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/**
* Copyright (C) 2016 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/base/status_with.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/read_concern_args.h"
#include "mongo/db/s/chunk_move_write_concern_options.h"
#include "mongo/db/s/config/sharding_catalog_manager.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/s/catalog/type_locks.h"
#include "mongo/s/chunk_version.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/commit_chunk_migration_request_type.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
/**
* This command takes the chunk being migrated ("migratedChunk") and generates a new version for it
* that is written along with its new shard location ("toShard") to the chunks collection.
*
* The new chunk version is generated by querying the highest chunk version of the collection, and
* then incrementing that major value for migrated chunks and setting the minor to
* 0 for the migrated chunk. A global exclusive lock is held for the
* duration of generating the new chunk version and writing to the chunks collection so that
* yielding cannot occur. This assures that generated ChunkVersions are strictly monotonically
* increasing -- a second process will not be able to query for max chunk version until the first
* finishes writing the new highest chunk version it generated.
*
* Command Format:
* {
* _configsvrCommitChunkMigration: <database>.<collection>,
* fromShard: "<from_shard_name>",
* toShard: "<to_shard_name>",
* migratedChunk: {min: <min_value>, max: <max_value>, etc. },
* fromShardCollectionVersion: { shardVersionField: <version> }, (for backward compatibility only)
* }
*
* Returns:
* {
* migratedChunkVersion: <ChunkVersion_BSON>,
* }
*
*/
class ConfigSvrCommitChunkMigrationCommand : public BasicCommand {
public:
ConfigSvrCommitChunkMigrationCommand() : BasicCommand("_configsvrCommitChunkMigration") {}
std::string help() const override {
return "should not be calling this directly";
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
bool adminOnly() const override {
return true;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
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();
}
std::string parseNs(const std::string& dbname, const BSONObj& cmdObj) const override {
return CommandHelpers::parseNsFullyQualified(cmdObj);
}
bool run(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& cmdObj,
BSONObjBuilder& result) override {
// Set the operation context read concern level to local for reads into the config database.
repl::ReadConcernArgs::get(opCtx) =
repl::ReadConcernArgs(repl::ReadConcernLevel::kLocalReadConcern);
const NamespaceString nss = NamespaceString(parseNs(dbName, cmdObj));
auto commitRequest =
uassertStatusOK(CommitChunkMigrationRequest::createFromCommand(nss, cmdObj));
StatusWith<BSONObj> response = ShardingCatalogManager::get(opCtx)->commitChunkMigration(
opCtx,
nss,
commitRequest.getMigratedChunk(),
commitRequest.getCollectionEpoch(),
commitRequest.getFromShard(),
commitRequest.getToShard(),
commitRequest.getValidAfter());
uassertStatusOK(response.getStatus());
result.appendElements(response.getValue());
return true;
}
} configsvrCommitChunkMigrationCommand;
} // namespace
} // namespace mongo
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