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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "flushableattribute.h"
#include "attributedisklayout.h"
#include "attribute_directory.h"
#include <vespa/searchlib/attribute/attributefilesavetarget.h>
#include <vespa/searchlib/attribute/attributesaver.h>
#include <vespa/searchlib/util/filekit.h>
#include <vespa/vespalib/io/fileutil.h>
#include <vespa/searchlib/common/serialnumfileheadercontext.h>
#include <vespa/searchlib/attribute/attributememorysavetarget.h>
#include <vespa/searchlib/attribute/attributevector.h>
#include <vespa/searchcommon/attribute/config.h>
#include <vespa/vespalib/util/isequencedtaskexecutor.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <filesystem>
#include <fstream>
#include <future>
#include <vespa/log/log.h>
LOG_SETUP(".proton.attribute.flushableattribute");
using namespace search;
using namespace vespalib;
using search::common::FileHeaderContext;
using search::common::SerialNumFileHeaderContext;
using searchcorespi::IFlushTarget;
namespace proton {
/**
* Task performing the actual flushing to disk.
**/
class FlushableAttribute::Flusher : public Task {
private:
FlushableAttribute & _fattr;
search::AttributeMemorySaveTarget _saveTarget;
std::unique_ptr<search::AttributeSaver> _saver;
uint64_t _syncToken;
vespalib::string _flushFile;
bool saveAttribute(); // not updating snap info.
public:
Flusher(FlushableAttribute & fattr, uint64_t syncToken, AttributeDirectory::Writer &writer);
~Flusher() override;
uint64_t getSyncToken() const { return _syncToken; }
bool flush(AttributeDirectory::Writer &writer);
void updateStats();
bool cleanUp(AttributeDirectory::Writer &writer);
// Implements vespalib::Executor::Task
void run() override;
SerialNum getFlushSerial() const override {
return _syncToken;
}
};
FlushableAttribute::Flusher::Flusher(FlushableAttribute & fattr, SerialNum syncToken, AttributeDirectory::Writer &writer)
: _fattr(fattr),
_saveTarget(),
_saver(),
_syncToken(syncToken),
_flushFile("")
{
fattr._attr->commit(CommitParam(syncToken));
AttributeVector &attr = *_fattr._attr;
// Called by attribute field writer executor
_flushFile = writer.getSnapshotDir(_syncToken) + "/" + attr.getName();
_saver = attr.initSave(_flushFile);
if (!_saver) {
// New style background save not available, use old style save.
attr.save(_saveTarget, _flushFile);
}
}
FlushableAttribute::Flusher::~Flusher() = default;
bool
FlushableAttribute::Flusher::saveAttribute()
{
std::filesystem::create_directory(std::filesystem::path(vespalib::dirname(_flushFile)));
SerialNumFileHeaderContext fileHeaderContext(_fattr._fileHeaderContext, _syncToken);
bool saveSuccess = true;
if (_saver && _saver->hasGenerationGuard() &&
_fattr._hwInfo.disk().slow()) {
saveSuccess = _saver->save(_saveTarget);
_saver.reset();
}
if (saveSuccess) {
if (_saver) {
search::AttributeFileSaveTarget saveTarget(_fattr._tuneFileAttributes, fileHeaderContext);
saveSuccess = _saver->save(saveTarget);
_saver.reset();
} else {
saveSuccess = _saveTarget.writeToFile(_fattr._tuneFileAttributes, fileHeaderContext);
}
}
return saveSuccess;
}
bool
FlushableAttribute::Flusher::flush(AttributeDirectory::Writer &writer)
{
writer.createInvalidSnapshot(_syncToken);
if (!saveAttribute()) {
LOG(warning, "Could not write attribute vector '%s' to disk", _flushFile.c_str());
return false;
}
writer.markValidSnapshot(_syncToken);
writer.setLastFlushTime(search::FileKit::getModificationTime(vespalib::dirname(_flushFile)));
return true;
}
void
FlushableAttribute::Flusher::updateStats()
{
_fattr._lastStats.setPath(vespalib::dirname(_flushFile));
}
bool
FlushableAttribute::Flusher::cleanUp(AttributeDirectory::Writer &writer)
{
if (_fattr._cleanUpAfterFlush) {
writer.invalidateOldSnapshots();
writer.removeInvalidSnapshots();
}
return true;
}
void
FlushableAttribute::Flusher::run()
{
auto writer = _fattr._attrDir->tryGetWriter();
if (!writer || _syncToken <= _fattr.getFlushedSerialNum()) {
// another flusher has created an equal or better snapshot
// after this flusher was created
return;
}
if (!flush(*writer)) {
// TODO (geirst): throw exception ?
