SERVER-40228 Refactor OpTimeAndWallTime into new struct

23 files changed, 240 insertions, 251 deletions

diff --git a/src/mongo/db/repl/initial_syncer.cpp b/src/mongo/db/repl/initial_syncer.cpp
index 7183fb8b5f2..b074341d4a3 100644
--- a/src/mongo/db/repl/initial_syncer.cpp
+++ b/src/mongo/db/repl/initial_syncer.cpp
@@ -149,16 +149,15 @@ StatusWith<Timestamp> parseTimestampStatus(const QueryResponseStatus& fetchResul
     }
 }
 
-StatusWith<std::tuple<OpTime, Date_t>> parseOpTimeAndWallTime(
-    const QueryResponseStatus& fetchResult) {
+StatusWith<OpTimeAndWallTime> parseOpTimeAndWallTime(const QueryResponseStatus& fetchResult) {
     if (!fetchResult.isOK()) {
         return fetchResult.getStatus();
     }
     const auto docs = fetchResult.getValue().documents;
     const auto hasDoc = docs.begin() != docs.end();
     if (!hasDoc) {
-        return StatusWith<std::tuple<OpTime, Date_t>>{ErrorCodes::NoMatchingDocument,
-                                                      "no oplog entry found"};
+        return StatusWith<OpTimeAndWallTime>{ErrorCodes::NoMatchingDocument,
+                                             "no oplog entry found"};
     }
 
     auto opTimeStatus = OpTime::parseFromOplogEntry(docs.front());
@@ -169,7 +168,8 @@ StatusWith<std::tuple<OpTime, Date_t>> parseOpTimeAndWallTime(
     if (!wallTimeStatus.getStatus().isOK()) {
         return wallTimeStatus.getStatus();
     }
-    return std::make_tuple(opTimeStatus.getValue(), wallTimeStatus.getValue());
+    OpTimeAndWallTime result = {opTimeStatus.getValue(), wallTimeStatus.getValue()};
+    return result;
 }
 
 /**
@@ -320,7 +320,7 @@ InitialSyncer::State InitialSyncer::getState_forTest() const {
 
 Date_t InitialSyncer::getWallClockTime_forTest() const {
     stdx::lock_guard<stdx::mutex> lk(_mutex);
-    return std::get<1>(_lastApplied);
+    return _lastApplied.wallTime;
 }
 
 bool InitialSyncer::_isShuttingDown() const {
@@ -420,7 +420,7 @@ void InitialSyncer::_setUp_inlock(OperationContext* opCtx, std::uint32_t initial
 }
 
 void InitialSyncer::_tearDown_inlock(OperationContext* opCtx,
-                                     const StatusWith<std::tuple<OpTime, Date_t>>& lastApplied) {
+                                     const StatusWith<OpTimeAndWallTime>& lastApplied) {
     _stats.initialSyncEnd = _exec->now();
 
     // This might not be necessary if we failed initial sync.
@@ -430,7 +430,7 @@ void InitialSyncer::_tearDown_inlock(OperationContext* opCtx,
     if (!lastApplied.isOK()) {
         return;
     }
-    const auto lastAppliedOpTime = std::get<0>(lastApplied.getValue());
+    const auto lastAppliedOpTime = lastApplied.getValue().opTime;
 
     // A node coming out of initial sync must guarantee at least one oplog document is visible
     // such that others can sync from this node. Oplog visibility is not rigorously advanced
@@ -477,10 +477,9 @@ void InitialSyncer::_startInitialSyncAttemptCallback(
 
     // This completion guard invokes _finishInitialSyncAttempt on destruction.
     auto cancelRemainingWorkInLock = [this]() { _cancelRemainingWork_inlock(); };
-    auto finishInitialSyncAttemptFn =
-        [this](const StatusWith<std::tuple<OpTime, Date_t>>& lastApplied) {
-            _finishInitialSyncAttempt(lastApplied);
-        };
+    auto finishInitialSyncAttemptFn = [this](const StatusWith<OpTimeAndWallTime>& lastApplied) {
+        _finishInitialSyncAttempt(lastApplied);
+    };
     auto onCompletionGuard =
         std::make_shared<OnCompletionGuard>(cancelRemainingWorkInLock, finishInitialSyncAttemptFn);
 
@@ -495,7 +494,7 @@ void InitialSyncer::_startInitialSyncAttemptCallback(
 
     LOG(2) << "Resetting all optimes before starting this initial sync attempt.";
     _opts.resetOptimes();
-    _lastApplied = std::make_tuple(OpTime(), Date_t::min());
+    _lastApplied = {OpTime(), Date_t::min()};
     _lastFetched = {};
 
     LOG(2) << "Resetting feature compatibility version to last-stable. If the sync source is in "
@@ -732,7 +731,7 @@ void InitialSyncer::_lastOplogEntryFetcherCallbackForBeginApplyingTimestamp(
         return;
     }
 
-    const auto& lastOpTime = std::get<0>(opTimeResult.getValue());
+    const auto& lastOpTime = opTimeResult.getValue().opTime;
 
     BSONObjBuilder queryBob;
     queryBob.append("find", NamespaceString::kServerConfigurationNamespace.coll());
@@ -1025,7 +1024,7 @@ void InitialSyncer::_databasesClonerCallback(const Status& databaseClonerFinishS
 void InitialSyncer::_lastOplogEntryFetcherCallbackForStopTimestamp(
     const StatusWith<Fetcher::QueryResponse>& result,
     std::shared_ptr<OnCompletionGuard> onCompletionGuard) {
-    auto resultOpTimeAndWallTime = std::make_tuple(OpTime(), Date_t::min());
+    OpTimeAndWallTime resultOpTimeAndWallTime = {OpTime(), Date_t::min()};
     {
         stdx::lock_guard<stdx::mutex> lock(_mutex);
         auto status = _checkForShutdownAndConvertStatus_inlock(
@@ -1043,13 +1042,13 @@ void InitialSyncer::_lastOplogEntryFetcherCallbackForStopTimestamp(
         }
         resultOpTimeAndWallTime = optimeStatus.getValue();
 
-        _initialSyncState->stopTimestamp = std::get<0>(resultOpTimeAndWallTime).getTimestamp();
+        _initialSyncState->stopTimestamp = resultOpTimeAndWallTime.opTime.getTimestamp();
 
         // If the beginFetchingTimestamp is different from the stopTimestamp, it indicates that
         // there are oplog entries fetched by the oplog fetcher that need to be written to the oplog
         // and/or there are operations that need to be applied.
         if (_initialSyncState->beginFetchingTimestamp != _initialSyncState->stopTimestamp) {
-            invariant(std::get<0>(_lastApplied).isNull());
+            invariant(_lastApplied.opTime.isNull());
             _checkApplierProgressAndScheduleGetNextApplierBatch_inlock(lock, onCompletionGuard);
             return;
         }
@@ -1071,8 +1070,8 @@ void InitialSyncer::_lastOplogEntryFetcherCallbackForStopTimestamp(
         auto status = _storage->insertDocument(
             opCtx.get(),
             _opts.localOplogNS,
-            TimestampedBSONObj{oplogSeedDoc, std::get<0>(resultOpTimeAndWallTime).getTimestamp()},
-            std::get<0>(resultOpTimeAndWallTime).getTerm());
+            TimestampedBSONObj{oplogSeedDoc, resultOpTimeAndWallTime.opTime.getTimestamp()},
+            resultOpTimeAndWallTime.opTime.getTerm());
         if (!status.isOK()) {
             stdx::lock_guard<stdx::mutex> lock(_mutex);
             onCompletionGuard->setResultAndCancelRemainingWork_inlock(lock, status);
@@ -1080,7 +1079,7 @@ void InitialSyncer::_lastOplogEntryFetcherCallbackForStopTimestamp(
         }
         const bool orderedCommit = true;
         _storage->oplogDiskLocRegister(
-            opCtx.get(), std::get<0>(resultOpTimeAndWallTime).getTimestamp(), orderedCommit);
+            opCtx.get(), resultOpTimeAndWallTime.opTime.getTimestamp(), orderedCommit);
     }
 
     stdx::lock_guard<stdx::mutex> lock(_mutex);
@@ -1139,7 +1138,7 @@ void InitialSyncer::_getNextApplierBatchCallback(
         auto numApplied = ops.size();
         MultiApplier::CallbackFn onCompletionFn = [=](const Status& s) {
             return _multiApplierCallback(
-                s, std::make_tuple(lastApplied, lastAppliedWall), numApplied, onCompletionGuard);
+                s, {lastApplied, lastAppliedWall}, numApplied, onCompletionGuard);
         };
 
         _applier = stdx::make_unique<MultiApplier>(
@@ -1159,7 +1158,7 @@ void InitialSyncer::_getNextApplierBatchCallback(
         std::string msg = str::stream()
             << "The oplog fetcher is no longer running and we have applied all the oplog entries "
                "in the oplog buffer. Aborting this initial sync attempt. Last applied: "
-            << std::get<0>(_lastApplied).toString() << ". Last fetched: " << _lastFetched.toString()
+            << _lastApplied.opTime.toString() << ". Last fetched: " << _lastFetched.toString()
             << ". Number of operations applied: " << _initialSyncState->appliedOps;
         log() << msg;
         status = Status(ErrorCodes::RemoteResultsUnavailable, msg);
@@ -1183,7 +1182,7 @@ void InitialSyncer::_getNextApplierBatchCallback(
 }
 
 void InitialSyncer::_multiApplierCallback(const Status& multiApplierStatus,
-                                          std::tuple<OpTime, Date_t> lastApplied,
+                                          OpTimeAndWallTime lastApplied,
                                           std::uint32_t numApplied,
                                           std::shared_ptr<OnCompletionGuard> onCompletionGuard) {
     stdx::lock_guard<stdx::mutex> lock(_mutex);
@@ -1197,7 +1196,7 @@ void InitialSyncer::_multiApplierCallback(const Status& multiApplierStatus,
 
     _initialSyncState->appliedOps += numApplied;
     _lastApplied = lastApplied;
-    const auto lastAppliedOpTime = std::get<0>(_lastApplied);
+    const auto lastAppliedOpTime = _lastApplied.opTime;
     _opts.setMyLastOptime(_lastApplied, ReplicationCoordinator::DataConsistency::Inconsistent);
 
