SERVER-53861: Implement stop migrations procedure for DDL operations

1 files changed, 103 insertions, 0 deletions

diff --git a/src/mongo/db/s/sharding_util.cpp b/src/mongo/db/s/sharding_util.cpp
new file mode 100644
index 00000000000..7f0d5080bdb
--- /dev/null
+++ b/src/mongo/db/s/sharding_util.cpp
@@ -0,0 +1,103 @@
+/**
+ *    Copyright (C) 2021-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_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/s/sharding_util.h"
+
+#include "mongo/db/commands.h"
+#include "mongo/logv2/log.h"
+#include "mongo/s/async_requests_sender.h"
+#include "mongo/s/request_types/flush_routing_table_cache_updates_gen.h"
+
+namespace mongo {
+
+namespace sharding_util {
+
+void tellShardsToRefreshCollection(OperationContext* opCtx,
+                                   const std::vector<ShardId>& shardIds,
+                                   const NamespaceString& nss,
+                                   const std::shared_ptr<executor::TaskExecutor>& executor) {
+    auto cmd = _flushRoutingTableCacheUpdatesWithWriteConcern(nss);
+    cmd.setSyncFromConfig(true);
+    cmd.setDbName(nss.db());
+    auto cmdObj = CommandHelpers::appendMajorityWriteConcern(cmd.toBSON({}));
+
+    sendCommandToShards(opCtx, cmdObj, shardIds, nss, executor);
+}
+
+void sendCommandToShards(OperationContext* opCtx,
+                         const BSONObj& command,
+                         const std::vector<ShardId>& shardIds,
+                         const NamespaceString& nss,
+                         const std::shared_ptr<executor::TaskExecutor>& executor) {
+    std::vector<AsyncRequestsSender::Request> requests;
+    for (const auto& shardId : shardIds) {
+        requests.emplace_back(shardId, command);
+    }
+
+    if (!requests.empty()) {
+        // The _flushRoutingTableCacheUpdatesWithWriteConcern command will fail with a
+        // QueryPlanKilled error response if the config.cache.chunks collection is dropped
+        // concurrently. The config.cache.chunks collection is dropped by the shard when it detects
+        // the sharded collection's epoch having changed. We use kIdempotentOrCursorInvalidated so
+        // the ARS automatically retries in that situation.
+        AsyncRequestsSender ars(opCtx,
+                                executor,
+                                "admin",
+                                requests,
+                                ReadPreferenceSetting(ReadPreference::PrimaryOnly),
+                                Shard::RetryPolicy::kIdempotentOrCursorInvalidated);
+
+        while (!ars.done()) {
+            // Retrieve the responses and throw at the first failure.
+            auto response = ars.next();
+
+            auto generateErrorContext = [&]() -> std::string {
+                return str::stream()
+                    << "Unable to _flushRoutingTableCacheUpdatesWithWriteConcern for namespace "
+                    << nss.ns() << " on " << response.shardId;
+            };
+
+            auto shardResponse =
+                uassertStatusOKWithContext(std::move(response.swResponse), generateErrorContext());
+
+            auto status = getStatusFromCommandResult(shardResponse.data);
+            uassertStatusOKWithContext(status, generateErrorContext());
+
+            auto wcStatus = getWriteConcernStatusFromCommandResult(shardResponse.data);
+            uassertStatusOKWithContext(wcStatus, generateErrorContext());
+        }
+    }
+}
+
+}  // namespace sharding_util
+}  // namespace mongo