}
updateStats();
if (!cleanUp(*writer)) {
// TODO (geirst): throw exception ?
}
}
FlushableAttribute::FlushableAttribute(const AttributeVectorSP attr,
const std::shared_ptr<AttributeDirectory> &attrDir,
const TuneFileAttributes &
tuneFileAttributes,
const FileHeaderContext &
fileHeaderContext,
vespalib::ISequencedTaskExecutor &
attributeFieldWriter,
const HwInfo &hwInfo)
: IFlushTarget(make_string("attribute.flush.%s", attr->getName().c_str()), Type::SYNC, Component::ATTRIBUTE),
_attr(attr),
_cleanUpAfterFlush(true),
_lastStats(),
_tuneFileAttributes(tuneFileAttributes),
_fileHeaderContext(fileHeaderContext),
_attributeFieldWriter(attributeFieldWriter),
_hwInfo(hwInfo),
_attrDir(attrDir),
_replay_operation_cost(0.0)
{
_lastStats.setPathElementsToLog(8);
auto &config = attr->getConfig();
if (config.basicType() == search::attribute::BasicType::Type::TENSOR &&
config.tensorType().is_dense() && config.hnsw_index_params().has_value())
{
_replay_operation_cost = 400.0; // replaying operations to hnsw index is 400 times more expensive than reading from tls
}
}
FlushableAttribute::~FlushableAttribute() = default;
IFlushTarget::SerialNum
FlushableAttribute::getFlushedSerialNum() const
{
return _attrDir->getFlushedSerialNum();
}
IFlushTarget::MemoryGain
FlushableAttribute::getApproxMemoryGain() const
{
int64_t used(_attr->getStatus().getUsed());
return MemoryGain(used, used);
}
IFlushTarget::DiskGain
FlushableAttribute::getApproxDiskGain() const
{
return DiskGain(0, 0);
}
IFlushTarget::Time
FlushableAttribute::getLastFlushTime() const
{
return _attrDir->getLastFlushTime();
}
IFlushTarget::Task::UP
FlushableAttribute::internalInitFlush(SerialNum currentSerial)
{
// Called by attribute field writer thread while document db executor waits
_attr->removeAllOldGenerations();
SerialNum syncToken = std::max(currentSerial, _attr->getStatus().getLastSyncToken());
auto writer = _attrDir->tryGetWriter();
if (!writer) {
return Task::UP();
}
if (syncToken <= getFlushedSerialNum()) {
writer->setLastFlushTime(vespalib::system_clock::now());
LOG(debug,"No attribute vector to flush. Update flush time to current: lastFlushTime(%f)",
vespalib::to_s(getLastFlushTime().time_since_epoch()));
return Task::UP();
}
return std::make_unique<Flusher>(*this, syncToken, *writer);
}
IFlushTarget::Task::UP
FlushableAttribute::initFlush(SerialNum currentSerial, std::shared_ptr<search::IFlushToken>)
{
// Called by document db executor
std::promise<IFlushTarget::Task::UP> promise;
std::future<IFlushTarget::Task::UP> future = promise.get_future();
_attributeFieldWriter.execute(_attributeFieldWriter.getExecutorIdFromName(_attr->getNamePrefix()),
[&]() { promise.set_value(internalInitFlush(currentSerial)); });
return future.get();
}
uint64_t
FlushableAttribute::getApproxBytesToWriteToDisk() const
{
return _attr->getEstimatedSaveByteSize();
}
double
FlushableAttribute::get_replay_operation_cost() const
{
return _replay_operation_cost;
}
} // namespace proton
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