     // Update oplog visibility after applying a batch so that while applying transaction oplog
@@ -1252,7 +1251,7 @@ void InitialSyncer::_lastOplogEntryFetcherCallbackAfterFetchingMissingDocuments(
         onCompletionGuard->setResultAndCancelRemainingWork_inlock(lock, optimeStatus.getStatus());
         return;
     }
-    auto&& optime = std::get<0>(optimeStatus.getValue());
+    auto&& optime = optimeStatus.getValue().opTime;
 
     const auto newOplogEnd = optime.getTimestamp();
     LOG(2) << "Pushing back minValid from " << _initialSyncState->stopTimestamp << " to "
@@ -1301,8 +1300,7 @@ void InitialSyncer::_rollbackCheckerCheckForRollbackCallback(
     onCompletionGuard->setResultAndCancelRemainingWork_inlock(lock, _lastApplied);
 }
 
-void InitialSyncer::_finishInitialSyncAttempt(
-    const StatusWith<std::tuple<OpTime, Date_t>>& lastApplied) {
+void InitialSyncer::_finishInitialSyncAttempt(const StatusWith<OpTimeAndWallTime>& lastApplied) {
     // Since _finishInitialSyncAttempt can be called from any component's callback function or
     // scheduled task, it is possible that we may not be in a TaskExecutor-managed thread when this
     // function is invoked.
@@ -1389,7 +1387,7 @@ void InitialSyncer::_finishInitialSyncAttempt(
     finishCallbackGuard.dismiss();
 }
 
-void InitialSyncer::_finishCallback(StatusWith<std::tuple<OpTime, Date_t>> lastApplied) {
+void InitialSyncer::_finishCallback(StatusWith<OpTimeAndWallTime> lastApplied) {
     // After running callback function, clear '_onCompletion' to release any resources that might be
     // held by this function object.
     // '_onCompletion' must be moved to a temporary copy and destroyed outside the lock in case
@@ -1485,7 +1483,7 @@ void InitialSyncer::_checkApplierProgressAndScheduleGetNextApplierBatch_inlock(
         return;
     }
 
-    if (std::get<0>(_lastApplied).isNull()) {
+    if (_lastApplied.opTime.isNull()) {
         // Check if any ops occurred while cloning or any ops need to be fetched.
         invariant(_initialSyncState->beginFetchingTimestamp < _initialSyncState->stopTimestamp);
         log() << "Writing to the oplog and applying operations until "
@@ -1494,9 +1492,9 @@ void InitialSyncer::_checkApplierProgressAndScheduleGetNextApplierBatch_inlock(
               << _initialSyncState->beginFetchingTimestamp.toBSON() << " and applying at "
               << _initialSyncState->beginApplyingTimestamp.toBSON() << ")";
         // Fall through to scheduling _getNextApplierBatchCallback().
-    } else if (std::get<0>(_lastApplied).getTimestamp() >= _initialSyncState->stopTimestamp) {
+    } else if (_lastApplied.opTime.getTimestamp() >= _initialSyncState->stopTimestamp) {
         // Check for rollback if we have applied far enough to be consistent.
-        invariant(!std::get<0>(_lastApplied).getTimestamp().isNull());
+        invariant(!_lastApplied.opTime.getTimestamp().isNull());
         _scheduleRollbackCheckerCheckForRollback_inlock(lock, onCompletionGuard);
         return;
     }
diff --git a/src/mongo/db/repl/initial_syncer.h b/src/mongo/db/repl/initial_syncer.h
index d9c13ec9635..658db40d705 100644
--- a/src/mongo/db/repl/initial_syncer.h
+++ b/src/mongo/db/repl/initial_syncer.h
@@ -145,13 +145,12 @@ public:
     /**
      * Callback function to report last applied optime of initial sync.
      */
-    typedef stdx::function<void(const StatusWith<std::tuple<OpTime, Date_t>>& lastApplied)>
-        OnCompletionFn;
+    typedef stdx::function<void(const StatusWith<OpTimeAndWallTime>& lastApplied)> OnCompletionFn;
 
     /**
      * Callback completion guard for initial syncer.
      */
-    using OnCompletionGuard = CallbackCompletionGuard<StatusWith<std::tuple<OpTime, Date_t>>>;
+    using OnCompletionGuard = CallbackCompletionGuard<StatusWith<OpTimeAndWallTime>>;
 
     using StartCollectionClonerFn = DatabaseCloner::StartCollectionClonerFn;
 
@@ -371,7 +370,7 @@ private:
      * Tears down internal state before reporting final status to caller.
      */
     void _tearDown_inlock(OperationContext* opCtx,
-                          const StatusWith<std::tuple<OpTime, Date_t>>& lastApplied);
+                          const StatusWith<OpTimeAndWallTime>& lastApplied);
 
     /**
      * Callback to start a single initial sync attempt.
@@ -472,7 +471,7 @@ private:
      * Callback for MultiApplier completion.
      */
     void _multiApplierCallback(const Status& status,
-                               std::tuple<OpTime, Date_t> lastApplied,
+                               OpTimeAndWallTime lastApplied,
                                std::uint32_t numApplied,
                                std::shared_ptr<OnCompletionGuard> onCompletionGuard);
 
@@ -498,12 +497,12 @@ private:
      * Reports result of current initial sync attempt. May schedule another initial sync attempt
      * depending on shutdown state and whether we've exhausted all initial sync retries.
      */
-    void _finishInitialSyncAttempt(const StatusWith<std::tuple<OpTime, Date_t>>& lastApplied);
+    void _finishInitialSyncAttempt(const StatusWith<OpTimeAndWallTime>& lastApplied);
 
     /**
      * Invokes completion callback and transitions state to State::kComplete.
      */
-    void _finishCallback(StatusWith<std::tuple<OpTime, Date_t>> lastApplied);
+    void _finishCallback(StatusWith<OpTimeAndWallTime> lastApplied);
 
     // Obtains a valid sync source from the sync source selector.
     // Returns error if a sync source cannot be found.
@@ -650,7 +649,7 @@ private:
     std::unique_ptr<MultiApplier> _applier;               // (M)
     HostAndPort _syncSource;                              // (M)
     OpTime _lastFetched;                                  // (MX)
-    std::tuple<OpTime, Date_t> _lastApplied;              // (MX)
+    OpTimeAndWallTime _lastApplied;                       // (MX)
     std::unique_ptr<OplogBuffer> _oplogBuffer;            // (M)
     std::unique_ptr<OplogApplier::Observer> _observer;    // (S)
     std::unique_ptr<OplogApplier> _oplogApplier;          // (M)
diff --git a/src/mongo/db/repl/initial_syncer_test.cpp b/src/mongo/db/repl/initial_syncer_test.cpp
index 68373b8a0d5..a8ed2079d4d 100644
--- a/src/mongo/db/repl/initial_syncer_test.cpp
+++ b/src/mongo/db/repl/initial_syncer_test.cpp
@@ -128,8 +128,8 @@ public:
     void reset() {
         _setMyLastOptime = [this](const OpTimeAndWallTime& opTimeAndWallTime,
                                   ReplicationCoordinator::DataConsistency consistency) {
-            _myLastOpTime = std::get<0>(opTimeAndWallTime);
-            _myLastWallTime = std::get<1>(opTimeAndWallTime);
+            _myLastOpTime = opTimeAndWallTime.opTime;
+            _myLastWallTime = opTimeAndWallTime.wallTime;
         };
         _myLastOpTime = OpTime();
         _myLastWallTime = Date_t::min();
@@ -769,7 +769,7 @@ TEST_F(InitialSyncerTest, InitialSyncerReturnsCallbackCanceledIfShutdownImmediat
 
     initialSyncer->join();
 
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -829,7 +829,7 @@ TEST_F(
 
     initialSyncer->join();
 
-    ASSERT_EQUALS(ErrorCodes::InitialSyncOplogSourceMissing, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::InitialSyncOplogSourceMissing, _lastApplied);
 }
 
 // Confirms that InitialSyncer keeps retrying initial sync.
@@ -853,7 +853,7 @@ TEST_F(InitialSyncerTest,
 
     initialSyncer->join();
 
-    ASSERT_EQUALS(ErrorCodes::InitialSyncOplogSourceMissing, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::InitialSyncOplogSourceMissing, _lastApplied);
 
     // Check number of failed attempts in stats.
     auto progress = initialSyncer->getInitialSyncProgress();
@@ -874,7 +874,7 @@ TEST_F(InitialSyncerTest, InitialSyncerResetsOptimesOnNewAttempt) {
     // Set the last optime to an arbitrary nonzero value. The value of the 'consistency' argument
     // doesn't matter. Also set last wall time to an arbitrary non-minimum value.
     auto origOptime = OpTime(Timestamp(1000, 1), 1);
-    _setMyLastOptime(std::make_tuple(origOptime, Date_t::max()),
+    _setMyLastOptime({origOptime, Date_t::max()},
                      ReplicationCoordinator::DataConsistency::Inconsistent);
 
     // Start initial sync.
@@ -916,7 +916,7 @@ TEST_F(InitialSyncerTest,
 
     initialSyncer->join();
 
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -930,7 +930,7 @@ TEST_F(InitialSyncerTest,
 
     initialSyncer->join();
 
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -957,7 +957,7 @@ TEST_F(InitialSyncerTest,
     initialSyncer->join();
 
     ASSERT_EQUALS(InitialSyncer::State::kComplete, initialSyncer->getState_forTest());
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 // This test verifies that the initial syncer will still transition to a complete state even if
@@ -977,7 +977,7 @@ TEST_F(InitialSyncerTest, InitialSyncerTransitionsToCompleteWhenFinishCallbackTh
     ASSERT_OK(initialSyncer->shutdown());
     initialSyncer->join();
 
