SERVER-39538 Convert replication setParameters to IDL

18 files changed, 385 insertions, 219 deletions

diff --git a/src/mongo/db/mongod_options.h b/src/mongo/db/mongod_options.h
index f1e56500a30..62f86b51611 100644
--- a/src/mongo/db/mongod_options.h
+++ b/src/mongo/db/mongod_options.h
@@ -47,7 +47,6 @@ class Environment;
 
 namespace moe = mongo::optionenvironment;
 
-extern bool skipShardingConfigurationChecks;
 
 Status addMongodOptions(moe::OptionSection* options);
 
diff --git a/src/mongo/db/repl/SConscript b/src/mongo/db/repl/SConscript
index fd3f16f81b7..ae04d8d9ceb 100644
--- a/src/mongo/db/repl/SConscript
+++ b/src/mongo/db/repl/SConscript
@@ -5,6 +5,16 @@ Import("env")
 env = env.Clone()
 
 env.Library(
+    target='repl_server_parameters',
+    source=[
+        env.Idlc('repl_server_parameters.idl')[0]
+    ],
+    LIBDEPS_PRIVATE=[
+        '$BUILD_DIR/mongo/idl/server_parameter',
+    ]
+)
+
+env.Library(
     target='oplog',
     source=[
         'apply_ops.cpp',
@@ -149,11 +159,11 @@ env.Library(
         '$BUILD_DIR/mongo/client/connection_pool',
         '$BUILD_DIR/mongo/client/fetcher',
         '$BUILD_DIR/mongo/db/concurrency/write_conflict_exception',
-        '$BUILD_DIR/mongo/db/server_parameters',
         '$BUILD_DIR/mongo/db/service_context',
         '$BUILD_DIR/mongo/util/concurrency/thread_pool',
     ],
     LIBDEPS_PRIVATE=[
+        'repl_server_parameters',
         '$BUILD_DIR/mongo/executor/thread_pool_task_executor',
         '$BUILD_DIR/mongo/db/commands/test_commands_enabled',
     ],
@@ -163,11 +173,11 @@ env.Library(
     target='repl_settings',
     source=[
         'repl_settings.cpp',
-        'repl_settings_init.cpp',
+        env.Idlc('repl_settings.idl')[0],
     ],
     LIBDEPS=[
         '$BUILD_DIR/mongo/base',
-        '$BUILD_DIR/mongo/db/server_parameters',
+        '$BUILD_DIR/mongo/idl/server_parameter',
     ],
 )
 
@@ -650,10 +660,12 @@ env.Library(
         '$BUILD_DIR/mongo/base',
         '$BUILD_DIR/mongo/db/auth/authorization_manager_global',
         '$BUILD_DIR/mongo/db/namespace_string',
-        '$BUILD_DIR/mongo/db/server_parameters',
         '$BUILD_DIR/mongo/util/concurrency/thread_pool',
         'oplog_entry',
     ],
+    LIBDEPS_PRIVATE=[
+        'repl_server_parameters',
+    ],
 )
 
 env.Library(
@@ -1023,6 +1035,7 @@ env.Library('replica_set_messages',
                 'repl_set_tag.cpp',
                 'update_position_args.cpp',
                 'last_vote.cpp',
+                env.Idlc('repl_set_config.idl')[0],
             ],
             LIBDEPS=[
                 '$BUILD_DIR/mongo/base',
@@ -1035,6 +1048,9 @@ env.Library('replica_set_messages',
                 '$BUILD_DIR/mongo/rpc/command_status',
                 'optime',
                 'read_concern_args',
+            ],
+            LIBDEPS_PRIVATE=[
+                '$BUILD_DIR/mongo/idl/server_parameter',
             ])
 
 env.CppUnitTest('repl_set_config_test',
@@ -1128,6 +1144,7 @@ env.Library(
         '$BUILD_DIR/mongo/executor/task_executor_interface',
     ],
     LIBDEPS_PRIVATE=[
+        'repl_server_parameters',
         '$BUILD_DIR/mongo/db/commands/server_status_core',
     ],
 )
@@ -1271,6 +1288,9 @@ env.Library(
         '$BUILD_DIR/mongo/s/query/async_results_merger',
         '$BUILD_DIR/mongo/util/progress_meter',
     ],
+    LIBDEPS_PRIVATE=[
+        'repl_server_parameters',
+    ],
 )
 
 env.CppUnitTest(
@@ -1296,6 +1316,7 @@ env.Library(
         '$BUILD_DIR/mongo/executor/task_executor_interface',
     ],
     LIBDEPS_PRIVATE=[
+        'repl_server_parameters',
         '$BUILD_DIR/mongo/db/commands/list_collections_filter',
     ],
 )
@@ -1450,7 +1471,9 @@ env.Library(
         'repl_coordinator_interface',
         'storage_interface',
         '$BUILD_DIR/mongo/base',
-        '$BUILD_DIR/mongo/db/server_parameters',
+    ],
+    LIBDEPS_PRIVATE=[
+        'repl_server_parameters',
     ],
 )
 
