void TimestampOrderingTransactionManager::PerformInsert(
TransactionContext *const current_txn, const ItemPointer &location,
ItemPointer *index_entry_ptr) {
PELOTON_ASSERT(!current_txn->IsReadOnly());
oid_t tile_group_id = location.block;
oid_t tuple_id = location.offset;
auto storage_manager = storage::StorageManager::GetInstance();
auto tile_group_header = storage_manager->GetTileGroup(tile_group_id)->GetHeader();
auto transaction_id = current_txn->GetTransactionId();
// check MVCC info
// the tuple slot must be empty.
PELOTON_ASSERT(tile_group_header->GetTransactionId(tuple_id) ==
INVALID_TXN_ID);
PELOTON_ASSERT(tile_group_header->GetBeginCommitId(tuple_id) == MAX_CID);
PELOTON_ASSERT(tile_group_header->GetEndCommitId(tuple_id) == MAX_CID);
tile_group_header->SetTransactionId(tuple_id, transaction_id);
tile_group_header->SetLastReaderCommitId(tuple_id,
current_txn->GetCommitId());
// no need to set next item pointer.
// Add the new tuple into the insert set
current_txn->RecordInsert(location);
// Write down the head pointer's address in tile group header
tile_group_header->SetIndirection(tuple_id, index_entry_ptr);
}
void TimestampOrderingTransactionManager::PerformInsert(
TransactionContext *const current_txn, const ItemPointer &location,
ItemPointer *index_entry_ptr) {
PL_ASSERT(current_txn->GetIsolationLevel() != IsolationLevelType::READ_ONLY);
oid_t tile_group_id = location.block;
oid_t tuple_id = location.offset;
auto &manager = catalog::Manager::GetInstance();
auto tile_group_header = manager.GetTileGroup(tile_group_id)->GetHeader();
auto transaction_id = current_txn->GetTransactionId();
// check MVCC info
// the tuple slot must be empty.
PL_ASSERT(tile_group_header->GetTransactionId(tuple_id) == INVALID_TXN_ID);
PL_ASSERT(tile_group_header->GetBeginCommitId(tuple_id) == MAX_CID);
PL_ASSERT(tile_group_header->GetEndCommitId(tuple_id) == MAX_CID);
tile_group_header->SetTransactionId(tuple_id, transaction_id);
// no need to set next item pointer.
// Add the new tuple into the insert set
current_txn->RecordInsert(location);
InitTupleReserved(tile_group_header, tuple_id);
// Write down the head pointer's address in tile group header
tile_group_header->SetIndirection(tuple_id, index_entry_ptr);
// Increment table insert op stats
if (static_cast<StatsType>(settings::SettingsManager::GetInt(settings::SettingId::stats_mode)) !=
StatsType::INVALID) {
stats::BackendStatsContext::GetInstance()->IncrementTableInserts(
location.block);
}
}
void TimestampOrderingTransactionManager::PerformUpdate(
TransactionContext *const current_txn, const ItemPointer &location,
const ItemPointer &new_location) {
PL_ASSERT(current_txn->GetIsolationLevel() != IsolationLevelType::READ_ONLY);
ItemPointer old_location = location;
LOG_TRACE("Performing Update old tuple %u %u", old_location.block,
old_location.offset);
LOG_TRACE("Performing Update new tuple %u %u", new_location.block,
new_location.offset);
auto &manager = catalog::Manager::GetInstance();
auto tile_group_header =
manager.GetTileGroup(old_location.block)->GetHeader();
auto new_tile_group_header =
manager.GetTileGroup(new_location.block)->GetHeader();
auto transaction_id = current_txn->GetTransactionId();
// if we can perform update, then we must have already locked the older
// version.
PL_ASSERT(tile_group_header->GetTransactionId(old_location.offset) ==
transaction_id);
PL_ASSERT(tile_group_header->GetPrevItemPointer(old_location.offset)
.IsNull() == true);
// check whether the new version is empty.
PL_ASSERT(new_tile_group_header->GetTransactionId(new_location.offset) ==
INVALID_TXN_ID);
PL_ASSERT(new_tile_group_header->GetBeginCommitId(new_location.offset) ==
MAX_CID);
PL_ASSERT(new_tile_group_header->GetEndCommitId(new_location.offset) ==
MAX_CID);
// if the executor doesn't call PerformUpdate after AcquireOwnership,
// no one will possibly release the write lock acquired by this txn.
// Set double linked list
tile_group_header->SetPrevItemPointer(old_location.offset, new_location);
new_tile_group_header->SetNextItemPointer(new_location.offset, old_location);
new_tile_group_header->SetTransactionId(new_location.offset, transaction_id);
// we should guarantee that the newer version is all set before linking the
// newer version to older version.
COMPILER_MEMORY_FENCE;
InitTupleReserved(new_tile_group_header, new_location.offset);
// we must be updating the latest version.
// Set the header information for the new version
ItemPointer *index_entry_ptr =
tile_group_header->GetIndirection(old_location.offset);
// if there's no primary index on a table, then index_entry_ptr == nullptr.
if (index_entry_ptr != nullptr) {
new_tile_group_header->SetIndirection(new_location.offset, index_entry_ptr);
// Set the index header in an atomic way.
// We do it atomically because we don't want any one to see a half-done
// pointer.
// In case of contention, no one can update this pointer when we are
// updating it
// because we are holding the write lock. This update should success in
// its first trial.
UNUSED_ATTRIBUTE auto res =
AtomicUpdateItemPointer(index_entry_ptr, new_location);
PL_ASSERT(res == true);
}
// Add the old tuple into the update set
current_txn->RecordUpdate(old_location);
// Increment table update op stats
if (static_cast<StatsType>(settings::SettingsManager::GetInt(settings::SettingId::stats_mode)) !=
StatsType::INVALID) {
stats::BackendStatsContext::GetInstance()->IncrementTableUpdates(
new_location.block);
}
}