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 class SharedCallbackState {
@@ -1053,7 +1053,7 @@ TEST_F(InitialSyncerTest, InitialSyncerTruncatesOplogAndDropsReplicatedDatabases
     ASSERT_OK(initialSyncer->startup(opCtx.get(), maxAttempts));
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 
     LockGuard lock(_storageInterfaceWorkDoneMutex);
     ASSERT_TRUE(_storageInterfaceWorkDone.truncateCalled);
@@ -1078,7 +1078,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughGetRollbackIdScheduleError)
     ASSERT_OK(initialSyncer->startup(opCtx.get(), maxAttempts));
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 
     ASSERT_EQUALS("admin", request.dbname);
     assertRemoteCommandNameEquals("replSetGetRBID", request);
@@ -1106,7 +1106,7 @@ TEST_F(
     ASSERT_OK(initialSyncer->startup(opCtx.get(), maxAttempts));
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::ShutdownInProgress, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::ShutdownInProgress, _lastApplied);
 
     LockGuard lock(_storageInterfaceWorkDoneMutex);
     ASSERT_TRUE(_storageInterfaceWorkDone.truncateCalled);
@@ -1145,7 +1145,7 @@ TEST_F(InitialSyncerTest, InitialSyncerCancelsRollbackCheckerOnShutdown) {
     initialSyncer->join();
     ASSERT_EQUALS(InitialSyncer::State::kComplete, initialSyncer->getState_forTest());
 
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughRollbackCheckerCallbackError) {
@@ -1166,7 +1166,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughRollbackCheckerCallbackError
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughGetBeginFetchingTimestampScheduleError) {
@@ -1197,7 +1197,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughGetBeginFetchingTimestampSch
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 
     ASSERT_EQUALS(syncSource, request.target);
     ASSERT_EQUALS(NamespaceString::kAdminDb, request.dbname);
@@ -1227,7 +1227,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughGetBeginFetchingTimestampCal
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughLastOplogEntryFetcherScheduleError) {
@@ -1262,7 +1262,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughLastOplogEntryFetcherSchedul
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 
     ASSERT_EQUALS(syncSource, request.target);
     ASSERT_EQUALS(_options.localOplogNS.db(), request.dbname);
@@ -1299,7 +1299,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughLastOplogEntryFetcherCallbac
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerCancelsLastOplogEntryFetcherOnShutdown) {
@@ -1329,7 +1329,7 @@ TEST_F(InitialSyncerTest, InitialSyncerCancelsLastOplogEntryFetcherOnShutdown) {
     executor::NetworkInterfaceMock::InNetworkGuard(net)->runReadyNetworkOperations();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -1358,7 +1358,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::NoMatchingDocument, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::NoMatchingDocument, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -1419,7 +1419,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::NoSuchKey, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::NoSuchKey, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -1453,7 +1453,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughFCVFetcherScheduleError) {
@@ -1492,7 +1492,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughFCVFetcherScheduleError) {
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 
     ASSERT_EQUALS(syncSource, request.target);
     assertFCVRequest(request);
@@ -1530,7 +1530,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughFCVFetcherCallbackError) {
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerCancelsFCVFetcherOnShutdown) {
@@ -1563,7 +1563,7 @@ TEST_F(InitialSyncerTest, InitialSyncerCancelsFCVFetcherOnShutdown) {
     executor::NetworkInterfaceMock::InNetworkGuard(net)->runReadyNetworkOperations();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerResendsFindCommandIfFCVFetcherReturnsRetriableError) {
@@ -1628,7 +1628,7 @@ void InitialSyncerTest::runInitialSyncWithBadFCVResponse(std::vector<BSONObj> do
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(expectedError, _lastApplied.getStatus());
+    ASSERT_EQUALS(expectedError, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -1704,7 +1704,7 @@ TEST_F(InitialSyncerTest, InitialSyncerSucceedsWhenFCVFetcherReturnsOldVersion)
     executor::NetworkInterfaceMock::InNetworkGuard(net)->runReadyNetworkOperations();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughOplogFetcherScheduleError) {
@@ -1753,7 +1753,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughOplogFetcherScheduleError) {
         net->runReadyNetworkOperations();
     }
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 
     ASSERT_EQUALS(syncSource, request.target);
     ASSERT_EQUALS(_options.localOplogNS.db(), request.dbname);
@@ -1808,7 +1808,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughOplogFetcherCallbackError) {
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -1868,8 +1868,8 @@ TEST_F(InitialSyncerTest,
     initialSyncer->join();
     ASSERT_OK(_lastApplied.getStatus());
     auto dummyEntry = makeOplogEntry(1);
-    ASSERT_EQUALS(dummyEntry.getOpTime(), std::get<0>(_lastApplied.getValue()));
-    ASSERT_EQUALS(dummyEntry.getWallClockTime().get(), std::get<1>(_lastApplied.getValue()));
+    ASSERT_EQUALS(dummyEntry.getOpTime(), _lastApplied.getValue().opTime);
+    ASSERT_EQUALS(dummyEntry.getWallClockTime().get(), _lastApplied.getValue().wallTime);
 }
 
 TEST_F(
@@ -1928,8 +1928,8 @@ TEST_F(
     initialSyncer->join();
     ASSERT_OK(_lastApplied.getStatus());
     auto dummyEntry = makeOplogEntry(3);
-    ASSERT_EQUALS(dummyEntry.getOpTime(), std::get<0>(_lastApplied.getValue()));
-    ASSERT_EQUALS(dummyEntry.getWallClockTime().get(), std::get<1>(_lastApplied.getValue()));
+    ASSERT_EQUALS(dummyEntry.getOpTime(), _lastApplied.getValue().opTime);
+    ASSERT_EQUALS(dummyEntry.getWallClockTime().get(), _lastApplied.getValue().wallTime);
 }
 
 TEST_F(
@@ -1983,7 +1983,7 @@ TEST_F(
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::RemoteResultsUnavailable, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::RemoteResultsUnavailable, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -2036,7 +2036,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 
     ASSERT_EQUALS(syncSource, request.target);
     ASSERT_EQUALS("admin", request.dbname);
@@ -2083,7 +2083,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::FailedToParse, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::FailedToParse, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerIgnoresLocalDatabasesWhenCloningDatabases) {
@@ -2150,7 +2150,7 @@ TEST_F(InitialSyncerTest, InitialSyncerIgnoresLocalDatabasesWhenCloningDatabases
     getExecutor().shutdown();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -2225,7 +2225,7 @@ TEST_F(InitialSyncerTest,
     getExecutor().shutdown();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerCancelsBothOplogFetcherAndDatabasesClonerOnShutdown) {
@@ -2259,7 +2259,7 @@ TEST_F(InitialSyncerTest, InitialSyncerCancelsBothOplogFetcherAndDatabasesCloner
     executor::NetworkInterfaceMock::InNetworkGuard(net)->runReadyNetworkOperations();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -2322,7 +2322,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -2382,7 +2382,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -2437,7 +2437,7 @@ TEST_F(InitialSyncerTest,
     executor::NetworkInterfaceMock::InNetworkGuard(net)->runReadyNetworkOperations();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -2501,7 +2501,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(
@@ -2561,7 +2561,7 @@ TEST_F(
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::TypeMismatch, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::TypeMismatch, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -2615,7 +2615,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OplogOutOfOrder, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OplogOutOfOrder, _lastApplied);
 }
 
 TEST_F(
@@ -2686,7 +2686,7 @@ TEST_F(
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
     ASSERT_EQUALS(_options.localOplogNS, insertDocumentNss);
     ASSERT_BSONOBJ_EQ(oplogEntry, insertDocumentDoc.obj);
 }
@@ -2760,7 +2760,7 @@ TEST_F(
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
     ASSERT_EQUALS(_options.localOplogNS, insertDocumentNss);
     ASSERT_BSONOBJ_EQ(oplogEntry, insertDocumentDoc.obj);
 }
@@ -2834,7 +2834,7 @@ TEST_F(
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(
@@ -2897,7 +2897,7 @@ TEST_F(
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerCancelsLastRollbackCheckerOnShutdown) {
@@ -2959,7 +2959,7 @@ TEST_F(InitialSyncerTest, InitialSyncerCancelsLastRollbackCheckerOnShutdown) {
     executor::NetworkInterfaceMock::InNetworkGuard(net)->runReadyNetworkOperations();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerCancelsLastRollbackCheckerOnOplogFetcherCallbackError) {
@@ -3024,7 +3024,7 @@ TEST_F(InitialSyncerTest, InitialSyncerCancelsLastRollbackCheckerOnOplogFetcherC
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest,
@@ -3081,7 +3081,7 @@ TEST_F(InitialSyncerTest,
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::UnrecoverableRollbackError, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::UnrecoverableRollbackError, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, LastOpTimeShouldBeSetEvenIfNoOperationsAreAppliedAfterCloning) {
@@ -3173,8 +3173,8 @@ TEST_F(InitialSyncerTest, LastOpTimeShouldBeSetEvenIfNoOperationsAreAppliedAfter
 
     initialSyncer->join();
     ASSERT_OK(_lastApplied.getStatus());
-    ASSERT_EQUALS(oplogEntry.getOpTime(), std::get<0>(_lastApplied.getValue()));
-    ASSERT_EQUALS(oplogEntry.getWallClockTime().get(), std::get<1>(_lastApplied.getValue()));
+    ASSERT_EQUALS(oplogEntry.getOpTime(), _lastApplied.getValue().opTime);
+    ASSERT_EQUALS(oplogEntry.getWallClockTime().get(), _lastApplied.getValue().wallTime);
     ASSERT_FALSE(_replicationProcess->getConsistencyMarkers()->getInitialSyncFlag(opCtx.get()));
 }
 
@@ -3237,7 +3237,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughGetNextApplierBatchScheduleE
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughSecondGetNextApplierBatchScheduleError) {
@@ -3299,7 +3299,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughSecondGetNextApplierBatchSch
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerCancelsGetNextApplierBatchOnShutdown) {
@@ -3357,7 +3357,7 @@ TEST_F(InitialSyncerTest, InitialSyncerCancelsGetNextApplierBatchOnShutdown) {
     executor::NetworkInterfaceMock::InNetworkGuard(net)->runReadyNetworkOperations();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughGetNextApplierBatchInLockError) {
@@ -3421,7 +3421,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughGetNextApplierBatchInLockErr
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::BadValue, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::BadValue, _lastApplied);
 }
 
