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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "documentmetastoreflushtarget.h"
#include "documentmetastore.h"
#include <vespa/searchcore/proton/attribute/attributedisklayout.h>
#include <vespa/searchcore/proton/server/itlssyncer.h>
#include <vespa/searchcore/proton/attribute/attribute_directory.h>
#include <vespa/searchlib/attribute/attributefilesavetarget.h>
#include <vespa/searchlib/attribute/attributememorysavetarget.h>
#include <vespa/searchlib/attribute/attributesaver.h>
#include <vespa/searchlib/common/serialnumfileheadercontext.h>
#include <vespa/searchlib/util/filekit.h>
#include <filesystem>
#include <fstream>
#include <vespa/log/log.h>
LOG_SETUP(".proton.documentmetastore.documentmetastoreflushtarget");
using namespace search;
using namespace vespalib;
using search::common::FileHeaderContext;
using search::common::SerialNumFileHeaderContext;
using searchcorespi::IFlushTarget;
using searchcorespi::FlushStats;
namespace proton {
/**
* Task performing the actual flushing to disk.
**/
class DocumentMetaStoreFlushTarget::Flusher : public Task {
private:
DocumentMetaStoreFlushTarget &_dmsft;
std::unique_ptr<search::AttributeSaver> _saver;
uint64_t _syncToken;
vespalib::string _flushDir;
bool saveDocumentMetaStore(); // not updating snap info.
public:
Flusher(DocumentMetaStoreFlushTarget &dmsft, uint64_t syncToken, AttributeDirectory::Writer &writer);
~Flusher() override;
bool flush(AttributeDirectory::Writer &writer);
void updateStats();
bool cleanUp(AttributeDirectory::Writer &writer);
void run() override;
SerialNum getFlushSerial() const override { return _syncToken; }
};
DocumentMetaStoreFlushTarget::Flusher::
Flusher(DocumentMetaStoreFlushTarget &dmsft,
SerialNum syncToken, AttributeDirectory::Writer &writer)
: _dmsft(dmsft),
_saver(),
_syncToken(syncToken),
_flushDir("")
{
// Called by document db executor
DocumentMetaStore &dms = *_dmsft._dms;
dms.commit(CommitParam(syncToken));
_flushDir = writer.getSnapshotDir(syncToken);
vespalib::string newBaseFileName(_flushDir + "/" + dms.getName());
_saver = dms.initSave(newBaseFileName);
assert(_saver);
}
DocumentMetaStoreFlushTarget::Flusher::~Flusher() = default;
bool
DocumentMetaStoreFlushTarget::Flusher::saveDocumentMetaStore()
{
std::filesystem::create_directory(std::filesystem::path(_flushDir));
SerialNumFileHeaderContext fileHeaderContext(_dmsft._fileHeaderContext, _syncToken);
bool saveSuccess = false;
if (_dmsft._hwInfo.disk().slow()) {
search::AttributeMemorySaveTarget memorySaveTarget;
saveSuccess = _saver->save(memorySaveTarget);
_saver.reset();
if (saveSuccess) {
saveSuccess = memorySaveTarget.writeToFile(_dmsft._tuneFileAttributes, fileHeaderContext);
}
} else {
search::AttributeFileSaveTarget saveTarget(_dmsft._tuneFileAttributes, fileHeaderContext);
saveSuccess = _saver->save(saveTarget);
_saver.reset();
}
return saveSuccess;
}
bool
DocumentMetaStoreFlushTarget::Flusher::flush(AttributeDirectory::Writer &writer)
{
writer.createInvalidSnapshot(_syncToken);
if (!saveDocumentMetaStore()) {
vespalib::string baseFileName(_flushDir + "/" + _dmsft._dms->getName());
LOG(warning, "Could not write document meta store '%s' to disk", baseFileName.c_str());
return false;
}
/*
* Sync transaction log again. This is needed when background
* flush is activated to ensure that same future will occur that has
* already been observable in the saved document meta store (future
* timestamp or bucket id).
*
* Assume only flush engine tries to flush document meta store, i.e.
* noone else tries to get writer while flush task is flushing
* document meta store to disk.
*/
_dmsft._tlsSyncer.sync();
writer.markValidSnapshot(_syncToken);
writer.setLastFlushTime(search::FileKit::getModificationTime(_flushDir));
return true;
}
void
DocumentMetaStoreFlushTarget::Flusher::updateStats()
{
_dmsft._lastStats.setPath(_flushDir);
}
bool
DocumentMetaStoreFlushTarget::Flusher::cleanUp(AttributeDirectory::Writer &writer)
{
if (_dmsft._cleanUpAfterFlush) {
writer.invalidateOldSnapshots();
writer.removeInvalidSnapshots();
}
return true;
}
void
DocumentMetaStoreFlushTarget::Flusher::run()
{
auto writer = _dmsft._dmsDir->tryGetWriter();
if (!writer || _syncToken <= _dmsft.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 ?
}
}
DocumentMetaStoreFlushTarget::
DocumentMetaStoreFlushTarget(const DocumentMetaStore::SP dms, ITlsSyncer &tlsSyncer,
const vespalib::string & baseDir, const TuneFileAttributes &tuneFileAttributes,
const FileHeaderContext &fileHeaderContext, const HwInfo &hwInfo)
: LeafFlushTarget("documentmetastore.flush", Type::SYNC, Component::ATTRIBUTE),
_dms(dms),
_tlsSyncer(tlsSyncer),
_baseDir(baseDir),
_cleanUpAfterFlush(true),
_lastStats(),
_tuneFileAttributes(tuneFileAttributes),
_fileHeaderContext(fileHeaderContext),
_hwInfo(hwInfo),
_diskLayout(AttributeDiskLayout::createSimple(baseDir)),
_dmsDir(_diskLayout->createAttributeDir(""))
{
_lastStats.setPathElementsToLog(8);
}
DocumentMetaStoreFlushTarget::~DocumentMetaStoreFlushTarget() = default;
TransientResourceUsage
DocumentMetaStoreFlushTarget::get_transient_resource_usage() const
{
return _dmsDir->get_transient_resource_usage();
}
IFlushTarget::SerialNum
DocumentMetaStoreFlushTarget::getFlushedSerialNum() const
{
return _dmsDir->getFlushedSerialNum();
}
IFlushTarget::MemoryGain
DocumentMetaStoreFlushTarget::getApproxMemoryGain() const
{
int64_t used(_dms->getStatus().getUsed());
return MemoryGain(used, used);
}
IFlushTarget::DiskGain
DocumentMetaStoreFlushTarget::getApproxDiskGain() const
{
return DiskGain(0, 0);
}
IFlushTarget::Time
DocumentMetaStoreFlushTarget::getLastFlushTime() const
{
return _dmsDir->getLastFlushTime();
}
IFlushTarget::Task::UP
DocumentMetaStoreFlushTarget::initFlush(SerialNum currentSerial, std::shared_ptr<search::IFlushToken>)
{
// Called by document db executor
_dms->reclaim_unused_memory();
SerialNum syncToken = std::max(currentSerial, _dms->getStatus().getLastSyncToken());
auto writer = _dmsDir->tryGetWriter();
if (!writer) {
return Task::UP();
}
if (syncToken <= getFlushedSerialNum()) {
writer->setLastFlushTime(vespalib::system_clock::now());
LOG(debug, "No document meta store 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);
}
uint64_t
DocumentMetaStoreFlushTarget::getApproxBytesToWriteToDisk() const
{
auto guard = _dms->getGuard();
return _dms->getEstimatedSaveByteSize();
}
} // namespace proton
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