@@ -1500,6 +1523,7 @@ env.Library(
         'storage_interface',
     ],
     LIBDEPS_PRIVATE=[
+        'repl_server_parameters',
         '$BUILD_DIR/mongo/db/commands/feature_compatibility_parsers',
     ]
 )
@@ -1641,6 +1665,7 @@ env.Library(
         'rollback_source_impl',
     ],
     LIBDEPS_PRIVATE=[
+        'repl_server_parameters',
         '$BUILD_DIR/mongo/db/commands/mongod_fcv',
         '$BUILD_DIR/mongo/db/commands/test_commands_enabled',
     ],
diff --git a/src/mongo/db/repl/abstract_oplog_fetcher.cpp b/src/mongo/db/repl/abstract_oplog_fetcher.cpp
index e47909a3419..a3f27e65e94 100644
--- a/src/mongo/db/repl/abstract_oplog_fetcher.cpp
+++ b/src/mongo/db/repl/abstract_oplog_fetcher.cpp
@@ -37,7 +37,7 @@
 #include "mongo/bson/util/bson_extract.h"
 #include "mongo/db/commands/server_status_metric.h"
 #include "mongo/db/jsobj.h"
-#include "mongo/db/server_parameters.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/stdx/memory.h"
 #include "mongo/stdx/mutex.h"
 #include "mongo/util/assert_util.h"
@@ -52,16 +52,6 @@ Counter64 readersCreatedStats;
 ServerStatusMetricField<Counter64> displayReadersCreated("repl.network.readersCreated",
                                                          &readersCreatedStats);
 
-// Number of seconds for the `maxTimeMS` on the initial `find` command.
-//
-// For the initial 'find' request, we provide a generous timeout, to account for the potentially
-// slow process of a sync source finding the lastApplied optime provided in a node's query in its
-// oplog.
-MONGO_EXPORT_SERVER_PARAMETER(oplogInitialFindMaxSeconds, int, 60);
-
-// Number of seconds for the `maxTimeMS` on any retried `find` commands.
-MONGO_EXPORT_SERVER_PARAMETER(oplogRetriedFindMaxSeconds, int, 2);
-
 // Number of milliseconds to add to the `find` and `getMore` timeouts to calculate the network
 // timeout for the requests.
 const Milliseconds kNetworkTimeoutBufferMS{5000};
@@ -69,7 +59,6 @@ const Milliseconds kNetworkTimeoutBufferMS{5000};
 // Default `maxTimeMS` timeout for `getMore`s.
 const Milliseconds kDefaultOplogGetMoreMaxMS{5000};
 
-
 }  // namespace
 
 AbstractOplogFetcher::AbstractOplogFetcher(executor::TaskExecutor* executor,
diff --git a/src/mongo/db/repl/bgsync.cpp b/src/mongo/db/repl/bgsync.cpp
index 698edce2fab..3181bc132ee 100644
--- a/src/mongo/db/repl/bgsync.cpp
+++ b/src/mongo/db/repl/bgsync.cpp
@@ -47,6 +47,7 @@
 #include "mongo/db/repl/oplog.h"
 #include "mongo/db/repl/oplog_interface_local.h"
 #include "mongo/db/repl/oplog_interface_remote.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/db/repl/replication_coordinator.h"
 #include "mongo/db/repl/replication_coordinator_impl.h"
 #include "mongo/db/repl/replication_process.h"
@@ -54,7 +55,6 @@
 #include "mongo/db/repl/rs_rollback.h"
 #include "mongo/db/repl/storage_interface.h"
 #include "mongo/db/s/shard_identity_rollback_notifier.h"
-#include "mongo/db/server_parameters.h"
 #include "mongo/rpc/get_status_from_command_result.h"
 #include "mongo/rpc/metadata/repl_set_metadata.h"
 #include "mongo/stdx/memory.h"
@@ -72,32 +72,6 @@ namespace {
 const int kSleepToAllowBatchingMillis = 2;
 const int kSmallBatchLimitBytes = 40000;
 const Milliseconds kRollbackOplogSocketTimeout(10 * 60 * 1000);
-// 16MB max batch size / 12 byte min doc size * 10 (for good measure) = defaultBatchSize to use.
-const auto defaultBatchSize = (16 * 1024 * 1024) / 12 * 10;
-
-// The batchSize to use for the find/getMore queries called by the OplogFetcher
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(bgSyncOplogFetcherBatchSize, int, defaultBatchSize);
-
-// The batchSize to use for the find/getMore queries called by the rollback common point resolver.
-// A batchSize of 0 means that the 'find' and 'getMore' commands will be given no batchSize.
-// We set the default to 2000 to prevent the sync source from having to read too much data at once,
-// and reduce the chance of a socket timeout.
-// We choose 2000 for (10 minute timeout) * (60 sec / min) * (50 MB / second) / (16 MB / document).
-constexpr int defaultRollbackBatchSize = 2000;
-MONGO_EXPORT_SERVER_PARAMETER(rollbackRemoteOplogQueryBatchSize, int, defaultRollbackBatchSize)
-    ->withValidator([](const auto& potentialNewValue) {
-        if (potentialNewValue < 0) {
-            return Status(ErrorCodes::BadValue,
-                          "rollbackRemoteOplogQueryBatchSize cannot be negative.");
-        }
-
-        return Status::OK();
-    });
-
-// If 'forceRollbackViaRefetch' is true, always perform rollbacks via the refetch algorithm, even if
-// the storage engine supports rollback via recover to timestamp.
-constexpr bool forceRollbackViaRefetchByDefault = false;
-MONGO_EXPORT_SERVER_PARAMETER(forceRollbackViaRefetch, bool, forceRollbackViaRefetchByDefault);
 