 TEST_F(
@@ -3498,7 +3498,7 @@ TEST_F(
     executor::NetworkInterfaceMock::InNetworkGuard(net)->runReadyNetworkOperations();
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::CallbackCanceled, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughMultiApplierScheduleError) {
@@ -3575,7 +3575,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughMultiApplierScheduleError) {
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerPassesThroughMultiApplierCallbackError) {
@@ -3633,7 +3633,7 @@ TEST_F(InitialSyncerTest, InitialSyncerPassesThroughMultiApplierCallbackError) {
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerCancelsGetNextApplierBatchCallbackOnOplogFetcherError) {
@@ -3691,7 +3691,7 @@ TEST_F(InitialSyncerTest, InitialSyncerCancelsGetNextApplierBatchCallbackOnOplog
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OperationFailed, _lastApplied);
 }
 
 OplogEntry InitialSyncerTest::doInitialSyncWithOneBatch(bool shouldSetFCV) {
@@ -3771,8 +3771,8 @@ void InitialSyncerTest::doSuccessfulInitialSyncWithOneBatch(bool shouldSetFCV) {
     auto lastOp = doInitialSyncWithOneBatch(shouldSetFCV);
     serverGlobalParams.featureCompatibility.reset();
     ASSERT_OK(_lastApplied.getStatus());
-    ASSERT_EQUALS(lastOp.getOpTime(), std::get<0>(_lastApplied.getValue()));
-    ASSERT_EQUALS(lastOp.getWallClockTime().get(), std::get<1>(_lastApplied.getValue()));
+    ASSERT_EQUALS(lastOp.getOpTime(), _lastApplied.getValue().opTime);
+    ASSERT_EQUALS(lastOp.getWallClockTime().get(), _lastApplied.getValue().wallTime);
 
     ASSERT_EQUALS(lastOp.getOpTime().getTimestamp(), _storageInterface->getInitialDataTimestamp());
 }
@@ -3890,8 +3890,8 @@ TEST_F(InitialSyncerTest,
 
     initialSyncer->join();
     ASSERT_OK(_lastApplied.getStatus());
-    ASSERT_EQUALS(lastOp.getOpTime(), std::get<0>(_lastApplied.getValue()));
-    ASSERT_EQUALS(lastOp.getWallClockTime().get(), std::get<1>(_lastApplied.getValue()));
+    ASSERT_EQUALS(lastOp.getOpTime(), _lastApplied.getValue().opTime);
+    ASSERT_EQUALS(lastOp.getWallClockTime().get(), _lastApplied.getValue().wallTime);
 }
 
 TEST_F(
@@ -3986,8 +3986,8 @@ TEST_F(
 
     initialSyncer->join();
     ASSERT_OK(_lastApplied.getStatus());
-    ASSERT_EQUALS(lastOp.getOpTime(), std::get<0>(_lastApplied.getValue()));
-    ASSERT_EQUALS(lastOp.getWallClockTime().get(), std::get<1>(_lastApplied.getValue()));
+    ASSERT_EQUALS(lastOp.getOpTime(), _lastApplied.getValue().opTime);
+    ASSERT_EQUALS(lastOp.getWallClockTime().get(), _lastApplied.getValue().wallTime);
 
     ASSERT_TRUE(fetchCountIncremented);
 
@@ -4010,7 +4010,7 @@ TEST_F(InitialSyncerTest,
     ASSERT_OK(initialSyncer->startup(opCtx.get(), maxAttempts));
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::InvalidSyncSource, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::InvalidSyncSource, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, OplogOutOfOrderOnOplogFetchFinish) {
@@ -4067,7 +4067,7 @@ TEST_F(InitialSyncerTest, OplogOutOfOrderOnOplogFetchFinish) {
     }
 
     initialSyncer->join();
-    ASSERT_EQUALS(ErrorCodes::OplogOutOfOrder, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::OplogOutOfOrder, _lastApplied);
 }
 
 TEST_F(InitialSyncerTest, GetInitialSyncProgressReturnsCorrectProgress) {
@@ -4308,8 +4308,8 @@ TEST_F(InitialSyncerTest, GetInitialSyncProgressReturnsCorrectProgress) {
     initialSyncer->join();
     ASSERT_OK(_lastApplied.getStatus());
     auto dummyEntry = makeOplogEntry(7);
-    ASSERT_EQUALS(dummyEntry.getOpTime(), std::get<0>(_lastApplied.getValue()));
-    ASSERT_EQUALS(dummyEntry.getWallClockTime().get(), std::get<1>(_lastApplied.getValue()));
+    ASSERT_EQUALS(dummyEntry.getOpTime(), _lastApplied.getValue().opTime);
+    ASSERT_EQUALS(dummyEntry.getWallClockTime().get(), _lastApplied.getValue().wallTime);
 
     progress = initialSyncer->getInitialSyncProgress();
     log() << "Progress at end: " << progress;
@@ -4436,7 +4436,7 @@ TEST_F(InitialSyncerTest, InitialSyncerUpgradeNonReplicatedUniqueIndexesError) {
     doInitialSyncWithOneBatch(true);
 
     // Ensure the upgradeNonReplicatedUniqueIndexes status was captured.
-    ASSERT_EQUALS(ErrorCodes::NamespaceNotFound, _lastApplied.getStatus());
+    ASSERT_EQUALS(ErrorCodes::NamespaceNotFound, _lastApplied);
 }
 
 }  // namespace
diff --git a/src/mongo/db/repl/member_data.cpp b/src/mongo/db/repl/member_data.cpp
index bed402172f3..18cb910496e 100644
--- a/src/mongo/db/repl/member_data.cpp
+++ b/src/mongo/db/repl/member_data.cpp
@@ -125,40 +125,39 @@ void MemberData::setAuthIssue(Date_t now) {
 void MemberData::setLastAppliedOpTimeAndWallTime(OpTimeAndWallTime opTime, Date_t now) {
     _lastUpdate = now;
     _lastUpdateStale = false;
-    _lastAppliedOpTime = std::get<0>(opTime);
-    _lastAppliedWallTime = std::get<1>(opTime);
+    _lastAppliedOpTime = opTime.opTime;
+    _lastAppliedWallTime = opTime.wallTime;
 }
 
 void MemberData::setLastAppliedOpTime(OpTime opTime, Date_t now) {
-    setLastAppliedOpTimeAndWallTime(std::make_tuple(opTime, Date_t::min()), now);
+    setLastAppliedOpTimeAndWallTime({opTime, Date_t::min()}, now);
 }
 
 void MemberData::setLastDurableOpTimeAndWallTime(OpTimeAndWallTime opTime, Date_t now) {
     _lastUpdate = now;
     _lastUpdateStale = false;
-    if (_lastAppliedOpTime < std::get<0>(opTime)) {
+    if (_lastAppliedOpTime < opTime.opTime) {
         // TODO(russotto): We think this should never happen, rollback or no rollback.  Make this an
         // invariant and see what happens.
-        log() << "Durable progress (" << std::get<0>(opTime)
-              << ") is ahead of the applied progress (" << _lastAppliedOpTime
-              << ". This is likely due to a "
-                 "rollback."
+        log() << "Durable progress (" << opTime.opTime << ") is ahead of the applied progress ("
+              << _lastAppliedOpTime << ". This is likely due to a "
+                                       "rollback."
               << " memberid: " << _memberId << _hostAndPort.toString()
               << " previous durable progress: " << _lastDurableOpTime;
     } else {
-        _lastDurableOpTime = std::get<0>(opTime);
-        _lastDurableWallTime = std::get<1>(opTime);
+        _lastDurableOpTime = opTime.opTime;
+        _lastDurableWallTime = opTime.wallTime;
     }
 }
 
 void MemberData::setLastDurableOpTime(OpTime opTime, Date_t now) {
-    setLastDurableOpTimeAndWallTime(std::make_tuple(opTime, Date_t::min()), now);
+    setLastDurableOpTimeAndWallTime({opTime, Date_t::min()}, now);
 }
 
 bool MemberData::advanceLastAppliedOpTimeAndWallTime(OpTimeAndWallTime opTime, Date_t now) {
     _lastUpdate = now;
     _lastUpdateStale = false;
-    if (_lastAppliedOpTime < std::get<0>(opTime)) {
+    if (_lastAppliedOpTime < opTime.opTime) {
         setLastAppliedOpTimeAndWallTime(opTime, now);
         return true;
     }
@@ -166,22 +165,22 @@ bool MemberData::advanceLastAppliedOpTimeAndWallTime(OpTimeAndWallTime opTime, D
 }
 
 bool MemberData::advanceLastAppliedOpTime(OpTime opTime, Date_t now) {
-    return advanceLastAppliedOpTimeAndWallTime(std::make_tuple(opTime, Date_t::min()), now);
+    return advanceLastAppliedOpTimeAndWallTime({opTime, Date_t::min()}, now);
 }
 
 bool MemberData::advanceLastDurableOpTimeAndWallTime(OpTimeAndWallTime opTime, Date_t now) {
     _lastUpdate = now;
     _lastUpdateStale = false;
-    if (_lastDurableOpTime < std::get<0>(opTime)) {
-        _lastDurableOpTime = std::get<0>(opTime);
-        _lastDurableWallTime = std::get<1>(opTime);
+    if (_lastDurableOpTime < opTime.opTime) {
+        _lastDurableOpTime = opTime.opTime;
+        _lastDurableWallTime = opTime.wallTime;
         return true;
     }
     return false;
 }
 
 bool MemberData::advanceLastDurableOpTime(OpTime opTime, Date_t now) {
-    return advanceLastDurableOpTimeAndWallTime(std::make_tuple(opTime, Date_t::min()), now);
+    return advanceLastDurableOpTimeAndWallTime({opTime, Date_t::min()}, now);
 }
 
 }  // namespace repl
diff --git a/src/mongo/db/repl/member_data.h b/src/mongo/db/repl/member_data.h
index cc65df0c309..cae0e30b4c9 100644
--- a/src/mongo/db/repl/member_data.h
+++ b/src/mongo/db/repl/member_data.h
@@ -37,8 +37,6 @@
 namespace mongo {
 namespace repl {
 
