void RocksSnapshotManager::setCommittedSnapshot(const SnapshotName& name) {
stdx::lock_guard<stdx::mutex> lock(_mutex);
uint64_t nameU64 = name.asU64();
invariant(!_committedSnapshot || *_committedSnapshot < nameU64);
_committedSnapshot = nameU64;
}
Status RocksSnapshotManager::createSnapshot(OperationContext* txn, const SnapshotName& name) {
stdx::lock_guard<stdx::mutex> lock(_mutex);
uint64_t nameU64 = name.asU64();
_snapshotMap[nameU64] = std::make_shared<SnapshotHolder>(txn, nameU64);
_snapshots.push_back(nameU64);
return Status::OK();
}
void WiredTigerSnapshotManager::beginTransactionAtTimestamp(SnapshotName pointInTime,
WT_SESSION* session) const {
char readTSConfigString[15 /* read_timestamp= */ + (8 * 2) /* 8 hexadecimal characters */ +
1 /* trailing null */];
auto size = std::snprintf(readTSConfigString,
sizeof(readTSConfigString),
"read_timestamp=%llx",
static_cast<unsigned long long>(pointInTime.asU64()));
invariant(static_cast<std::size_t>(size) < sizeof(readTSConfigString));
invariantWTOK(session->begin_transaction(session, readTSConfigString));
}
Status NarkDbSnapshotManager::createSnapshot(OperationContext* txn, const SnapshotName& name) {
auto session = NarkDbRecoveryUnit::get(txn)->getSession(txn)->getSession();
const std::string config = str::stream() << "name=" << name.asU64();
return narkDbRCToStatus(session->snapshot(session, config.c_str()));
}
Status WiredTigerSnapshotManager::createSnapshot(OperationContext* opCtx,
const SnapshotName& name) {
auto session = WiredTigerRecoveryUnit::get(opCtx)->getSession(opCtx)->getSession();
const std::string config = str::stream() << "name=" << name.asU64();
return wtRCToStatus(session->snapshot(session, config.c_str()));
}