 /**
  * Extends DataReplicatorExternalStateImpl to be member state aware.
diff --git a/src/mongo/db/repl/collection_cloner.cpp b/src/mongo/db/repl/collection_cloner.cpp
index a30cf1496c8..ac0cfb22647 100644
--- a/src/mongo/db/repl/collection_cloner.cpp
+++ b/src/mongo/db/repl/collection_cloner.cpp
@@ -43,9 +43,9 @@
 #include "mongo/db/namespace_string.h"
 #include "mongo/db/query/cursor_response.h"
 #include "mongo/db/repl/oplogreader.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/db/repl/storage_interface.h"
 #include "mongo/db/repl/storage_interface_mock.h"
-#include "mongo/db/server_parameters.h"
 #include "mongo/rpc/get_status_from_command_result.h"
 #include "mongo/util/assert_util.h"
 #include "mongo/util/destructor_guard.h"
@@ -66,14 +66,6 @@ constexpr auto kCountResponseDocumentCountFieldName = "n"_sd;
 const int kProgressMeterSecondsBetween = 60;
 const int kProgressMeterCheckInterval = 128;
 
-// The number of attempts for the count command, which gets the document count.
-MONGO_EXPORT_SERVER_PARAMETER(numInitialSyncCollectionCountAttempts, int, 3);
-// The number of attempts for the listIndexes commands.
-MONGO_EXPORT_SERVER_PARAMETER(numInitialSyncListIndexesAttempts, int, 3);
-// The number of attempts for the find command, which gets the data.
-MONGO_EXPORT_SERVER_PARAMETER(numInitialSyncCollectionFindAttempts, int, 3);
-// Whether to use the "exhaust cursor" feature when retrieving collection data.
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(collectionClonerUsesExhaust, bool, true);
 }  // namespace
 
 // Failpoint which causes initial sync to hang before establishing its cursor to clone the
diff --git a/src/mongo/db/repl/data_replicator_external_state_impl.cpp b/src/mongo/db/repl/data_replicator_external_state_impl.cpp
index bcd91dd6c23..f2e2c1386d5 100644
--- a/src/mongo/db/repl/data_replicator_external_state_impl.cpp
+++ b/src/mongo/db/repl/data_replicator_external_state_impl.cpp
@@ -38,11 +38,11 @@
 #include "mongo/db/repl/oplog_buffer_blocking_queue.h"
 #include "mongo/db/repl/oplog_buffer_collection.h"
 #include "mongo/db/repl/oplog_buffer_proxy.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/db/repl/replication_coordinator.h"
 #include "mongo/db/repl/replication_coordinator_external_state.h"
 #include "mongo/db/repl/replication_process.h"
 #include "mongo/db/repl/storage_interface.h"
-#include "mongo/db/server_parameters.h"
 #include "mongo/util/log.h"
 
 namespace mongo {
@@ -52,15 +52,6 @@ namespace {
 const char kCollectionOplogBufferName[] = "collection";
 const char kBlockingQueueOplogBufferName[] = "inMemoryBlockingQueue";
 
-// Set this to specify whether to use a collection to buffer the oplog on the destination server
-// during initial sync to prevent rolling over the oplog.
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(initialSyncOplogBuffer,
-                                      std::string,
-                                      kCollectionOplogBufferName);
-
-// Set this to specify size of read ahead buffer in the OplogBufferCollection.
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(initialSyncOplogBufferPeekCacheSize, int, 10000);
-
 MONGO_INITIALIZER(initialSyncOplogBuffer)(InitializerContext*) {
     if ((initialSyncOplogBuffer != kCollectionOplogBufferName) &&
         (initialSyncOplogBuffer != kBlockingQueueOplogBufferName)) {
diff --git a/src/mongo/db/repl/database_cloner.cpp b/src/mongo/db/repl/database_cloner.cpp
index 073cfced04b..3b29095c8fd 100644
--- a/src/mongo/db/repl/database_cloner.cpp
+++ b/src/mongo/db/repl/database_cloner.cpp
@@ -40,8 +40,8 @@
 #include "mongo/client/remote_command_retry_scheduler.h"
 #include "mongo/db/catalog/collection_options.h"
 #include "mongo/db/commands/list_collections_filter.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/db/repl/storage_interface.h"
-#include "mongo/db/server_parameters.h"
 #include "mongo/stdx/functional.h"
 #include "mongo/util/assert_util.h"
 #include "mongo/util/destructor_guard.h"
@@ -66,22 +66,6 @@ const char* kOptionsFieldName = "options";
 const char* kInfoFieldName = "info";
 const char* kUUIDFieldName = "uuid";
 