-using OpTimeAndWallTime = std::tuple<OpTime, Date_t>;
-
 /**
  * This class contains the data from heartbeat responses and replSetUpdatePosition commands for one
  * member of a replica set.
diff --git a/src/mongo/db/repl/oplog.cpp b/src/mongo/db/repl/oplog.cpp
index 7e6d5e08800..7b9df3d6add 100644
--- a/src/mongo/db/repl/oplog.cpp
+++ b/src/mongo/db/repl/oplog.cpp
@@ -551,8 +551,7 @@ void _logOpsInner(OperationContext* opCtx,
 
             // Optimes on the primary should always represent consistent database states.
             replCoord->setMyLastAppliedOpTimeAndWallTimeForward(
-                std::make_tuple(finalOpTime, wallTime),
-                ReplicationCoordinator::DataConsistency::Consistent);
+                {finalOpTime, wallTime}, ReplicationCoordinator::DataConsistency::Consistent);
 
             // We set the last op on the client to 'finalOpTime', because that contains the
             // timestamp of the operation that the client actually performed.
diff --git a/src/mongo/db/repl/optime.cpp b/src/mongo/db/repl/optime.cpp
index b5632a21b02..0c68be9e1a8 100644
--- a/src/mongo/db/repl/optime.cpp
+++ b/src/mongo/db/repl/optime.cpp
@@ -103,6 +103,10 @@ std::ostream& operator<<(std::ostream& out, const OpTime& opTime) {
     return out << opTime.toString();
 }
 
+std::ostream& operator<<(std::ostream& out, const OpTimeAndWallTime& opTime) {
+    return out << opTime.opTime.toString() << ", " << opTime.wallTime.toString();
+}
+
 void OpTime::appendAsQuery(BSONObjBuilder* builder) const {
     builder->append(kTimestampFieldName, _timestamp);
     if (_term == kUninitializedTerm) {
diff --git a/src/mongo/db/repl/optime.h b/src/mongo/db/repl/optime.h
index 675d2854fde..c1b377f2845 100644
--- a/src/mongo/db/repl/optime.h
+++ b/src/mongo/db/repl/optime.h
@@ -159,8 +159,12 @@ private:
     Timestamp _timestamp;
     long long _term = kInitialTerm;
 };
-using OpTimeAndWallTime = std::tuple<OpTime, Date_t>;
 
+struct OpTimeAndWallTime {
+    OpTime opTime;
+    Date_t wallTime;
+};
+std::ostream& operator<<(std::ostream& out, const OpTimeAndWallTime& opTime);
 }  // namespace repl
 
 /**
diff --git a/src/mongo/db/repl/replication_consistency_markers_impl.cpp b/src/mongo/db/repl/replication_consistency_markers_impl.cpp
index cbeec1a1e28..2c98528aa35 100644
--- a/src/mongo/db/repl/replication_consistency_markers_impl.cpp
+++ b/src/mongo/db/repl/replication_consistency_markers_impl.cpp
@@ -145,7 +145,7 @@ void ReplicationConsistencyMarkersImpl::clearInitialSyncFlag(OperationContext* o
 
     auto replCoord = repl::ReplicationCoordinator::get(opCtx);
     OpTimeAndWallTime opTimeAndWallTime = replCoord->getMyLastAppliedOpTimeAndWallTime();
-    const auto time = std::get<0>(opTimeAndWallTime);
+    const auto time = opTimeAndWallTime.opTime;
     TimestampedBSONObj update;
     update.obj = BSON("$unset" << kInitialSyncFlag << "$set"
                                << BSON(MinValidDocument::kMinValidTimestampFieldName
diff --git a/src/mongo/db/repl/replication_coordinator.h b/src/mongo/db/repl/replication_coordinator.h
index 69a96ce5932..6b63d156b17 100644
--- a/src/mongo/db/repl/replication_coordinator.h
+++ b/src/mongo/db/repl/replication_coordinator.h
@@ -66,11 +66,11 @@ class ReplSetMetadata;
 }  // namespace rpc
 
 namespace repl {
-using OpTimeAndWallTime = std::tuple<OpTime, Date_t>;
 
 class BackgroundSync;
 class IsMasterResponse;
 class OpTime;
+struct OpTimeAndWallTime;
 class ReadConcernArgs;
 class ReplSetConfig;
 class ReplSetHeartbeatArgsV1;
diff --git a/src/mongo/db/repl/replication_coordinator_external_state.h b/src/mongo/db/repl/replication_coordinator_external_state.h
index 91d5a0bc81a..a7bb4c6bdd0 100644
--- a/src/mongo/db/repl/replication_coordinator_external_state.h
+++ b/src/mongo/db/repl/replication_coordinator_external_state.h
@@ -188,8 +188,7 @@ public:
      * Gets the last optime, and corresponding wall clock time, of an operation performed on this
      * host, from stable storage.
      */
-    virtual StatusWith<std::tuple<OpTime, Date_t>> loadLastOpTimeAndWallTime(
-        OperationContext* opCtx) = 0;
+    virtual StatusWith<OpTimeAndWallTime> loadLastOpTimeAndWallTime(OperationContext* opCtx) = 0;
 
     /**
      * Returns the HostAndPort of the remote client connected to us that initiated the operation
diff --git a/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp b/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp
index 7b57c2f74dd..2811ec062ca 100644
--- a/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp
+++ b/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp
@@ -372,7 +372,7 @@ void ReplicationCoordinatorExternalStateImpl::shutdown(OperationContext* opCtx)
     auto loadLastOpTimeAndWallTimeResult = loadLastOpTimeAndWallTime(opCtx);
     if (_replicationProcess->getConsistencyMarkers()->getOplogTruncateAfterPoint(opCtx).isNull() &&
         loadLastOpTimeAndWallTimeResult.isOK() &&
-        std::get<0>(loadLastOpTimeAndWallTimeResult.getValue()) ==
+        loadLastOpTimeAndWallTimeResult.getValue().opTime ==
             _replicationProcess->getConsistencyMarkers()->getAppliedThrough(opCtx)) {
         // Clear the appliedThrough marker to indicate we are consistent with the top of the
         // oplog. We record this update at the 'lastAppliedOpTime'. If there are any outstanding
@@ -485,7 +485,7 @@ OpTime ReplicationCoordinatorExternalStateImpl::onTransitionToPrimary(OperationC
     });
     const auto loadLastOpTimeAndWallTimeResult = loadLastOpTimeAndWallTime(opCtx);
     fassert(28665, loadLastOpTimeAndWallTimeResult);
-    auto opTimeToReturn = std::get<0>(loadLastOpTimeAndWallTimeResult.getValue());
+    auto opTimeToReturn = loadLastOpTimeAndWallTimeResult.getValue().opTime;
 
 
     _shardingOnTransitionToPrimaryHook(opCtx);
@@ -627,8 +627,8 @@ bool ReplicationCoordinatorExternalStateImpl::oplogExists(OperationContext* opCt
     return oplog.getCollection() != nullptr;
 }
 
-StatusWith<std::tuple<OpTime, Date_t>>
-ReplicationCoordinatorExternalStateImpl::loadLastOpTimeAndWallTime(OperationContext* opCtx) {
+StatusWith<OpTimeAndWallTime> ReplicationCoordinatorExternalStateImpl::loadLastOpTimeAndWallTime(
+    OperationContext* opCtx) {
     // TODO: handle WriteConflictExceptions below
     try {
         // If we are doing an initial sync do not read from the oplog.
@@ -643,14 +643,14 @@ ReplicationCoordinatorExternalStateImpl::loadLastOpTimeAndWallTime(OperationCont
                     return Helpers::getLast(
                         opCtx, NamespaceString::kRsOplogNamespace.ns().c_str(), oplogEntry);
                 })) {
-            return StatusWith<std::tuple<OpTime, Date_t>>(
-                ErrorCodes::NoMatchingDocument,
-                str::stream() << "Did not find any entries in "
-                              << NamespaceString::kRsOplogNamespace.ns());
+            return StatusWith<OpTimeAndWallTime>(ErrorCodes::NoMatchingDocument,
+                                                 str::stream()
+                                                     << "Did not find any entries in "
+                                                     << NamespaceString::kRsOplogNamespace.ns());
         }
         BSONElement tsElement = oplogEntry[tsFieldName];
         if (tsElement.eoo()) {
-            return StatusWith<std::tuple<OpTime, Date_t>>(
+            return StatusWith<OpTimeAndWallTime>(
                 ErrorCodes::NoSuchKey,
                 str::stream() << "Most recent entry in " << NamespaceString::kRsOplogNamespace.ns()
                               << " missing \""
@@ -658,7 +658,7 @@ ReplicationCoordinatorExternalStateImpl::loadLastOpTimeAndWallTime(OperationCont
                               << "\" field");
         }
         if (tsElement.type() != bsonTimestamp) {
-            return StatusWith<std::tuple<OpTime, Date_t>>(
+            return StatusWith<OpTimeAndWallTime>(
                 ErrorCodes::TypeMismatch,
                 str::stream() << "Expected type of \"" << tsFieldName << "\" in most recent "
                               << NamespaceString::kRsOplogNamespace.ns()
@@ -674,9 +674,10 @@ ReplicationCoordinatorExternalStateImpl::loadLastOpTimeAndWallTime(OperationCont
         if (!wallTimeStatus.isOK()) {
             return wallTimeStatus.getStatus();
         }
-        return std::make_tuple(opTimeStatus.getValue(), wallTimeStatus.getValue());
+        OpTimeAndWallTime parseResult = {opTimeStatus.getValue(), wallTimeStatus.getValue()};
+        return parseResult;
     } catch (const DBException& ex) {
-        return StatusWith<std::tuple<OpTime, Date_t>>(ex.toStatus());
+        return StatusWith<OpTimeAndWallTime>(ex.toStatus());
     }
 }
 
diff --git a/src/mongo/db/repl/replication_coordinator_external_state_impl.h b/src/mongo/db/repl/replication_coordinator_external_state_impl.h
index 5ba0c5aa57e..fb6ea07d80f 100644
--- a/src/mongo/db/repl/replication_coordinator_external_state_impl.h
+++ b/src/mongo/db/repl/replication_coordinator_external_state_impl.h
@@ -89,8 +89,7 @@ public:
     virtual void setGlobalTimestamp(ServiceContext* service, const Timestamp& newTime);
     virtual Timestamp getGlobalTimestamp(ServiceContext* service);
     bool oplogExists(OperationContext* opCtx) final;
-    virtual StatusWith<std::tuple<OpTime, Date_t>> loadLastOpTimeAndWallTime(
-        OperationContext* opCtx);
+    virtual StatusWith<OpTimeAndWallTime> loadLastOpTimeAndWallTime(OperationContext* opCtx);
     virtual HostAndPort getClientHostAndPort(const OperationContext* opCtx);
     virtual void closeConnections();
     virtual void shardingOnStepDownHook();
diff --git a/src/mongo/db/repl/replication_coordinator_external_state_mock.cpp b/src/mongo/db/repl/replication_coordinator_external_state_mock.cpp
index 3f2cbb67a35..b73312fcd06 100644
--- a/src/mongo/db/repl/replication_coordinator_external_state_mock.cpp
+++ b/src/mongo/db/repl/replication_coordinator_external_state_mock.cpp
@@ -169,11 +169,12 @@ bool ReplicationCoordinatorExternalStateMock::oplogExists(OperationContext* opCt
     return true;
 }
 
