// Return false if the tuple's table (tile group) is dropped.
// In such case, this recycled tuple can not be added to the recycled_list.
// Since no one will use it any more, keeping track of it is useless.
// Note that, if we drop a single tile group without dropping the whole table,
// such assumption is problematic.
bool GCManager::ResetTuple(const TupleMetadata &tuple_metadata) {
auto &manager = catalog::Manager::GetInstance();
auto tile_group = manager.GetTileGroup(tuple_metadata.tile_group_id);
// During the resetting, a table may deconstruct because of the DROP TABLE request
if (tile_group == nullptr) {
LOG_TRACE("Garbage tuple(%u, %u) in table %u no longer exists",
tuple_metadata.tile_group_id, tuple_metadata.tuple_slot_id,
tuple_metadata.table_id);
return false;
}
// From now on, the tile group shared pointer is held by us
// It's safe to set headers from now on.
auto tile_group_header = tile_group->GetHeader();
// Reset the header
tile_group_header->SetTransactionId(tuple_metadata.tuple_slot_id,
INVALID_TXN_ID);
tile_group_header->SetBeginCommitId(tuple_metadata.tuple_slot_id, MAX_CID);
tile_group_header->SetEndCommitId(tuple_metadata.tuple_slot_id, MAX_CID);
tile_group_header->SetPrevItemPointer(tuple_metadata.tuple_slot_id,
INVALID_ITEMPOINTER);
tile_group_header->SetNextItemPointer(tuple_metadata.tuple_slot_id,
INVALID_ITEMPOINTER);
PL_MEMSET(
tile_group_header->GetReservedFieldRef(tuple_metadata.tuple_slot_id), 0,
storage::TileGroupHeader::GetReservedSize());
LOG_TRACE("Garbage tuple(%u, %u) in table %u is reset",
tuple_metadata.tile_group_id, tuple_metadata.tuple_slot_id,
tuple_metadata.table_id);
return true;
}
bool TransactionLevelGCManager::ResetTuple(const ItemPointer &location) {
auto &manager = catalog::Manager::GetInstance();
auto tile_group = manager.GetTileGroup(location.block).get();
auto tile_group_header = tile_group->GetHeader();
// Reset the header
tile_group_header->SetTransactionId(location.offset, INVALID_TXN_ID);
tile_group_header->SetBeginCommitId(location.offset, MAX_CID);
tile_group_header->SetEndCommitId(location.offset, MAX_CID);
tile_group_header->SetPrevItemPointer(location.offset, INVALID_ITEMPOINTER);
tile_group_header->SetNextItemPointer(location.offset, INVALID_ITEMPOINTER);
PL_MEMSET(
tile_group_header->GetReservedFieldRef(location.offset), 0,
storage::TileGroupHeader::GetReservedSize());
// Reclaim the varlen pool
CheckAndReclaimVarlenColumns(tile_group, location.offset);
LOG_TRACE("Garbage tuple(%u, %u) is reset", location.block, location.offset);
return true;
}