-// The batch size (number of documents) to use for the queries in the CollectionCloner.  Default of
-// 0 means the limit is the number of documents which fit in a single BSON object.
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(collectionClonerBatchSize, int, 0)
-    ->withValidator([](const int& batchSize) {
-        return (batchSize >= 0)
-            ? Status::OK()
-            : Status(ErrorCodes::Error(50952),
-                     str::stream()
-                         << "collectionClonerBatchSize must be greater than or equal to 0. '"
-                         << batchSize
-                         << "' is an invalid setting.");
-    });
-
-// The number of attempts for the listCollections commands.
-MONGO_EXPORT_SERVER_PARAMETER(numInitialSyncListCollectionsAttempts, int, 3);
-
 // Failpoint which causes initial sync to hang right after listCollections, but before cloning
 // any colelctions in the 'database' database.
 MONGO_FAIL_POINT_DEFINE(initialSyncHangAfterListCollections);
diff --git a/src/mongo/db/repl/initial_syncer.cpp b/src/mongo/db/repl/initial_syncer.cpp
index 237985c6e8a..616b8961a94 100644
--- a/src/mongo/db/repl/initial_syncer.cpp
+++ b/src/mongo/db/repl/initial_syncer.cpp
@@ -53,11 +53,11 @@
 #include "mongo/db/repl/oplog_buffer.h"
 #include "mongo/db/repl/oplog_fetcher.h"
 #include "mongo/db/repl/optime.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/db/repl/replication_consistency_markers.h"
 #include "mongo/db/repl/replication_process.h"
 #include "mongo/db/repl/storage_interface.h"
 #include "mongo/db/repl/sync_source_selector.h"
-#include "mongo/db/server_parameters.h"
 #include "mongo/executor/task_executor.h"
 #include "mongo/executor/thread_pool_task_executor.h"
 #include "mongo/rpc/metadata/repl_set_metadata.h"
@@ -109,18 +109,6 @@ using QueryResponseStatus = StatusWith<Fetcher::QueryResponse>;
 using UniqueLock = stdx::unique_lock<stdx::mutex>;
 using LockGuard = stdx::lock_guard<stdx::mutex>;
 
-// 16MB max batch size / 12 byte min doc size * 10 (for good measure) = defaultBatchSize to use.
-const auto defaultBatchSize = (16 * 1024 * 1024) / 12 * 10;
-
-// The number of attempts to connect to a sync source.
-MONGO_EXPORT_SERVER_PARAMETER(numInitialSyncConnectAttempts, int, 10);
-
-// The number of attempts to call find on the remote oplog.
-MONGO_EXPORT_SERVER_PARAMETER(numInitialSyncOplogFindAttempts, int, 3);
-
-// The batchSize to use for the find/getMore queries called by the OplogFetcher
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(initialSyncOplogFetcherBatchSize, int, defaultBatchSize);
-
 // The number of initial sync attempts that have failed since server startup. Each instance of
 // InitialSyncer may run multiple attempts to fulfill an initial sync request that is triggered
 // when InitialSyncer::startup() is called.
diff --git a/src/mongo/db/repl/noop_writer.cpp b/src/mongo/db/repl/noop_writer.cpp
index eb698db85ea..90b15f0f4ac 100644
--- a/src/mongo/db/repl/noop_writer.cpp
+++ b/src/mongo/db/repl/noop_writer.cpp
@@ -40,7 +40,7 @@
 #include "mongo/db/op_observer.h"
 #include "mongo/db/repl/noop_writer.h"
 #include "mongo/db/repl/oplog.h"
-#include "mongo/db/server_parameters.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/stdx/functional.h"
 #include "mongo/util/concurrency/idle_thread_block.h"
 #include "mongo/util/log.h"
@@ -50,8 +50,6 @@ namespace repl {
 
 namespace {
 
-MONGO_EXPORT_SERVER_PARAMETER(writePeriodicNoops, bool, true);
-
 const auto kMsgObj = BSON("msg"
                           << "periodic noop");
 
diff --git a/src/mongo/db/repl/oplog_applier.cpp b/src/mongo/db/repl/oplog_applier.cpp
index b975cf9a3d1..eb06a50d681 100644
--- a/src/mongo/db/repl/oplog_applier.cpp
+++ b/src/mongo/db/repl/oplog_applier.cpp
@@ -35,39 +35,13 @@
 