-StatusWith<std::tuple<OpTime, Date_t>>
-ReplicationCoordinatorExternalStateMock::loadLastOpTimeAndWallTime(OperationContext* opCtx) {
+StatusWith<OpTimeAndWallTime> ReplicationCoordinatorExternalStateMock::loadLastOpTimeAndWallTime(
+    OperationContext* opCtx) {
     if (_lastOpTime.getStatus().isOK()) {
         if (_lastWallTime.getStatus().isOK()) {
-            return std::make_tuple(_lastOpTime.getValue(), _lastWallTime.getValue());
+            OpTimeAndWallTime result = {_lastOpTime.getValue(), _lastWallTime.getValue()};
+            return result;
         } else {
             return _lastWallTime.getStatus();
         }
diff --git a/src/mongo/db/repl/replication_coordinator_external_state_mock.h b/src/mongo/db/repl/replication_coordinator_external_state_mock.h
index 1a6b2c4a6be..6311dd446b1 100644
--- a/src/mongo/db/repl/replication_coordinator_external_state_mock.h
+++ b/src/mongo/db/repl/replication_coordinator_external_state_mock.h
@@ -79,8 +79,7 @@ public:
     virtual void setGlobalTimestamp(ServiceContext* service, const Timestamp& newTime);
     virtual Timestamp getGlobalTimestamp(ServiceContext* service);
     bool oplogExists(OperationContext* opCtx) override;
-    virtual StatusWith<std::tuple<OpTime, Date_t>> loadLastOpTimeAndWallTime(
-        OperationContext* opCtx);
+    virtual StatusWith<OpTimeAndWallTime> loadLastOpTimeAndWallTime(OperationContext* opCtx);
     virtual void closeConnections();
     virtual void shardingOnStepDownHook();
     virtual void signalApplierToChooseNewSyncSource();
diff --git a/src/mongo/db/repl/replication_coordinator_impl.cpp b/src/mongo/db/repl/replication_coordinator_impl.cpp
index 95e5ac6dc7e..c0a6e03c39e 100644
--- a/src/mongo/db/repl/replication_coordinator_impl.cpp
+++ b/src/mongo/db/repl/replication_coordinator_impl.cpp
@@ -527,7 +527,7 @@ bool ReplicationCoordinatorImpl::_startLoadLocalConfig(OperationContext* opCtx)
 void ReplicationCoordinatorImpl::_finishLoadLocalConfig(
     const executor::TaskExecutor::CallbackArgs& cbData,
     const ReplSetConfig& localConfig,
-    const StatusWith<std::tuple<OpTime, Date_t>>& lastOpTimeAndWallTimeStatus,
+    const StatusWith<OpTimeAndWallTime>& lastOpTimeAndWallTimeStatus,
     const StatusWith<LastVote>& lastVoteStatus) {
     if (!cbData.status.isOK()) {
         LOG(1) << "Loading local replica set configuration failed due to " << cbData.status;
@@ -573,7 +573,7 @@ void ReplicationCoordinatorImpl::_finishLoadLocalConfig(
     // Do not check optime, if this node is an arbiter.
     bool isArbiter =
         myIndex.getValue() != -1 && localConfig.getMemberAt(myIndex.getValue()).isArbiter();
-    OpTimeAndWallTime lastOpTimeAndWallTime = std::make_tuple(OpTime(), Date_t::min());
+    OpTimeAndWallTime lastOpTimeAndWallTime = {OpTime(), Date_t::min()};
     if (!isArbiter) {
         if (!lastOpTimeAndWallTimeStatus.isOK()) {
             warning() << "Failed to load timestamp and/or wall clock time of most recently applied "
@@ -590,7 +590,7 @@ void ReplicationCoordinatorImpl::_finishLoadLocalConfig(
         }
     }
 
-    const auto lastOpTime = std::get<0>(lastOpTimeAndWallTime);
+    const auto lastOpTime = lastOpTimeAndWallTime.opTime;
     // Restore the current term according to the terms of last oplog entry and last vote.
     // The initial term of OpTime() is 0.
     long long term = lastOpTime.getTerm();
@@ -691,45 +691,44 @@ void ReplicationCoordinatorImpl::_startDataReplication(OperationContext* opCtx,
         return;
     }
 
-    auto onCompletion =
-        [this, startCompleted](const StatusWith<std::tuple<OpTime, Date_t>>& opTimeStatus) {
-            {
-                stdx::lock_guard<stdx::mutex> lock(_mutex);
-                if (opTimeStatus == ErrorCodes::CallbackCanceled) {
-                    log() << "Initial Sync has been cancelled: " << opTimeStatus.getStatus();
+    auto onCompletion = [this, startCompleted](const StatusWith<OpTimeAndWallTime>& opTimeStatus) {
+        {
+            stdx::lock_guard<stdx::mutex> lock(_mutex);
+            if (opTimeStatus == ErrorCodes::CallbackCanceled) {
+                log() << "Initial Sync has been cancelled: " << opTimeStatus.getStatus();
+                return;
+            } else if (!opTimeStatus.isOK()) {
+                if (_inShutdown) {
+                    log() << "Initial Sync failed during shutdown due to "
+                          << opTimeStatus.getStatus();
                     return;
-                } else if (!opTimeStatus.isOK()) {
-                    if (_inShutdown) {
-                        log() << "Initial Sync failed during shutdown due to "
-                              << opTimeStatus.getStatus();
-                        return;
-                    } else {
-                        error() << "Initial sync failed, shutting down now. Restart the server "
-                                   "to attempt a new initial sync.";
-                        fassertFailedWithStatusNoTrace(40088, opTimeStatus.getStatus());
-                    }
+                } else {
+                    error() << "Initial sync failed, shutting down now. Restart the server "
+                               "to attempt a new initial sync.";
+                    fassertFailedWithStatusNoTrace(40088, opTimeStatus.getStatus());
                 }
-
-                const auto lastApplied = opTimeStatus.getValue();
-                _setMyLastAppliedOpTimeAndWallTime(
-                    lock, lastApplied, false, DataConsistency::Consistent);
             }
 
-            // Clear maint. mode.
-            while (getMaintenanceMode()) {
-                setMaintenanceMode(false).transitional_ignore();
-            }
+            const auto lastApplied = opTimeStatus.getValue();
+            _setMyLastAppliedOpTimeAndWallTime(
+                lock, lastApplied, false, DataConsistency::Consistent);
+        }
 
-            if (startCompleted) {
-                startCompleted();
-            }
-            // Because initial sync completed, we can only be in STARTUP2, not REMOVED.
-            // Transition from STARTUP2 to RECOVERING and start the producer and the applier.
-            invariant(getMemberState().startup2());
-            invariant(setFollowerMode(MemberState::RS_RECOVERING));
-            auto opCtxHolder = cc().makeOperationContext();
-            _externalState->startSteadyStateReplication(opCtxHolder.get(), this);
-        };
+        // Clear maint. mode.
+        while (getMaintenanceMode()) {
+            setMaintenanceMode(false).transitional_ignore();
+        }
+
+        if (startCompleted) {
+            startCompleted();
+        }
+        // Because initial sync completed, we can only be in STARTUP2, not REMOVED.
+        // Transition from STARTUP2 to RECOVERING and start the producer and the applier.
+        invariant(getMemberState().startup2());
+        invariant(setFollowerMode(MemberState::RS_RECOVERING));
+        auto opCtxHolder = cc().makeOperationContext();
+        _externalState->startSteadyStateReplication(opCtxHolder.get(), this);
+    };
 
     std::shared_ptr<InitialSyncer> initialSyncerCopy;
     try {
@@ -1080,7 +1079,7 @@ void ReplicationCoordinatorImpl::setMyLastAppliedOpTimeAndWallTimeForward(
     const OpTimeAndWallTime& opTimeAndWallTime, DataConsistency consistency) {
     // Update the global timestamp before setting the last applied opTime forward so the last
     // applied optime is never greater than the latest cluster time in the logical clock.
-    const auto opTime = std::get<0>(opTimeAndWallTime);
+    const auto opTime = opTimeAndWallTime.opTime;
     _externalState->setGlobalTimestamp(getServiceContext(), opTime.getTimestamp());
 
     stdx::unique_lock<stdx::mutex> lock(_mutex);
@@ -1110,7 +1109,7 @@ void ReplicationCoordinatorImpl::setMyLastAppliedOpTimeAndWallTimeForward(
 void ReplicationCoordinatorImpl::setMyLastDurableOpTimeAndWallTimeForward(
     const OpTimeAndWallTime& opTimeAndWallTime) {
     stdx::unique_lock<stdx::mutex> lock(_mutex);
-    if (std::get<0>(opTimeAndWallTime) > _getMyLastDurableOpTime_inlock()) {
+    if (opTimeAndWallTime.opTime > _getMyLastDurableOpTime_inlock()) {
         _setMyLastDurableOpTimeAndWallTime(lock, opTimeAndWallTime, false);
         _reportUpstream_inlock(std::move(lock));
     }
@@ -1118,7 +1117,7 @@ void ReplicationCoordinatorImpl::setMyLastDurableOpTimeAndWallTimeForward(
 
