TileGroupHeader::TileGroupHeader(BackendType backend_type, int tuple_count)
: backend_type(backend_type),
data(nullptr),
num_tuple_slots(tuple_count),
next_tuple_slot(0) {
header_size = num_tuple_slots * header_entry_size;
// allocate storage space for header
auto &storage_manager = storage::StorageManager::GetInstance();
data = reinterpret_cast<char *>(
storage_manager.Allocate(backend_type, header_size));
assert(data != nullptr);
// zero out the data
std::memset(data, 0, header_size);
// Set MVCC Initial Value
for (oid_t tuple_slot_id = START_OID; tuple_slot_id < num_tuple_slots;
tuple_slot_id++) {
SetTransactionId(tuple_slot_id, INVALID_TXN_ID);
SetBeginCommitId(tuple_slot_id, MAX_CID);
SetEndCommitId(tuple_slot_id, MAX_CID);
SetInsertCommit(tuple_slot_id, false);
SetDeleteCommit(tuple_slot_id, false);
}
}
TileGroupHeader::TileGroupHeader(const BackendType &backend_type,
const int &tuple_count)
: backend_type(backend_type),
data(nullptr),
num_tuple_slots(tuple_count),
next_tuple_slot(0),
tile_header_lock() {
header_size = num_tuple_slots * header_entry_size;
// allocate storage space for header
auto &storage_manager = storage::StorageManager::GetInstance();
data = reinterpret_cast<char *>(
storage_manager.Allocate(backend_type, header_size));
PL_ASSERT(data != nullptr);
// zero out the data
PL_MEMSET(data, 0, header_size);
// Set MVCC Initial Value
for (oid_t tuple_slot_id = START_OID; tuple_slot_id < num_tuple_slots;
tuple_slot_id++) {
SetTransactionId(tuple_slot_id, INVALID_TXN_ID);
SetBeginCommitId(tuple_slot_id, MAX_CID);
SetEndCommitId(tuple_slot_id, MAX_CID);
SetNextItemPointer(tuple_slot_id, INVALID_ITEMPOINTER);
SetPrevItemPointer(tuple_slot_id, INVALID_ITEMPOINTER);
SetInsertCommit(tuple_slot_id, false); // unused
SetDeleteCommit(tuple_slot_id, false); // unused
}
}
std::pair<cid_t, storage::TileGroupHeader *>
WriteBehindFrontendLogger::SetInsertCommitMark(ItemPointer location) {
auto &manager = catalog::Manager::GetInstance();
auto tile_group = manager.GetTileGroup(location.block);
assert(tile_group != nullptr);
auto tile_group_header = tile_group->GetHeader();
assert(tile_group_header != nullptr);
// Set the commit mark
tile_group_header->SetInsertCommit(location.offset, true);
LOG_TRACE("<%p, %lu> : slot is insert committed", tile_group.get(),
location.offset);
// Update max oid
if (max_oid < location.block) {
max_oid = location.block;
}
auto begin_commit_id = tile_group_header->GetBeginCommitId(location.offset);
return std::make_pair(begin_commit_id, tile_group_header);
}