tls_stats_map.h>
#include <vespa/vespalib/stllike/asciistream.h>
#include <vespa/vespalib/stllike/hash_set.h>
#include <vespa/vespalib/util/size_literals.h>
#include <vespa/vespalib/util/time.h>
#include <cinttypes>
#include <vespa/log/log.h>
LOG_SETUP(".proton.server.memoryflush");
using search::SerialNum;
using proton::flushengine::TlsStats;
using searchcorespi::IFlushTarget;
namespace proton {
namespace {
int64_t
getSerialDiff(SerialNum localLastSerial, const IFlushTarget &target)
{
return localLastSerial - target.getFlushedSerialNum();
}
uint64_t
estimateNeededTlsSizeForFlushTarget(const TlsStats &tlsStats, SerialNum flushedSerialNum)
{
if (flushedSerialNum < tlsStats.getFirstSerial()) {
return tlsStats.getNumBytes();
}
int64_t numEntries = tlsStats.getLastSerial() - tlsStats.getFirstSerial() + 1;
if (numEntries <= 0) {
return 0u;
}
if (flushedSerialNum >= tlsStats.getLastSerial()) {
return 0u;
}
double bytesPerEntry = static_cast<double>(tlsStats.getNumBytes()) / numEntries;
return bytesPerEntry * (tlsStats.getLastSerial() - flushedSerialNum);
}
}
MemoryFlush::Config::Config()
: maxGlobalMemory(4000_Mi),
maxGlobalTlsSize(20_Gi),
globalDiskBloatFactor(0.2),
maxMemoryGain(1000_Mi),
diskBloatFactor(0.2),
maxTimeGain(std::chrono::hours(24))
{ }
MemoryFlush::Config::Config(uint64_t maxGlobalMemory_in,
uint64_t maxGlobalTlsSize_in,
double globalDiskBloatFactor_in,
uint64_t maxMemoryGain_in,
double diskBloatFactor_in,
vespalib::duration maxTimeGain_in)
: maxGlobalMemory(maxGlobalMemory_in),
maxGlobalTlsSize(maxGlobalTlsSize_in),
globalDiskBloatFactor(globalDiskBloatFactor_in),
maxMemoryGain(maxMemoryGain_in),
diskBloatFactor(diskBloatFactor_in),
maxTimeGain(maxTimeGain_in)
{ }
vespalib::string
MemoryFlush::Config::toString() const {
vespalib::asciistream os;
os << "maxGlobalMemory=" << maxGlobalMemory << " ";
os << "maxGlobalTlsSize=" << maxGlobalTlsSize << " ";
os << "globalDiskBloatFactor=" << globalDiskBloatFactor << " ";
os << "maxMemoryGain=" << maxMemoryGain << " ";
os << "diskBloatFactor=" << diskBloatFactor << " ";
os << "maxTimeGain(ns)=" << maxTimeGain.count();
return os.str();
}
MemoryFlush::MemoryFlush(const Config &config, vespalib::system_time startTime)
: _lock(),
_config(config),
_startTime(startTime)
{ }
MemoryFlush::MemoryFlush()
: MemoryFlush(Config(), vespalib::system_clock::now())
{ }
MemoryFlush::~MemoryFlush() = default;
MemoryFlush::Config
MemoryFlush::getConfig() const
{
std::lock_guard<std::mutex> guard(_lock);
return _config;
}
void
MemoryFlush::setConfig(const Config &config)
{
std::lock_guard<std::mutex> guard(_lock);
_config = config;
}
namespace {
vespalib::string
getOrderName(MemoryFlush::OrderType &orderType)
{
switch (orderType) {
case MemoryFlush::OrderType::MEMORY: return "MEMORY";
case MemoryFlush::OrderType::TLSSIZE: return "TLSSIZE";
case MemoryFlush::OrderType::DISKBLOAT: return "DISKBLOAT";
case MemoryFlush::OrderType::MAXAGE: return "MAXAGE";
case MemoryFlush::OrderType::DEFAULT: return "DEFAULT";
}
return "DEFAULT";
}
size_t
computeGain(const IFlushTarget::DiskGain & gain) {
return std::max(INT64_C(100000000), std::max(gain.getBefore(), gain.getAfter()));
}
}
FlushContext::List
MemoryFlush::getFlushTargets(const FlushContext::List& targetList,
const flushengine::TlsStatsMap& tlsStatsMap,
const flushengine::ActiveFlushStats& active_flushes) const
{
OrderType order(DEFAULT);
uint64_t totalMemory(0);
IFlushTarget::DiskGain totalDisk;
uint64_t totalTlsSize(0);
const Config config(getConfig());
vespalib::hash_set<const void *> visitedHandlers;
vespalib::system_time now(vespalib::system_clock::now());
LOG(debug,
"getFlushTargets(): globalMaxMemory(%" PRIu64 "), maxGlobalTlsSize(%" PRIu64 "), globalDiskBloatFactor(%f), "
"maxMemoryGain(%" PRIu64 "), diskBloatFactor(%f), maxTimeGain(%f), startTime(%f)",
config.maxGlobalMemory, config.maxGlobalTlsSize, config.globalDiskBloatFactor,
config.maxMemoryGain, config.diskBloatFactor,
vespalib::to_s(config.maxTimeGain),
vespalib::to_s(_startTime.time_since_epoch()));
for (const auto & ctx : targetList) {
const IFlushTarget & target(*ctx->getTarget());
const IFlushHandler & handler(*ctx->getHandler());
int64_t mgain(std::max(INT64_C(0), target.getApproxMemoryGain().gain()));
const IFlushTarget::DiskGain dgain(target.getApproxDiskGain());
totalDisk += dgain;
SerialNum localLastSerial = ctx->getLastSerial();
int64_t serialDiff = getSerialDiff(localLastSerial, target);
vespalib::system_time lastFlushTime = target.getLastFlushTime();
vespalib::duration timeDiff(now - (lastFlushTime > vespalib::system_time() ? lastFlushTime : _startTime));
totalMemory += mgain;
const flushengine::TlsStats &tlsStats = tlsStatsMap.getTlsStats(handler.getName());
auto oldest_start_time = active_flushes.oldest_start_time(handler.getName());
// Don't consider TLSSIZE if there exists an active (ongoing) flush (for this flush handler)
// that started before the last flush time of the flush target to evaluate.