 void ReplicationCoordinatorImpl::setMyLastAppliedOpTimeAndWallTime(
     const OpTimeAndWallTime& opTimeAndWallTime) {
-    const auto opTime = std::get<0>(opTimeAndWallTime);
+    const auto opTime = opTimeAndWallTime.opTime;
     // Update the global timestamp before setting the last applied opTime forward so the last
     // applied optime is never greater than the latest cluster time in the logical clock.
     _externalState->setGlobalTimestamp(getServiceContext(), opTime.getTimestamp());
@@ -1146,12 +1145,9 @@ void ReplicationCoordinatorImpl::_resetMyLastOpTimes(WithLock lk) {
     LOG(1) << "resetting durable/applied optimes.";
     // Reset to uninitialized OpTime
     bool isRollbackAllowed = true;
-    _setMyLastAppliedOpTimeAndWallTime(lk,
-                                       std::make_tuple(OpTime(), Date_t::min()),
-                                       isRollbackAllowed,
-                                       DataConsistency::Inconsistent);
-    _setMyLastDurableOpTimeAndWallTime(
-        lk, std::make_tuple(OpTime(), Date_t::min()), isRollbackAllowed);
+    _setMyLastAppliedOpTimeAndWallTime(
+        lk, {OpTime(), Date_t::min()}, isRollbackAllowed, DataConsistency::Inconsistent);
+    _setMyLastDurableOpTimeAndWallTime(lk, {OpTime(), Date_t::min()}, isRollbackAllowed);
     _stableOpTimeCandidates.clear();
 }
 
@@ -1176,7 +1172,7 @@ void ReplicationCoordinatorImpl::_setMyLastAppliedOpTimeAndWallTime(
     const OpTimeAndWallTime& opTimeAndWallTime,
     bool isRollbackAllowed,
     DataConsistency consistency) {
-    const auto opTime = std::get<0>(opTimeAndWallTime);
+    const auto opTime = opTimeAndWallTime.opTime;
 
     // The last applied opTime should never advance beyond the global timestamp (i.e. the latest
     // cluster time). Not enforced if the logical clock is disabled, e.g. for arbiters.
@@ -2696,7 +2692,7 @@ Status ReplicationCoordinatorImpl::processReplSetInitiate(OperationContext* opCt
     // Sets the initial data timestamp on the storage engine so it can assign a timestamp
     // to data on disk. We do this after writing the "initiating set" oplog entry.
     _storage->setInitialDataTimestamp(getServiceContext(),
-                                      std::get<0>(lastAppliedOpTimeAndWallTime).getTimestamp());
+                                      lastAppliedOpTimeAndWallTime.opTime.getTimestamp());
 
     _finishReplSetInitiate(opCtx, newConfig, myIndex.getValue());
 
@@ -3295,7 +3291,7 @@ void ReplicationCoordinatorImpl::blacklistSyncSource(const HostAndPort& host, Da
 void ReplicationCoordinatorImpl::resetLastOpTimesFromOplog(OperationContext* opCtx,
                                                            DataConsistency consistency) {
     auto lastOpTimeAndWallTimeStatus = _externalState->loadLastOpTimeAndWallTime(opCtx);
-    OpTimeAndWallTime lastOpTimeAndWallTime = std::make_tuple(OpTime(), Date_t::min());
+    OpTimeAndWallTime lastOpTimeAndWallTime = {OpTime(), Date_t::min()};
     if (!lastOpTimeAndWallTimeStatus.getStatus().isOK()) {
         warning() << "Failed to load timestamp and/or wall clock time of most recently applied "
                      "operation; "
@@ -3307,7 +3303,7 @@ void ReplicationCoordinatorImpl::resetLastOpTimesFromOplog(OperationContext* opC
     // Update the global timestamp before setting last applied opTime forward so the last applied
     // optime is never greater than the latest in-memory cluster time.
     _externalState->setGlobalTimestamp(opCtx->getServiceContext(),
-                                       std::get<0>(lastOpTimeAndWallTime).getTimestamp());
+                                       lastOpTimeAndWallTime.opTime.getTimestamp());
 
     stdx::unique_lock<stdx::mutex> lock(_mutex);
     bool isRollbackAllowed = true;
@@ -3531,10 +3527,8 @@ void ReplicationCoordinatorImpl::_advanceCommitPoint(WithLock lk, const OpTime&
         if (_getMemberState_inlock().arbiter()) {
             // Arbiters do not store replicated data, so we consider their data trivially
             // consistent.
-            _setMyLastAppliedOpTimeAndWallTime(lk,
-                                               std::make_tuple(committedOpTime, Date_t::min()),
-                                               false,
-                                               DataConsistency::Consistent);
+            _setMyLastAppliedOpTimeAndWallTime(
+                lk, {committedOpTime, Date_t::min()}, false, DataConsistency::Consistent);
         }
 
         _setStableTimestampForStorage(lk);
diff --git a/src/mongo/db/repl/replication_coordinator_impl.h b/src/mongo/db/repl/replication_coordinator_impl.h
index 59eaa7ac157..195e11d799b 100644
--- a/src/mongo/db/repl/replication_coordinator_impl.h
+++ b/src/mongo/db/repl/replication_coordinator_impl.h
@@ -875,11 +875,10 @@ private:
      * Callback that finishes the work started in _startLoadLocalConfig and sets _rsConfigState
      * to kConfigSteady, so that we can begin processing heartbeats and reconfigs.
      */
-    void _finishLoadLocalConfig(
-        const executor::TaskExecutor::CallbackArgs& cbData,
-        const ReplSetConfig& localConfig,
-        const StatusWith<std::tuple<OpTime, Date_t>>& lastOpTimeAndWallTimeStatus,
-        const StatusWith<LastVote>& lastVoteStatus);
+    void _finishLoadLocalConfig(const executor::TaskExecutor::CallbackArgs& cbData,
+                                const ReplSetConfig& localConfig,
+                                const StatusWith<OpTimeAndWallTime>& lastOpTimeAndWallTimeStatus,
+                                const StatusWith<LastVote>& lastVoteStatus);
 
     /**
      * Start replicating data, and does an initial sync if needed first.
diff --git a/src/mongo/db/repl/replication_coordinator_mock.cpp b/src/mongo/db/repl/replication_coordinator_mock.cpp
index 3e3435d15cb..5eec6c5ae09 100644
--- a/src/mongo/db/repl/replication_coordinator_mock.cpp
+++ b/src/mongo/db/repl/replication_coordinator_mock.cpp
@@ -199,29 +199,29 @@ void ReplicationCoordinatorMock::setMyHeartbeatMessage(const std::string& msg) {
 
 void ReplicationCoordinatorMock::setMyLastAppliedOpTimeAndWallTime(
     const OpTimeAndWallTime& opTimeAndWallTime) {
-    _myLastAppliedOpTime = std::get<0>(opTimeAndWallTime);
-    _myLastAppliedWallTime = std::get<1>(opTimeAndWallTime);
+    _myLastAppliedOpTime = opTimeAndWallTime.opTime;
+    _myLastAppliedWallTime = opTimeAndWallTime.wallTime;
 }
 
 void ReplicationCoordinatorMock::setMyLastDurableOpTimeAndWallTime(
     const OpTimeAndWallTime& opTimeAndWallTime) {
-    _myLastDurableOpTime = std::get<0>(opTimeAndWallTime);
-    _myLastDurableWallTime = std::get<1>(opTimeAndWallTime);
+    _myLastDurableOpTime = opTimeAndWallTime.opTime;
+    _myLastDurableWallTime = opTimeAndWallTime.wallTime;
 }
 
 void ReplicationCoordinatorMock::setMyLastAppliedOpTimeAndWallTimeForward(
     const OpTimeAndWallTime& opTimeAndWallTime, DataConsistency consistency) {
-    if (std::get<0>(opTimeAndWallTime) > _myLastAppliedOpTime) {
-        _myLastAppliedOpTime = std::get<0>(opTimeAndWallTime);
-        _myLastAppliedWallTime = std::get<1>(opTimeAndWallTime);
+    if (opTimeAndWallTime.opTime > _myLastAppliedOpTime) {
+        _myLastAppliedOpTime = opTimeAndWallTime.opTime;
+        _myLastAppliedWallTime = opTimeAndWallTime.wallTime;
     }
 }
 
 void ReplicationCoordinatorMock::setMyLastDurableOpTimeAndWallTimeForward(
     const OpTimeAndWallTime& opTimeAndWallTime) {
-    if (std::get<0>(opTimeAndWallTime) > _myLastDurableOpTime) {
-        _myLastDurableOpTime = std::get<0>(opTimeAndWallTime);
-        _myLastDurableWallTime = std::get<1>(opTimeAndWallTime);
+    if (opTimeAndWallTime.opTime > _myLastDurableOpTime) {
+        _myLastDurableOpTime = opTimeAndWallTime.opTime;
+        _myLastDurableWallTime = opTimeAndWallTime.wallTime;
     }
 }
 
@@ -231,7 +231,7 @@ void ReplicationCoordinatorMock::resetMyLastOpTimes() {
 }
 
 OpTimeAndWallTime ReplicationCoordinatorMock::getMyLastAppliedOpTimeAndWallTime() const {
-    return std::make_tuple(_myLastAppliedOpTime, _myLastAppliedWallTime);
+    return {_myLastAppliedOpTime, _myLastAppliedWallTime};
 }
 
 OpTime ReplicationCoordinatorMock::getMyLastAppliedOpTime() const {
@@ -239,7 +239,7 @@ OpTime ReplicationCoordinatorMock::getMyLastAppliedOpTime() const {
 }
 