 #include "mongo/db/auth/authorization_session.h"
 #include "mongo/db/namespace_string.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/db/repl/sync_tail.h"
-#include "mongo/db/server_parameters.h"
 #include "mongo/util/log.h"
 
 namespace mongo {
 namespace repl {
 
-namespace {
-
-/**
- * This server parameter determines the number of writer threads OplogApplier will have.
- */
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(replWriterThreadCount, int, 16)
-    ->withValidator([](const int& newVal) {
-        if (newVal < 1 || newVal > 256) {
-            return Status(ErrorCodes::BadValue, "replWriterThreadCount must be between 1 and 256");
-        }
-
-        return Status::OK();
-    });
-
-MONGO_EXPORT_SERVER_PARAMETER(replBatchLimitOperations, int, 5 * 1000)
-    ->withValidator([](const int& newVal) {
-        if (newVal < 1 || newVal > (1000 * 1000)) {
-            return Status(ErrorCodes::BadValue,
-                          "replBatchLimitOperations must be between 1 and 1 million, inclusive");
-        }
-
-        return Status::OK();
-    });
-
-}  // namespace
-
 using CallbackArgs = executor::TaskExecutor::CallbackArgs;
 
 // static
diff --git a/src/mongo/db/repl/repl_server_parameters.idl b/src/mongo/db/repl/repl_server_parameters.idl
new file mode 100644
index 00000000000..b7b2447649a
--- /dev/null
+++ b/src/mongo/db/repl/repl_server_parameters.idl
@@ -0,0 +1,239 @@
+# Copyright (C) 2018-present MongoDB, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the Server Side Public License, version 1,
+# as published by MongoDB, Inc.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# Server Side Public License for more details.
+#
+# You should have received a copy of the Server Side Public License
+# along with this program. If not, see
+# <http://www.mongodb.com/licensing/server-side-public-license>.
+#
+# As a special exception, the copyright holders give permission to link the
+# code of portions of this program with the OpenSSL library under certain
+# conditions as described in each individual source file and distribute
+# linked combinations including the program with the OpenSSL library. You
+# must comply with the Server Side Public License in all respects for
+# all of the code used other than as permitted herein. If you modify file(s)
+# with this exception, you may extend this exception to your version of the
+# file(s), but you are not obligated to do so. If you do not wish to do so,
+# delete this exception statement from your version. If you delete this
+# exception statement from all source files in the program, then also delete
+# it in the license file.
+#
+
+# server setParameters for replication
+
+global:
+    cpp_namespace: "mongo::repl"
+
+imports:
+    - "mongo/idl/basic_types.idl"
+
+server_parameters:
+    # From data_replicator_external_state_impl.cpp
+    initialSyncOplogBuffer:
+        description: >-
+            Set this to specify whether to use a collection to buffer the oplog on the
+            destination server during initial sync to prevent rolling over the oplog.
+        set_at: startup
+        cpp_vartype: std::string
+        cpp_varname: initialSyncOplogBuffer
+        default: "collection"
+
+    initialSyncOplogBufferPeekCacheSize:
+        description: Set this to specify size of read ahead buffer in the OplogBufferCollection.
+        set_at: startup
+        cpp_vartype: int
+        cpp_varname: initialSyncOplogBufferPeekCacheSize
+        default: 10000
+
+    # From initial_syncer.cpp
+    numInitialSyncConnectAttempts:
+        description: The number of attempts to connect to a sync source
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: numInitialSyncConnectAttempts
+        default: 10
+
+    numInitialSyncOplogFindAttempts:
+        description: The number of attempts to call find on the remote oplog
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: numInitialSyncOplogFindAttempts
+        default: 3
+
+    initialSyncOplogFetcherBatchSize:
+        description: The batchSize to use for the find/getMore queries called by the OplogFetcher
+        set_at: startup
+        cpp_vartype: int
+        cpp_varname: initialSyncOplogFetcherBatchSize
+        # 16MB max batch size / 12 byte min doc size * 10 (for good measure) =
+        #     defaultBatchSize to use.
+        default:
+            expr: (16 * 1024 * 1024) / 12 * 10
+
+    # From abstract_oplog_fetcher.cpp
+    oplogInitialFindMaxSeconds:
+        description: >-
+            Number of seconds for the `maxTimeMS` on the initial `find` command.
+            For the initial 'find' request, we provide a generous timeout, to account for
+            the potentially slow process of a sync source finding the lastApplied optime
+            provided in a node's query in its oplog.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: oplogInitialFindMaxSeconds
+        default: 60
+
+    oplogRetriedFindMaxSeconds:
+        description: Number of seconds for the `maxTimeMS` on any retried `find` commands
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: oplogRetriedFindMaxSeconds
+        default: 2
+
+    # From bgsync.cpp
+    bgSyncOplogFetcherBatchSize:
+        description: The batchSize to use for the find/getMore queries called by the OplogFetcher
+        set_at: startup
+        cpp_vartype: int
+        cpp_varname: bgSyncOplogFetcherBatchSize
