SERVER-34145 Create flushDatabaseCacheUpdates internal command

1 files changed, 154 insertions, 0 deletions

diff --git a/src/mongo/db/s/flush_database_cache_updates_command.cpp b/src/mongo/db/s/flush_database_cache_updates_command.cpp
new file mode 100644
index 00000000000..deae485cca9
--- /dev/null
+++ b/src/mongo/db/s/flush_database_cache_updates_command.cpp
@@ -0,0 +1,154 @@
+/**
+ *    Copyright (C) 2018 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::kSharding
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/auth/action_set.h"
+#include "mongo/db/auth/action_type.h"
+#include "mongo/db/auth/authorization_manager.h"
+#include "mongo/db/auth/authorization_session.h"
+#include "mongo/db/auth/privilege.h"
+#include "mongo/db/catalog_raii.h"
+#include "mongo/db/client.h"
+#include "mongo/db/commands.h"
+#include "mongo/db/operation_context.h"
+#include "mongo/db/repl/repl_client_info.h"
+#include "mongo/db/s/database_sharding_state.h"
+#include "mongo/db/s/migration_source_manager.h"
+#include "mongo/db/s/operation_sharding_state.h"
+#include "mongo/db/s/shard_filtering_metadata_refresh.h"
+#include "mongo/db/s/sharding_state.h"
+#include "mongo/s/catalog_cache_loader.h"
+#include "mongo/s/grid.h"
+#include "mongo/s/request_types/flush_database_cache_updates_gen.h"
+
+
+#include "mongo/util/log.h"
+
+namespace mongo {
+namespace {
+
+class FlushDatabaseCacheUpdates : public BasicCommand {
+public:
+    FlushDatabaseCacheUpdates() : BasicCommand("_flushDatabaseCacheUpdates") {}
+
+    std::string help() const override {
+        return "Internal command which waits for any pending routing table cache updates for a "
+               "particular database to be written locally. The operationTime returned in the "
+               "response metadata is guaranteed to be at least as late as the last routing table "
+               "cache update to the local disk. Takes a 'forceRemoteRefresh' option to make this "
+               "node refresh its cache from the config server before waiting for the last refresh "
+               "to be persisted.";
+    }
+
+    bool adminOnly() const override {
+        return true;
+    }
+
+    AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
+        return AllowedOnSecondary::kNever;
+    }
+
+    bool supportsWriteConcern(const BSONObj& cmd) const override {
+        return false;
+    }
+
+    Status checkAuthForCommand(Client* client,
+                               const std::string& dbname,
+                               const BSONObj& cmdObj) const override {
+        if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
+                ResourcePattern::forClusterResource(), ActionType::internal)) {
+            return Status(ErrorCodes::Unauthorized, "Unauthorized");
+        }
+        return Status::OK();
+    }
+
+    void addRequiredPrivileges(const std::string& dbname,
+                               const BSONObj& cmdObj,
+                               std::vector<Privilege>* out) const override {
+        ActionSet actions;
+        actions.addAction(ActionType::internal);
+        out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
+    }
+
+    bool run(OperationContext* opCtx,
+             const std::string& dbname,
+             const BSONObj& cmdObj,
+             BSONObjBuilder& result) override {
+        auto const shardingState = ShardingState::get(opCtx);
+        uassertStatusOK(shardingState->canAcceptShardedCommands());
+
+        uassert(ErrorCodes::IllegalOperation,
+                "Can't issue _flushDatabaseCacheUpdates from 'eval'",
+                !opCtx->getClient()->isInDirectClient());
+
+        uassert(ErrorCodes::IllegalOperation,
+                "Can't call _flushDatabaseCacheUpdates if in read-only mode",
+                !storageGlobalParams.readOnly);
+
+        auto& oss = OperationShardingState::get(opCtx);
+
+        const auto request = _flushDatabaseCacheUpdatesRequest::parse(
+            IDLParserErrorContext("_FlushDatabaseCacheUpdatesRequest"), cmdObj);
+        auto name = request.getCommandParameter().toString();
+
+        {
+            AutoGetDb autoDb(opCtx, name, MODE_IS);
+
+            // If the primary is in the critical section, secondaries must wait for the commit to
+            // finish on the primary in case a secondary's caller has an afterClusterTime inclusive
+            // of the commit (and new writes to the committed chunk) that hasn't yet propagated back
+            // to this shard. This ensures the read your own writes causal consistency guarantee.
+            auto criticalSectionSignal =
+                DatabaseShardingState::get(autoDb.getDb())
+                    .getCriticalSectionSignal(ShardingMigrationCriticalSection::kRead);
+            if (criticalSectionSignal) {
+                oss.setMigrationCriticalSectionSignal(criticalSectionSignal);
+            }
+        }
+
+        oss.waitForMigrationCriticalSectionSignal(opCtx);
+
+        if (request.getSyncFromConfig()) {
+            LOG(1) << "Forcing remote routing table refresh for " << name;
+            forceDatabaseRefresh(opCtx, name);
+        }
+
+        CatalogCacheLoader::get(opCtx).waitForDatabaseFlush(opCtx, name);
+
+        repl::ReplClientInfo::forClient(opCtx->getClient()).setLastOpToSystemLastOpTime(opCtx);
+
+        return true;
+    }
+
+} _flushDatabaseCacheUpdatesCmd;
+
+}  // namespace
+}  // namespace mongo