 OpTimeAndWallTime ReplicationCoordinatorMock::getMyLastDurableOpTimeAndWallTime() const {
-    return std::make_tuple(_myLastDurableOpTime, _myLastDurableWallTime);
+    return {_myLastDurableOpTime, _myLastDurableWallTime};
 }
 
 OpTime ReplicationCoordinatorMock::getMyLastDurableOpTime() const {
diff --git a/src/mongo/db/repl/replication_coordinator_test_fixture.h b/src/mongo/db/repl/replication_coordinator_test_fixture.h
index 41b2b1c3b82..db1406e1227 100644
--- a/src/mongo/db/repl/replication_coordinator_test_fixture.h
+++ b/src/mongo/db/repl/replication_coordinator_test_fixture.h
@@ -106,23 +106,22 @@ protected:
     }
 
     void replCoordSetMyLastAppliedOpTime(const OpTime& opTime, Date_t wallTime = Date_t::min()) {
-        getReplCoord()->setMyLastAppliedOpTimeAndWallTime(std::make_tuple(opTime, wallTime));
+        getReplCoord()->setMyLastAppliedOpTimeAndWallTime({opTime, wallTime});
     }
 
     void replCoordSetMyLastAppliedOpTimeForward(const OpTime& opTime,
                                                 ReplicationCoordinator::DataConsistency consistency,
                                                 Date_t wallTime = Date_t::min()) {
-        getReplCoord()->setMyLastAppliedOpTimeAndWallTimeForward(std::make_tuple(opTime, wallTime),
-                                                                 consistency);
+        getReplCoord()->setMyLastAppliedOpTimeAndWallTimeForward({opTime, wallTime}, consistency);
     }
 
     void replCoordSetMyLastDurableOpTime(const OpTime& opTime, Date_t wallTime = Date_t::min()) {
-        getReplCoord()->setMyLastDurableOpTimeAndWallTime(std::make_tuple(opTime, wallTime));
+        getReplCoord()->setMyLastDurableOpTimeAndWallTime({opTime, wallTime});
     }
 
     void replCoordSetMyLastDurableOpTimeForward(const OpTime& opTime,
                                                 Date_t wallTime = Date_t::min()) {
-        getReplCoord()->setMyLastDurableOpTimeAndWallTimeForward(std::make_tuple(opTime, wallTime));
+        getReplCoord()->setMyLastDurableOpTimeAndWallTimeForward({opTime, wallTime});
     }
 
     /**
diff --git a/src/mongo/db/repl/sync_tail.cpp b/src/mongo/db/repl/sync_tail.cpp
index 9602191eb7e..5870c6e57e9 100644
--- a/src/mongo/db/repl/sync_tail.cpp
+++ b/src/mongo/db/repl/sync_tail.cpp
@@ -189,11 +189,11 @@ void ApplyBatchFinalizerForJournal::_run() {
     Client::initThread("ApplyBatchFinalizerForJournal");
 
     while (true) {
-        OpTimeAndWallTime latestOpTimeAndWallTime = std::make_tuple(OpTime(), Date_t::min());
+        OpTimeAndWallTime latestOpTimeAndWallTime = {OpTime(), Date_t::min()};
 
         {
             stdx::unique_lock<stdx::mutex> lock(_mutex);
-            while (std::get<0>(_latestOpTimeAndWallTime).isNull() && !_shutdownSignaled) {
+            while (_latestOpTimeAndWallTime.opTime.isNull() && !_shutdownSignaled) {
                 _cond.wait(lock);
             }
 
@@ -202,7 +202,7 @@ void ApplyBatchFinalizerForJournal::_run() {
             }
 
             latestOpTimeAndWallTime = _latestOpTimeAndWallTime;
-            _latestOpTimeAndWallTime = std::make_tuple(OpTime(), Date_t::min());
+            _latestOpTimeAndWallTime = {OpTime(), Date_t::min()};
         }
 
         auto opCtx = cc().makeOperationContext();
@@ -805,8 +805,7 @@ void SyncTail::_oplogApplication(OplogBuffer* oplogBuffer,
             : ReplicationCoordinator::DataConsistency::Inconsistent;
         // Wall clock time is non-optional post 3.6.
         invariant(lastWallTimeInBatch);
-        finalizer->record(std::make_tuple(lastOpTimeInBatch, lastWallTimeInBatch.get()),
-                          consistency);
+        finalizer->record({lastOpTimeInBatch, lastWallTimeInBatch.get()}, consistency);
     }
 }
 
diff --git a/src/mongo/db/repl/topology_coordinator.cpp b/src/mongo/db/repl/topology_coordinator.cpp
index a9921fe31c8..3783e6338e1 100644
--- a/src/mongo/db/repl/topology_coordinator.cpp
+++ b/src/mongo/db/repl/topology_coordinator.cpp
@@ -958,14 +958,13 @@ OpTime TopologyCoordinator::getMyLastAppliedOpTime() const {
 }
 
 OpTimeAndWallTime TopologyCoordinator::getMyLastAppliedOpTimeAndWallTime() const {
-    return std::make_tuple(_selfMemberData().getLastAppliedOpTime(),
-                           _selfMemberData().getLastAppliedWallTime());
+    return {_selfMemberData().getLastAppliedOpTime(), _selfMemberData().getLastAppliedWallTime()};
 }
 
 void TopologyCoordinator::setMyLastAppliedOpTimeAndWallTime(OpTimeAndWallTime opTimeAndWallTime,
                                                             Date_t now,
                                                             bool isRollbackAllowed) {
-    auto opTime = std::get<0>(opTimeAndWallTime);
+    auto opTime = opTimeAndWallTime.opTime;
     auto& myMemberData = _selfMemberData();
     auto myLastAppliedOpTime = myMemberData.getLastAppliedOpTime();
 
@@ -986,14 +985,13 @@ OpTime TopologyCoordinator::getMyLastDurableOpTime() const {
 }
 
 OpTimeAndWallTime TopologyCoordinator::getMyLastDurableOpTimeAndWallTime() const {
-    return std::tuple(_selfMemberData().getLastDurableOpTime(),
-                      _selfMemberData().getLastDurableWallTime());
+    return {_selfMemberData().getLastDurableOpTime(), _selfMemberData().getLastDurableWallTime()};
 }
 
 void TopologyCoordinator::setMyLastDurableOpTimeAndWallTime(OpTimeAndWallTime opTimeAndWallTime,
                                                             Date_t now,
                                                             bool isRollbackAllowed) {
-    auto opTime = std::get<0>(opTimeAndWallTime);
+    auto opTime = opTimeAndWallTime.opTime;
     auto& myMemberData = _selfMemberData();
     invariant(isRollbackAllowed || opTime >= myMemberData.getLastDurableOpTime());
     myMemberData.setLastDurableOpTimeAndWallTime(opTimeAndWallTime, now);
@@ -1423,9 +1421,9 @@ void TopologyCoordinator::prepareStatusResponse(const ReplSetStatusArgs& rsStatu
     const MemberState myState = getMemberState();
     const Date_t now = rsStatusArgs.now;
     const OpTime lastOpApplied = getMyLastAppliedOpTime();
-    const Date_t lastOpAppliedWall = std::get<1>(getMyLastAppliedOpTimeAndWallTime());
+    const Date_t lastOpAppliedWall = getMyLastAppliedOpTimeAndWallTime().wallTime;
     const OpTime lastOpDurable = getMyLastDurableOpTime();
-    const Date_t lastOpDurableWall = std::get<1>(getMyLastDurableOpTimeAndWallTime());
+    const Date_t lastOpDurableWall = getMyLastDurableOpTimeAndWallTime().wallTime;
     const BSONObj& initialSyncStatus = rsStatusArgs.initialSyncStatus;
     const boost::optional<Timestamp>& lastStableRecoveryTimestamp =
         rsStatusArgs.lastStableRecoveryTimestamp;
diff --git a/src/mongo/db/repl/topology_coordinator_v1_test.cpp b/src/mongo/db/repl/topology_coordinator_v1_test.cpp
index 4dc9c528404..15da15af5d8 100644
--- a/src/mongo/db/repl/topology_coordinator_v1_test.cpp
+++ b/src/mongo/db/repl/topology_coordinator_v1_test.cpp
@@ -117,8 +117,7 @@ protected:
     }
 
     void setMyOpTime(const OpTime& opTime, const Date_t wallTime = Date_t::min()) {
-        getTopoCoord().setMyLastAppliedOpTimeAndWallTime(
-            std::make_tuple(opTime, wallTime), now(), false);
+        getTopoCoord().setMyLastAppliedOpTimeAndWallTime({opTime, wallTime}, now(), false);
     }
 
     void topoCoordSetMyLastAppliedOpTime(const OpTime& opTime,
@@ -126,7 +125,7 @@ protected:
                                          bool isRollbackAllowed,
                                          const Date_t wallTime = Date_t::min()) {
         getTopoCoord().setMyLastAppliedOpTimeAndWallTime(
-            std::make_tuple(opTime, wallTime), now, isRollbackAllowed);
+            {opTime, wallTime}, now, isRollbackAllowed);
     }
 
     void topoCoordSetMyLastDurableOpTime(const OpTime& opTime,
@@ -134,7 +133,7 @@ protected:
                                          bool isRollbackAllowed,
                                          const Date_t wallTime = Date_t::min()) {
         getTopoCoord().setMyLastDurableOpTimeAndWallTime(
-            std::make_tuple(opTime, wallTime), now, isRollbackAllowed);
+            {opTime, wallTime}, now, isRollbackAllowed);
     }
 
     void setSelfMemberState(const MemberState& newState) {
diff --git a/src/mongo/db/write_concern.cpp b/src/mongo/db/write_concern.cpp
index 5b5fd9222f9..a2cc613282d 100644
--- a/src/mongo/db/write_concern.cpp
+++ b/src/mongo/db/write_concern.cpp
@@ -53,6 +53,7 @@ namespace mongo {
 
 using std::string;
 using repl::OpTime;
+using repl::OpTimeAndWallTime;
 
 static TimerStats gleWtimeStats;
 static ServerStatusMetricField<TimerStats> displayGleLatency("getLastError.wtime", &gleWtimeStats);