+        # 16MB max batch size / 12 byte min doc size * 10 (for good measure) =
+        #     defaultBatchSize to use.
+        default:
+            expr: (16 * 1024 * 1024) / 12 * 10
+
+    rollbackRemoteOplogQueryBatchSize:
+        description: >-
+            The batchSize to use for the find/getMore queries called by the rollback
+            common point resolver. A batchSize of 0 means that the 'find' and 'getMore'
+            commands will be given no batchSize. We set the default to 2000 to prevent
+            the sync source from having to read too much data at once, and reduce the
+            chance of a socket timeout.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: rollbackRemoteOplogQueryBatchSize
+        # We choose 2000 for (10 minute timeout) * (60 sec / min) * (50 MB / second) /
+        #     (16 MB / document).
+        default: 2000
+
+    forceRollbackViaRefetch:
+        description: >-
+            If 'forceRollbackViaRefetch' is true, always perform rollbacks via the
+            refetch algorithm, even if the storage engine supports rollback via recover
+            to timestamp.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<bool>
+        cpp_varname: forceRollbackViaRefetch
+        default: false
+
+    # From noop_writer.cpp
+    writePeriodicNoops:
+        description: Sets whether to write periodic noops or not
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<bool>
+        cpp_varname: writePeriodicNoops
+        default: true
+
+    # From collection_cloner.cpp
+    numInitialSyncCollectionCountAttempts:
+        description: The number of attempts for the count command, which gets the document count.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: numInitialSyncCollectionCountAttempts
+        default: 3
+
+    numInitialSyncListIndexesAttempts:
+        description: The number of attempts for the listIndexes commands.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: numInitialSyncListIndexesAttempts
+        default: 3
+
+    numInitialSyncCollectionFindAttempts:
+        description: The number of attempts for the find command, which gets the data.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: numInitialSyncCollectionFindAttempts
+        default: 3
+
+    collectionClonerUsesExhaust:
+        description: Whether to use the "exhaust cursor" feature when retrieving collection data.
+        set_at: startup
+        cpp_vartype: bool
+        cpp_varname: collectionClonerUsesExhaust
+        default: true
+
+    # From database_cloner.cpp
+    collectionClonerBatchSize:
+        description: >-
+            The batch size (number of documents) to use for the queries in the
+            CollectionCloner. Default of '0' means the limit is the number of documents
+            that will fit in a single BSON object.
+        set_at: startup
+        cpp_vartype: int
+        cpp_varname: collectionClonerBatchSize
+        default: 0
+        validator:
+            gte: 0
+
+    numInitialSyncListCollectionsAttempts:
+        description: The number of attempts for the listCollections commands.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: numInitialSyncListCollectionsAttempts
+        default: 3
+
+    # From replication_coordinator_external_state_impl.cpp
+    oplogFetcherSteadyStateMaxFetcherRestarts:
+        description: >-
+            Set this to specify the maximum number of times the oplog fetcher will
+            consecutively restart the oplog tailing query on non-cancellation errors
+            during steady state replication.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: oplogFetcherSteadyStateMaxFetcherRestarts
+        default: 1
+        validator:
+            gte: 0
+
+    oplogFetcherInitialSyncMaxFetcherRestarts:
+        description: >-
+            Set this to specify the maximum number of times the oplog fetcher will
+            consecutively restart the oplog tailing query on non-cancellation errors
+            during initial sync. By default we provide a generous amount of restarts
+            to avoid potentially restarting an entire initial sync from scratch.
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: oplogFetcherInitialSyncMaxFetcherRestarts
+        default: 10
+        validator:
+            gte: 0
+
+    # From oplog_applier.cpp
+    replWriterThreadCount:
+        description: The number of threads in the thread pool used to apply the oplog
+        set_at: startup
+        cpp_vartype: int
+        cpp_varname: replWriterThreadCount
+        default: 16
+        validator:
+            gte: 1
+            lte: 256
+
+    replBatchLimitOperations:
+        description: The maximum number of operations to apply in a single batch
+        set_at: [ startup, runtime ]
+        cpp_vartype: AtomicWord<int>
+        cpp_varname: replBatchLimitOperations
+        default:
+            expr: 5 * 1000
+        validator:
+            gte: 1
+            lte:
+                expr: 1000 * 1000
+
diff --git a/src/mongo/db/repl/repl_set_config.cpp b/src/mongo/db/repl/repl_set_config.cpp
index 2f5b4c5d5b8..d0a9f38035b 100644
--- a/src/mongo/db/repl/repl_set_config.cpp
+++ b/src/mongo/db/repl/repl_set_config.cpp
@@ -38,17 +38,10 @@
 #include "mongo/db/jsobj.h"
 #include "mongo/db/mongod_options.h"
 #include "mongo/db/server_options.h"
-#include "mongo/db/server_parameters.h"
 #include "mongo/stdx/functional.h"
 #include "mongo/util/stringutils.h"
 
