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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "documentmetastoresaver.h"
#include <vespa/searchlib/util/bufferwriter.h>
#include "document_meta_store_versions.h"
#include <vespa/searchlib/attribute/iattributesavetarget.h>
using vespalib::GenerationHandler;
using search::IAttributeSaveTarget;
namespace proton {
namespace {
/*
* Functor class to write meta data for a single lid. Note that during
* a background save with active feeding, timestamp, bucket used bits
* and size might reflect future values due to missing snapshot
* properties in RcuVector. Size might also reflect a mix between
* current and future value due to non-atomic access.
*/
class WriteMetaData
{
using MetaDataView = DocumentMetaStoreSaver::MetaDataView;
using GlobalId = documentmetastore::IStore::GlobalId;
using BucketId = documentmetastore::IStore::BucketId;
using Timestamp = documentmetastore::IStore::Timestamp;
search::BufferWriter &_datWriter;
MetaDataView _metaDataView;
bool _writeDocSize;
public:
WriteMetaData(search::BufferWriter &datWriter, MetaDataView metaDataView, bool writeDocSize)
: _datWriter(datWriter),
_metaDataView(metaDataView),
_writeDocSize(writeDocSize)
{ }
void operator()(documentmetastore::GidToLidMapKey key) {
auto lid = key.get_lid();
assert(lid < _metaDataView.size());
const RawDocumentMetaData &metaData = _metaDataView[lid];
const GlobalId &gid = metaData.getGid();
// 6 bits used for bucket bits
uint8_t bucketUsedBits = metaData.getBucketUsedBits();
assert(BucketId::validUsedBits(bucketUsedBits));
assert((bucketUsedBits >> BucketId::CountBits) == 0);
Timestamp timestamp = metaData.getTimestamp();
search::BufferWriter &datWriter(_datWriter);
datWriter.write(&lid, sizeof(lid));
datWriter.write(gid.get(), GlobalId::LENGTH);
datWriter.write(&bucketUsedBits, sizeof(bucketUsedBits));
if (_writeDocSize) {
uint32_t docSize = metaData.getDocSize();
assert(docSize < (1u << 24));
uint8_t docSizeLow = docSize;
uint16_t docSizeHigh = docSize >> 8;
datWriter.write(&docSizeLow, sizeof(docSizeLow));
datWriter.write(&docSizeHigh, sizeof(docSizeHigh));
}
datWriter.write(×tamp, sizeof(timestamp));
}
};
}
DocumentMetaStoreSaver::
DocumentMetaStoreSaver(vespalib::GenerationHandler::Guard &&guard,
const search::attribute::AttributeHeader &header,
const GidIterator &gidIterator,
MetaDataView metaDataView)
: AttributeSaver(std::move(guard), header),
_gidIterator(gidIterator),
_metaDataView(metaDataView),
_writeDocSize(true)
{
if (header.getVersion() == documentmetastore::NO_DOCUMENT_SIZE_TRACKING_VERSION) {
_writeDocSize = false;
}
}
DocumentMetaStoreSaver::~DocumentMetaStoreSaver() = default;
bool
DocumentMetaStoreSaver::onSave(IAttributeSaveTarget &saveTarget)
{
// write <lid,gid> pairs, sorted on gid
std::unique_ptr<search::BufferWriter>
datWriter(saveTarget.datWriter().allocBufferWriter());
_gidIterator.foreach_key(WriteMetaData(*datWriter, _metaDataView, _writeDocSize));
datWriter->flush();
return true;
}
} // namespace proton
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