// Instead we should wait for the active (ongoing) flush to be finished before doing another evaluation.
if (!oldest_start_time.has_value() || lastFlushTime < oldest_start_time.value()) {
if (visitedHandlers.insert(&handler).second) {
totalTlsSize += tlsStats.getNumBytes();
if ((totalTlsSize > config.maxGlobalTlsSize) && (order < TLSSIZE)) {
order = TLSSIZE;
}
}
}
if ((mgain >= config.maxMemoryGain) && (order < MEMORY)) {
order = MEMORY;
} else if ((dgain.gain() > config.diskBloatFactor * computeGain(dgain)) && (order < DISKBLOAT)) {
order = DISKBLOAT;
} else if ((timeDiff >= config.maxTimeGain) && (order < MAXAGE)) {
order = MAXAGE;
}
LOG(debug,
"getFlushTargets(): target(%s), totalMemoryGain(%" PRIu64 "), memoryGain(%" PRIu64 "), "
"totalDiskGain(%" PRId64 "), diskGain(%" PRId64 "), "
"tlsSize(%" PRIu64 "), tlsSizeNeeded(%" PRIu64 "), "
"flushedSerial(%" PRIu64 "), localLastSerial(%" PRIu64 "), serialDiff(%" PRId64 "), "
"lastFlushTime(%fs), nowTime(%fs), timeDiff(%fs), order(%s)",
ctx->getName().c_str(), totalMemory, mgain,
totalDisk.gain(), dgain.gain(),
tlsStats.getNumBytes(), estimateNeededTlsSizeForFlushTarget(tlsStats, target.getFlushedSerialNum()),
target.getFlushedSerialNum(), localLastSerial, serialDiff,
vespalib::to_s(lastFlushTime.time_since_epoch()),
vespalib::to_s(now.time_since_epoch()),
vespalib::to_s(timeDiff),
getOrderName(order).c_str());
}
if (!targetList.empty()) {
if ((totalMemory >= config.maxGlobalMemory) && (order < MEMORY)) {
order = MEMORY;
}
if ((totalDisk.gain() > config.globalDiskBloatFactor * computeGain(totalDisk)) && (order < DISKBLOAT)) {
order = DISKBLOAT;
}
}
FlushContext::List fv(targetList);
std::sort(fv.begin(), fv.end(), CompareTarget(order, tlsStatsMap));
// No desired order and no urgent needs; no flush required at this moment.
if (order == DEFAULT &&
!fv.empty() &&
!fv[0]->getTarget()->needUrgentFlush()) {
LOG(debug, "getFlushTargets(): empty list");
return FlushContext::List();
}
if (LOG_WOULD_LOG(debug)) {
vespalib::asciistream oss;
for (size_t i = 0; i < fv.size(); ++i) {
if (i > 0) {
oss << ",";
}
oss << fv[i]->getName();
}
LOG(debug, "getFlushTargets(): %zu sorted targets: [%s]", fv.size(), oss.str().data());
}
return fv;
}
bool
MemoryFlush::CompareTarget::operator()(const FlushContext::SP &lfc, const FlushContext::SP &rfc) const
{
const IFlushTarget &lhs = *lfc->getTarget();
const IFlushTarget &rhs = *rfc->getTarget();
if (lhs.needUrgentFlush() != rhs.needUrgentFlush()) {
return lhs.needUrgentFlush();
}
switch (_order) {
case MEMORY:
return (lhs.getApproxMemoryGain().gain() > rhs.getApproxMemoryGain().gain());
case TLSSIZE: {
const flushengine::TlsStats &lhsTlsStats = _tlsStatsMap.getTlsStats(lfc->getHandler()->getName());
const flushengine::TlsStats &rhsTlsStats = _tlsStatsMap.getTlsStats(rfc->getHandler()->getName());
SerialNum lhsFlushedSerialNum(lhs.getFlushedSerialNum());
SerialNum rhsFlushedSerialNum(rhs.getFlushedSerialNum());
uint64_t lhsNeededTlsSize = estimateNeededTlsSizeForFlushTarget(lhsTlsStats, lhsFlushedSerialNum);
uint64_t rhsNeededTlsSize = estimateNeededTlsSizeForFlushTarget(rhsTlsStats, rhsFlushedSerialNum);
if (lhsNeededTlsSize != rhsNeededTlsSize) {
return (lhsNeededTlsSize > rhsNeededTlsSize);
}
return (lhs.getLastFlushTime() < rhs.getLastFlushTime());
}
case DISKBLOAT:
return (lhs.getApproxDiskGain().gain() > rhs.getApproxDiskGain().gain());
case MAXAGE:
return (lhs.getLastFlushTime() < rhs.getLastFlushTime());
default:
return (getSerialDiff(lfc->getLastSerial(), lhs) > getSerialDiff(rfc->getLastSerial(), rhs));
}
}
} // namespace proton
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