SERVER-15031 Add compile-time flag to control which ReplicationCoordinator is used

SConstruct

@@ -230,6 +230,9 @@ add_option( "mm", "use main memory instead of memory mapped files" , 0 , True )
 add_option( "ssl" , "Enable SSL" , 0 , True )
 add_option( "ssl-fips-capability", "Enable the ability to activate FIPS 140-2 mode", 0, True );
 add_option( "rocksdb" , "Enable RocksDB" , 0 , False )
+add_option( "replication-implementation",
+            "Controls what implementation is used for the replication system", "?", False,
+            type="choice", choices=["impl", "legacy"], const="legacy", default="legacy" )
 
 # library choices
 js_engine_choices = ['v8-3.12', 'v8-3.25', 'none']
@@ -978,6 +981,8 @@ if has_option( "ssl" ):
     if has_option("ssl-fips-capability"):
         env.Append( CPPDEFINES=["MONGO_SSL_FIPS"] )
 
+env['MONGO_REPL_IMPL'] = get_option('replication-implementation')
+
 try:
     umask = os.umask(022)
 except OSError:

src/mongo/SConscript

@@ -965,7 +965,8 @@ env.Library("mongodwebserver",
              ],
             LIBDEPS=["coredb", "mongodandmongos"])
 
-mongodOnlyFiles = [ "db/db.cpp", "db/commands/touch.cpp", "db/mongod_options_init.cpp" ]
+mongodOnlyFiles = [ "db/db.cpp", "db/commands/touch.cpp", "db/mongod_options_init.cpp",
+                    "db/repl/replication_initializer_${MONGO_REPL_IMPL}.cpp", ]
 
 # ----- TARGETS ------
 

src/mongo/db/db.cpp

@@ -69,9 +69,7 @@
 #include "mongo/db/query/internal_plans.h"
 #include "mongo/db/range_deleter_service.h"
 #include "mongo/db/repair_database.h"
-#include "mongo/db/repl/network_interface_impl.h"
 #include "mongo/db/repl/repl_coordinator_global.h"
-#include "mongo/db/repl/repl_coordinator_legacy.h"
 #include "mongo/db/repl/repl_settings.h"
 #include "mongo/db/restapi.h"
 #include "mongo/db/server_parameters.h"
@@ -738,22 +736,6 @@ MONGO_INITIALIZER_GENERAL(CreateAuthorizationManager,
     return Status::OK();
 }
 
-namespace {
-    repl::ReplSettings globalReplSettings;
-} // namespace
-
-namespace mongo {
-    void setGlobalReplSettings(const repl::ReplSettings& settings) {
-        globalReplSettings = settings;
-    }
-} // namespace mongo
-
-MONGO_INITIALIZER_WITH_PREREQUISITES(CreateReplicationManager, ("SetGlobalEnvironment"))
-        (InitializerContext* context) {
-    repl::setGlobalReplicationCoordinator(new repl::LegacyReplicationCoordinator(globalReplSettings));
-    return Status::OK();
-}
-
 #ifdef MONGO_SSL
 MONGO_INITIALIZER_GENERAL(setSSLManagerType, 
                           MONGO_NO_PREREQUISITES, 

src/mongo/db/db.h

@@ -43,6 +43,4 @@ namespace repl {
 
     extern void (*snmpInit)();
 
-    void setGlobalReplSettings(const repl::ReplSettings& settings);
-
 } // namespace mongo

src/mongo/db/mongod_options.cpp

@@ -1181,4 +1181,16 @@ namespace mongo {
         return Status::OK();
     }
 
+namespace {
+    repl::ReplSettings globalReplSettings;
+} // namespace
+
+    void setGlobalReplSettings(const repl::ReplSettings& settings) {
+        globalReplSettings = settings;
+    }
+
+    const repl::ReplSettings& getGlobalReplSettings() {
+        return globalReplSettings;
+    }
+
 } // namespace mongo

src/mongo/db/mongod_options.h

@@ -85,4 +85,7 @@ namespace mongo {
     StatusWith<repl::ReplSettings> parseMongodReplicationOptions(const moe::Environment& params);
 
     Status storeMongodOptions(const moe::Environment& params, const std::vector<std::string>& args);
+
+    void setGlobalReplSettings(const repl::ReplSettings& settings);
+    const repl::ReplSettings& getGlobalReplSettings();
 }

src/mongo/db/repl/replication_initializer_impl.cpp

@@ -0,0 +1,59 @@
+/**
+ *    Copyright (C) 2014 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    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
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    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 GNU Affero General 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::kReplication
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/base/init.h"
+#include "mongo/base/status.h"
+#include "mongo/db/mongod_options.h"
+#include "mongo/db/repl/repl_coordinator_external_state_impl.h"
+#include "mongo/db/repl/repl_coordinator_impl.h"
+#include "mongo/db/repl/repl_coordinator_global.h"
+#include "mongo/db/repl/repl_settings.h"
+#include "mongo/db/repl/network_interface_impl.h"
+#include "mongo/db/repl/topology_coordinator_impl.h"
+#include "mongo/util/time_support.h"
+
+namespace mongo {
+namespace {
+
+MONGO_INITIALIZER_WITH_PREREQUISITES(CreateReplicationManager, ("SetGlobalEnvironment"))
+        (InitializerContext* context) {
+    repl::setGlobalReplicationCoordinator(new repl::ReplicationCoordinatorImpl(
+            getGlobalReplSettings(),
+            new repl::ReplicationCoordinatorExternalStateImpl,
+            new repl::NetworkInterfaceImpl,
+            new repl::TopologyCoordinatorImpl(Seconds(repl::maxSyncSourceLagSecs)),
+            static_cast<int64_t>(curTimeMillis64())));
+    return Status::OK();
+}
+
+} // namespace
+} // namespace mongo

src/mongo/db/repl/replication_initializer_legacy.cpp

@@ -0,0 +1,50 @@
+/**
+ *    Copyright (C) 2014 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    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
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    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 GNU Affero General 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::kReplication
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/base/init.h"
+#include "mongo/db/mongod_options.h"
+#include "mongo/db/repl/repl_coordinator_global.h"
+#include "mongo/db/repl/repl_coordinator_legacy.h"
+#include "mongo/db/repl/repl_settings.h"
+
+namespace mongo {
+namespace {
+
+MONGO_INITIALIZER_WITH_PREREQUISITES(CreateReplicationManager, ("SetGlobalEnvironment"))
+        (InitializerContext* context) {
+    repl::setGlobalReplicationCoordinator(
+            new repl::LegacyReplicationCoordinator(getGlobalReplSettings()));
+    return Status::OK();
+}
+
+} // namespace
+} // namespace mongo