 namespace mongo {
-/**
- * Dont run any sharding validations. Can not be combined with --configsvr or shardvr. Intended to
- * allow restarting config server or shard as an independent replica set.
- */
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(skipShardingConfigurationChecks, bool, false);
-
 namespace repl {
 
 const size_t ReplSetConfig::kMaxMembers;
diff --git a/src/mongo/db/repl/repl_set_config.idl b/src/mongo/db/repl/repl_set_config.idl
new file mode 100644
index 00000000000..92089aef855
--- /dev/null
+++ b/src/mongo/db/repl/repl_set_config.idl
@@ -0,0 +1,41 @@
+# 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.
+#
+
+global:
+    cpp_namespace: "mongo"
+
+server_parameters:
+    skipShardingConfigurationChecks:
+        description: Dont run any sharding validations. Can not be combined with --configsvr or 
+                     shardvr. Intended to allow restarting config server or shard as an 
+                     independent replica set.
+        set_at: startup
+        cpp_vartype: bool
+        cpp_varname: skipShardingConfigurationChecks
+        default: false
+
diff --git a/src/mongo/db/repl/repl_settings.cpp b/src/mongo/db/repl/repl_settings.cpp
index 1174448c28a..f8abdd02cf8 100644
--- a/src/mongo/db/repl/repl_settings.cpp
+++ b/src/mongo/db/repl/repl_settings.cpp
@@ -32,20 +32,14 @@
 #include "mongo/platform/basic.h"
 
 #include "mongo/db/repl/repl_settings.h"
-#include "mongo/db/server_parameters.h"
 
+#include "mongo/db/repl/repl_server_parameters_gen.h"
+#include "mongo/db/repl/repl_settings_gen.h"
 #include "mongo/util/log.h"
 
 namespace mongo {
 namespace repl {
-namespace {
-
-// Tells the server to perform replication recovery as a standalone.
-constexpr bool recoverFromOplogAsStandaloneDefault = false;
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(recoverFromOplogAsStandalone,
-                                      bool,
-                                      recoverFromOplogAsStandaloneDefault);
-}  // namespace
+
 
 std::string ReplSettings::ourSetName() const {
     size_t sl = _replSetString.find('/');
diff --git a/src/mongo/db/repl/repl_settings.h b/src/mongo/db/repl/repl_settings.h
index 9423ce6185d..e75264cb5be 100644
--- a/src/mongo/db/repl/repl_settings.h
+++ b/src/mongo/db/repl/repl_settings.h
@@ -32,13 +32,12 @@
 #include <string>
 
 #include "mongo/db/jsobj.h"
+#include "mongo/db/repl/repl_set_config_gen.h"
+#include "mongo/db/repl/repl_settings_gen.h"
 
