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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "prepare_restart_flush_strategy.h"
#include "flush_target_candidates.h"
#include "flush_target_candidate.h"
#include "tls_stats_map.h"
#include <sstream>
#include <algorithm>
#include <vespa/log/log.h>
LOG_SETUP(".proton.flushengine.prepare_restart_flush_strategy");
namespace proton {
using search::SerialNum;
using searchcorespi::IFlushTarget;
using Config = PrepareRestartFlushStrategy::Config;
using FlushContextsMap = std::map<vespalib::string, FlushContext::List>;
using FlushTargetCandidatesList = std::vector<FlushTargetCandidates::UP>;
PrepareRestartFlushStrategy::Config::Config(double tlsReplayByteCost_,
double tlsReplayOperationCost_,
double flushTargetWriteCost_)
: tlsReplayByteCost(tlsReplayByteCost_),
tlsReplayOperationCost(tlsReplayOperationCost_),
flushTargetWriteCost(flushTargetWriteCost_)
{
}
PrepareRestartFlushStrategy::PrepareRestartFlushStrategy(const Config &cfg)
: _cfg(cfg)
{
}
namespace {
FlushContext::List
removeGCFlushTargets(const FlushContext::List &flushContexts)
{
FlushContext::List result;
for (const auto &flushContext : flushContexts) {
if (flushContext->getTarget()->getType() != IFlushTarget::Type::GC) {
result.push_back(flushContext);
}
}
return result;
}
FlushContextsMap
groupByFlushHandler(const FlushContext::List &flushContexts)
{
FlushContextsMap result;
for (const auto &flushContext : flushContexts) {
const vespalib::string &handlerName = flushContext->getHandler()->getName();
result[handlerName].push_back(flushContext);
}
return result;
}
FlushContext::List
flatten(const FlushContextsMap &flushContextsPerHandler)
{
FlushContext::List result;
for (const auto &entry : flushContextsPerHandler) {
for (const auto &flushContext : entry.second) {
result.push_back(flushContext);
}
}
return result;
}
void
sortByOldestFlushedSerialNumber(std::vector<FlushTargetCandidate>& candidates)
{
std::sort(candidates.begin(), candidates.end(),
[](const auto &lhs, const auto &rhs) {
if (lhs.get_flushed_serial() == rhs.get_flushed_serial()) {
return lhs.get_flush_context()->getName() < rhs.get_flush_context()->getName();
}
return lhs.get_flushed_serial() < rhs.get_flushed_serial();
});
}
vespalib::string
toString(const FlushContext::List &flushContexts)
{
std::ostringstream oss;
bool first = true;
for (const auto &flushContext : flushContexts) {
if (!first) {
oss << ",";
}
oss << "'" << flushContext->getName() << "'";
first = false;
}
return oss.str();
}
FlushContext::List
findBestTargetsToFlush(const FlushContext::List &unsortedFlushContexts,
const flushengine::TlsStats &tlsStats,
const Config &cfg)
{
std::vector<FlushTargetCandidate> candidates;
candidates.reserve(unsortedFlushContexts.size());
for (const auto &flush_context : unsortedFlushContexts) {
candidates.emplace_back(flush_context, tlsStats.getLastSerial(), cfg);
}
sortByOldestFlushedSerialNumber(candidates);
FlushTargetCandidates bestSet(candidates, 0, tlsStats, cfg);
for (size_t numCandidates = 1; numCandidates <= candidates.size(); ++numCandidates) {
FlushTargetCandidates nextSet(candidates, numCandidates, tlsStats, cfg);
LOG(debug, "findBestTargetsToFlush(): Created candidate set: "
"flushTargets=[%s], tlsReplayBytesCost=%f, tlsReplayOperationsCost=%f, flushTargetsWriteCost=%f, totalCost=%f",
toString(nextSet.getCandidates()).c_str(),
nextSet.getTlsReplayCost().bytesCost,
nextSet.getTlsReplayCost().operationsCost,
nextSet.getFlushTargetsWriteCost(),
nextSet.getTotalCost());
if (nextSet.getTotalCost() < bestSet.getTotalCost()) {
bestSet = nextSet;
}
}
LOG(info, "findBestTargetsToFlush(): Best candidate set: "
"flushTargets=[%s], tlsReplayBytesCost=%f, tlsReplayOperationsCost=%f, flushTargetsWriteCost=%f, totalCost=%f",
toString(bestSet.getCandidates()).c_str(),
bestSet.getTlsReplayCost().bytesCost,
bestSet.getTlsReplayCost().operationsCost,
bestSet.getFlushTargetsWriteCost(),
bestSet.getTotalCost());
return bestSet.getCandidates();
}
FlushContextsMap
findBestTargetsToFlushPerHandler(const FlushContextsMap &flushContextsPerHandler,
const Config &cfg,
const flushengine::TlsStatsMap &tlsStatsMap)
{
FlushContextsMap result;
for (const auto &entry : flushContextsPerHandler) {
const auto &handlerName = entry.first;
const auto &flushContexts = entry.second;
const auto &tlsStats = tlsStatsMap.getTlsStats(handlerName);
result.insert(std::make_pair(handlerName,
findBestTargetsToFlush(flushContexts, tlsStats, cfg)));
}
return result;
}
}
FlushContext::List
PrepareRestartFlushStrategy::getFlushTargets(const FlushContext::List &targetList,
const flushengine::TlsStatsMap &tlsStatsMap,
const flushengine::ActiveFlushStats&) const
{
return flatten(findBestTargetsToFlushPerHandler(
groupByFlushHandler(removeGCFlushTargets(targetList)),
_cfg, tlsStatsMap));
}
} // namespace proton
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