5 files changed, 106 insertions, 2 deletions
diff --git a/src/mongo/db/repl/SConscript b/src/mongo/db/repl/SConscript
index a0659443834..93d8db2fea0 100644
--- a/src/mongo/db/repl/SConscript
+++ b/src/mongo/db/repl/SConscript
@@ -550,6 +550,18 @@ env.Library(
     LIBDEPS_PRIVATE=[
         '$BUILD_DIR/mongo/db/commands/mongod_fsync',
         'replication_auth',
+        'tla_plus_trace_repl',
+    ],
+)
+
+env.Library(
+    target='tla_plus_trace_repl',
+    source=[
+        'tla_plus_trace_repl.cpp',
+    ],
+    LIBDEPS=[
+        '$BUILD_DIR/mongo/base',
+        '$BUILD_DIR/mongo/util/fail_point',
     ],
 )
 
@@ -938,7 +950,7 @@ env.Library(
         '$BUILD_DIR/mongo/client/clientdriver_network',
         '$BUILD_DIR/mongo/util/concurrency/thread_pool',
         '$BUILD_DIR/mongo/util/net/network',
-    ],        
+    ],
     LIBDEPS_PRIVATE=[
         'repl_server_parameters',
         'replication_auth',
diff --git a/src/mongo/db/repl/tla_plus_trace_repl.cpp b/src/mongo/db/repl/tla_plus_trace_repl.cpp
new file mode 100644
index 00000000000..31a345daf83
--- /dev/null
+++ b/src/mongo/db/repl/tla_plus_trace_repl.cpp
@@ -0,0 +1,44 @@
+/**
+ *    Copyright (C) 2019-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.
+ */
+
+#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kTlaPlusTrace
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/repl/tla_plus_trace_repl.h"
+
+#include "mongo/util/log.h"
+
+namespace mongo {
+namespace repl {
+
+MONGO_FAIL_POINT_DEFINE(logForTLAPlusSpecs)
+
+}  // namespace repl
+}  // namespace mongo
diff --git a/src/mongo/db/repl/tla_plus_trace_repl.h b/src/mongo/db/repl/tla_plus_trace_repl.h
new file mode 100644
index 00000000000..bf0e9412601
--- /dev/null
+++ b/src/mongo/db/repl/tla_plus_trace_repl.h
@@ -0,0 +1,43 @@
+/**
+ *    Copyright (C) 2019-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.
+ */
+
+#pragma once
+
+#include "mongo/util/fail_point.h"
+
+namespace mongo {
+namespace repl {
+
+/*
+ * Log execution traces so we can compare MongoDB's implementation to our TLA+ specs.
+ */
+extern FailPoint logForTLAPlusSpecs;
+
+}  // namespace repl
+}  // namespace mongo
diff --git a/src/mongo/logger/log_component.cpp b/src/mongo/logger/log_component.cpp
index ec389788d43..56a93625b23 100644
--- a/src/mongo/logger/log_component.cpp
+++ b/src/mongo/logger/log_component.cpp
@@ -146,6 +146,8 @@ StringData LogComponent::toStringData() const {
             return "transaction"_sd;
         case kConnectionPool:
             return "connectionPool"_sd;
+        case kTlaPlusTrace:
+            return "tlaPlusTrace"_sd;
         case kNumLogComponents:
             return "total"_sd;
             // No default. Compiler should complain if there's a log component that's not handled.
@@ -234,6 +236,8 @@ StringData LogComponent::getNameForLog() const {
             return "TXN     "_sd;
         case kConnectionPool:
             return "CONNPOOL"_sd;
+        case kTlaPlusTrace:
+            return "TLA_PLUS"_sd;
         case kNumLogComponents:
             return "TOTAL   "_sd;
             // No default. Compiler should complain if there's a log component that's not handled.
diff --git a/src/mongo/logger/log_component.h b/src/mongo/logger/log_component.h
index 50b07b55283..324c36ed55c 100644
--- a/src/mongo/logger/log_component.h
+++ b/src/mongo/logger/log_component.h
@@ -71,7 +71,8 @@ public:
         kTracking,
         kTransaction,
         kConnectionPool,
-        kNumLogComponents
+        kTlaPlusTrace,
+        kNumLogComponents,
     };
 
     /* implicit */ LogComponent(Value value) : _value(value) {}