 namespace mongo {
 namespace repl {
 
-extern int maxSyncSourceLagSecs;
-extern double replElectionTimeoutOffsetLimitFraction;
-
 class ReplSettings {
 public:
     std::string ourSetName() const;
diff --git a/src/mongo/db/repl/repl_settings.idl b/src/mongo/db/repl/repl_settings.idl
new file mode 100644
index 00000000000..4e01a00d270
--- /dev/null
+++ b/src/mongo/db/repl/repl_settings.idl
@@ -0,0 +1,61 @@
+# Copyright (C) 2018-present MongoDB, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the Server Side Public License, version 1,
+# as published by MongoDB, Inc.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# Server Side Public License for more details.
+#
+# You should have received a copy of the Server Side Public License
+# along with this program. If not, see
+# <http://www.mongodb.com/licensing/server-side-public-license>.
+#
+# As a special exception, the copyright holders give permission to link the
+# code of portions of this program with the OpenSSL library under certain
+# conditions as described in each individual source file and distribute
+# linked combinations including the program with the OpenSSL library. You
+# must comply with the Server Side Public License in all respects for
+# all of the code used other than as permitted herein. If you modify file(s)
+# with this exception, you may extend this exception to your version of the
+# file(s), but you are not obligated to do so. If you do not wish to do so,
+# delete this exception statement from your version. If you delete this
+# exception statement from all source files in the program, then also delete
+# it in the license file.
+#
+
+# server setParameters for replication
+
+global:
+    cpp_namespace: "mongo::repl"
+
+server_parameters:
+    # From repl_settings.cpp
+    recoverFromOplogAsStandalone:
+        description: Tells the server to perform replication recovery as a standalone.
+        set_at: startup
+        cpp_vartype: bool
+        cpp_varname: recoverFromOplogAsStandalone
+        default: false
+
+    # From repl_settings_init.cpp
+    maxSyncSourceLagSecs:
+        description: ''
+        set_at: startup
+        cpp_vartype: int
+        cpp_varname: maxSyncSourceLagSecs
+        default: 30
+        validator:
+            gt: 0
+
+    replElectionTimeoutOffsetLimitFraction:
+        description: ''
+        set_at: startup
+        cpp_vartype: double
+        cpp_varname: replElectionTimeoutOffsetLimitFraction
+        default: 0.15
+        validator:
+            gt: 0.01
+
diff --git a/src/mongo/db/repl/repl_settings_init.cpp b/src/mongo/db/repl/repl_settings_init.cpp
deleted file mode 100644
index 66793563f85..00000000000
--- a/src/mongo/db/repl/repl_settings_init.cpp
+++ /dev/null
@@ -1,52 +0,0 @@
-/**
- *    Copyright (C) 2018-present MongoDB, Inc.
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the Server Side Public License, version 1,
- *    as published by MongoDB, Inc.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    Server Side Public License for more details.
- *
- *    You should have received a copy of the Server Side Public License
- *    along with this program. If not, see
- *    <http://www.mongodb.com/licensing/server-side-public-license>.
- *
- *    As a special exception, the copyright holders give permission to link the
- *    code of portions of this program with the OpenSSL library under certain
- *    conditions as described in each individual source file and distribute
- *    linked combinations including the program with the OpenSSL library. You
- *    must comply with the Server Side Public License in all respects for
- *    all of the code used other than as permitted herein. If you modify file(s)
- *    with this exception, you may extend this exception to your version of the
- *    file(s), but you are not obligated to do so. If you do not wish to do so,
- *    delete this exception statement from your version. If you delete this
- *    exception statement from all source files in the program, then also delete
- *    it in the license file.
- */
-
-#include "mongo/db/repl/repl_settings.h"
-
-#include "mongo/base/init.h"
-#include "mongo/base/status.h"
-#include "mongo/db/server_parameters.h"
-
-namespace mongo {
-namespace repl {
-
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(maxSyncSourceLagSecs, int, 30);
-MONGO_EXPORT_STARTUP_SERVER_PARAMETER(replElectionTimeoutOffsetLimitFraction, double, 0.15);
-
-MONGO_INITIALIZER(replSettingsCheck)(InitializerContext*) {
-    if (maxSyncSourceLagSecs < 1) {
-        return Status(ErrorCodes::BadValue, "maxSyncSourceLagSecs must be > 0");
-    }
-    if (replElectionTimeoutOffsetLimitFraction <= 0.01) {
-        return Status(ErrorCodes::BadValue, "electionTimeoutOffsetLimitFraction must be > 0.01");
-    }
-    return Status::OK();
-}
-}
-}
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 2ce1ae9e438..dba73cf46cd 100644
--- a/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp
+++ b/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp
@@ -66,6 +66,7 @@
 #include "mongo/db/repl/oplog.h"
 #include "mongo/db/repl/oplog_applier_impl.h"
 #include "mongo/db/repl/oplog_buffer_blocking_queue.h"
+#include "mongo/db/repl/repl_server_parameters_gen.h"
 #include "mongo/db/repl/repl_settings.h"
 #include "mongo/db/repl/replication_coordinator.h"
 #include "mongo/db/repl/replication_process.h"
@@ -78,7 +79,6 @@
 #include "mongo/db/s/sharding_state_recovery.h"
 #include "mongo/db/s/transaction_coordinator_service.h"
 #include "mongo/db/server_options.h"
-#include "mongo/db/server_parameters.h"
 #include "mongo/db/service_context.h"
 #include "mongo/db/session_catalog_mongod.h"
 #include "mongo/db/storage/storage_engine.h"
@@ -125,29 +125,6 @@ const char tsFieldName[] = "ts";
 
 MONGO_FAIL_POINT_DEFINE(dropPendingCollectionReaperHang);
 
-// Set this to specify the maximum number of times the oplog fetcher will consecutively restart the
-// oplog tailing query on non-cancellation errors during steady state replication.
-MONGO_EXPORT_SERVER_PARAMETER(oplogFetcherSteadyStateMaxFetcherRestarts, int, 1)
-    ->withValidator([](const int& potentialNewValue) {
-        if (potentialNewValue < 0) {
-            return Status(ErrorCodes::BadValue,
-                          "oplogFetcherSteadyStateMaxFetcherRestarts must be nonnegative");
-        }
-        return Status::OK();
-    });
-
-// Set this to specify the maximum number of times the oplog fetcher will consecutively restart the
-// oplog tailing query on non-cancellation errors during initial sync. By default we provide a
-// generous amount of restarts to avoid potentially restarting an entire initial sync from scratch.
-MONGO_EXPORT_SERVER_PARAMETER(oplogFetcherInitialSyncMaxFetcherRestarts, int, 10)
-    ->withValidator([](const int& potentialNewValue) {
-        if (potentialNewValue < 0) {
-            return Status(ErrorCodes::BadValue,
-                          "oplogFetcherInitialSyncMaxFetcherRestarts must be nonnegative");
-        }
-        return Status::OK();
-    });
-
 // The count of items in the buffer
 OplogBuffer::Counters bufferGauge;
 ServerStatusMetricField<Counter64> displayBufferCount("repl.buffer.count", &bufferGauge.count);