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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/transaction_metrics_observer.h"
#include "mongo/db/server_transactions_metrics.h"
#include "mongo/db/transaction_participant.h"
namespace mongo {
void TransactionMetricsObserver::onStart(ServerTransactionsMetrics* serverTransactionsMetrics,
bool isAutoCommit,
TickSource* tickSource,
Date_t curWallClockTime,
Date_t expireDate) {
//
// Per transaction metrics.
//
_singleTransactionStats.setStartTime(tickSource->getTicks(), curWallClockTime);
_singleTransactionStats.setAutoCommit(isAutoCommit);
_singleTransactionStats.setExpireDate(expireDate);
//
// Server wide transactions metrics.
//
serverTransactionsMetrics->incrementTotalStarted();
serverTransactionsMetrics->incrementCurrentOpen();
serverTransactionsMetrics->incrementCurrentInactive();
}
void TransactionMetricsObserver::onChooseReadTimestamp(Timestamp readTimestamp) {
_singleTransactionStats.setReadTimestamp(readTimestamp);
}
void TransactionMetricsObserver::onStash(ServerTransactionsMetrics* serverTransactionsMetrics,
TickSource* tickSource) {
//
// Per transaction metrics.
//
// The transaction operation may be trying to stash its resources when it has already been
// aborted by another thread, so we check that the transaction is active before setting it as
// inactive.
if (_singleTransactionStats.isActive()) {
_singleTransactionStats.setInactive(tickSource, tickSource->getTicks());
}
//
// Server wide transactions metrics.
//
// We accept possible slight inaccuracies in these counters from non-atomicity.
serverTransactionsMetrics->decrementCurrentActive();
serverTransactionsMetrics->incrementCurrentInactive();
}
void TransactionMetricsObserver::onUnstash(ServerTransactionsMetrics* serverTransactionsMetrics,
TickSource* tickSource) {
//
// Per transaction metrics.
//
_singleTransactionStats.setActive(tickSource->getTicks());
//
// Server wide transactions metrics.
//
// We accept possible slight inaccuracies in these counters from non-atomicity.
serverTransactionsMetrics->incrementCurrentActive();
serverTransactionsMetrics->decrementCurrentInactive();
}
void TransactionMetricsObserver::onCommit(ServerTransactionsMetrics* serverTransactionsMetrics,
TickSource* tickSource,
boost::optional<Timestamp> oldestOplogEntryTS,
Top* top) {
//
// Per transaction metrics.
//
// After the transaction has been committed, we must update the end time and mark it as
// inactive. We use the same "now" time to prevent skew in the time-related metrics.
auto curTick = tickSource->getTicks();
_singleTransactionStats.setEndTime(curTick);
// The transaction operation may have already been aborted by another thread, so we check that
// the transaction is active before setting it as inactive.
if (_singleTransactionStats.isActive()) {
_singleTransactionStats.setInactive(tickSource, curTick);
}
//
// Server wide transactions metrics.
//
serverTransactionsMetrics->incrementTotalCommitted();
serverTransactionsMetrics->decrementCurrentOpen();
serverTransactionsMetrics->decrementCurrentActive();
auto duration =
durationCount<Microseconds>(_singleTransactionStats.getDuration(tickSource, curTick));
top->incrementGlobalTransactionLatencyStats(static_cast<uint64_t>(duration));
// Remove this transaction's oldest oplog entry Timestamp if one was written.
if (oldestOplogEntryTS) {
serverTransactionsMetrics->removeActiveTS(*oldestOplogEntryTS);
}
}
void TransactionMetricsObserver::onAbortActive(ServerTransactionsMetrics* serverTransactionsMetrics,
TickSource* tickSource,
boost::optional<Timestamp> oldestOplogEntryTS,
Top* top) {
auto curTick = tickSource->getTicks();
_onAbort(serverTransactionsMetrics, curTick, tickSource, top);
//
// Per transaction metrics.
//
// The transaction operation may have already been aborted by another thread, so we check that
// the transaction is active before setting it as inactive.
if (_singleTransactionStats.isActive()) {
_singleTransactionStats.setInactive(tickSource, curTick);
}
//
// Server wide transactions metrics.
//
serverTransactionsMetrics->decrementCurrentActive();
// Remove this transaction's oldest oplog entry Timestamp if one was written.
if (oldestOplogEntryTS) {
serverTransactionsMetrics->removeActiveTS(*oldestOplogEntryTS);
}
}
void TransactionMetricsObserver::onAbortInactive(
ServerTransactionsMetrics* serverTransactionsMetrics,
TickSource* tickSource,
boost::optional<Timestamp> oldestOplogEntryTS,
Top* top) {
auto curTick = tickSource->getTicks();
_onAbort(serverTransactionsMetrics, curTick, tickSource, top);
//
// Server wide transactions metrics.
//
serverTransactionsMetrics->decrementCurrentInactive();
// Remove this transaction's oldest oplog entry Timestamp if one was written.
if (oldestOplogEntryTS) {
serverTransactionsMetrics->removeActiveTS(*oldestOplogEntryTS);
}
}
void TransactionMetricsObserver::onTransactionOperation(Client* client,
OpDebug::AdditiveMetrics additiveMetrics) {
// Add the latest operation stats to the aggregate OpDebug::AdditiveMetrics object stored in the
// SingleTransactionStats instance on the TransactionMetricsObserver.
_singleTransactionStats.getOpDebug()->additiveMetrics.add(additiveMetrics);
// Update the LastClientInfo object stored in the SingleTransactionStats instance on the
// TransactionMetricsObserver with this Client's information. This is the last client that ran a
// transaction operation on the txnParticipant.
_singleTransactionStats.updateLastClientInfo(client);
}
void TransactionMetricsObserver::_onAbort(ServerTransactionsMetrics* serverTransactionsMetrics,
TickSource::Tick curTick,
TickSource* tickSource,
Top* top) {
//
// Per transaction metrics.
//
_singleTransactionStats.setEndTime(curTick);
//
// Server wide transactions metrics.
//
serverTransactionsMetrics->incrementTotalAborted();
serverTransactionsMetrics->decrementCurrentOpen();
auto latency =
durationCount<Microseconds>(_singleTransactionStats.getDuration(tickSource, curTick));
top->incrementGlobalTransactionLatencyStats(static_cast<uint64_t>(latency));
}
void TransactionMetricsObserver::onPrepare(ServerTransactionsMetrics* serverTransactionsMetrics,
Timestamp prepareTimestamp) {
// Since we currently only write an oplog entry for an in progress transaction when it is in
// the prepare state, the prepareTimestamp is currently the oldest timestamp written to the
// oplog for this transaction.
serverTransactionsMetrics->addActiveTS(prepareTimestamp);
}
} // namespace mongo
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