Status WiredTigerSnapshotManager::setTransactionReadTimestamp(Timestamp pointInTime,
WT_SESSION* session,
bool roundToOldest) const {
char readTSConfigString[15 /* read_timestamp= */ + 16 /* 16 hexadecimal digits */ +
17 /* ,round_to_oldest= */ + 5 /* false */ + 1 /* trailing null */];
auto size = std::snprintf(readTSConfigString,
sizeof(readTSConfigString),
"read_timestamp=%llx,round_to_oldest=%s",
pointInTime.asULL(),
(roundToOldest) ? "true" : "false");
if (size < 0) {
int e = errno;
error() << "error snprintf " << errnoWithDescription(e);
fassertFailedNoTrace(40664);
}
invariant(static_cast<std::size_t>(size) < sizeof(readTSConfigString));
return wtRCToStatus(session->timestamp_transaction(session, readTSConfigString));
}
Status WiredTigerRecoveryUnit::setTimestamp(Timestamp timestamp) {
_ensureSession();
LOG(3) << "WT set timestamp of future write operations to " << timestamp;
WT_SESSION* session = _session->getSession();
invariant(_inUnitOfWork(), toString(_state));
invariant(_prepareTimestamp.isNull());
invariant(_commitTimestamp.isNull(),
str::stream() << "Commit timestamp set to " << _commitTimestamp.toString()
<< " and trying to set WUOW timestamp to "
<< timestamp.toString());
_lastTimestampSet = timestamp;
// Starts the WT transaction associated with this session.
getSession();
const std::string conf = "commit_timestamp=" + integerToHex(timestamp.asULL());
auto rc = session->timestamp_transaction(session, conf.c_str());
if (rc == 0) {
_isTimestamped = true;
}
return wtRCToStatus(rc, "timestamp_transaction");
}
void WiredTigerOplogManager::setOplogReadTimestamp(Timestamp ts) {
stdx::lock_guard<stdx::mutex> lk(_oplogVisibilityStateMutex);
_setOplogReadTimestamp(lk, ts.asULL());
}
