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/**
* 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/client/remote_command_targeter.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/s/active_migrations_registry.h"
#include "mongo/db/s/chunk_move_write_concern_options.h"
#include "mongo/db/s/migration_source_manager.h"
#include "mongo/db/s/move_timing_helper.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/migration_secondary_throttle_options.h"
#include "mongo/s/request_types/move_chunk_request.h"
#include "mongo/util/concurrency/notification.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
/**
* If the specified status is not OK logs a warning and throws a DBException corresponding to the
* specified status.
*/
void uassertStatusOKWithWarning(const Status& status) {
if (!status.isOK()) {
warning() << "Chunk move failed" << causedBy(redact(status));
uassertStatusOK(status);
}
}
const WriteConcernOptions kMajorityWriteConcern(WriteConcernOptions::kMajority,
// Note: Even though we're setting UNSET here,
// kMajority implies JOURNAL if journaling is
// supported by mongod and
// writeConcernMajorityJournalDefault is set to true
// in the ReplSetConfig.
WriteConcernOptions::SyncMode::UNSET,
-1);
// Tests can pause and resume moveChunk's progress at each step by enabling/disabling each failpoint
MONGO_FAIL_POINT_DEFINE(moveChunkHangAtStep1);
MONGO_FAIL_POINT_DEFINE(moveChunkHangAtStep2);
MONGO_FAIL_POINT_DEFINE(moveChunkHangAtStep3);
MONGO_FAIL_POINT_DEFINE(moveChunkHangAtStep4);
MONGO_FAIL_POINT_DEFINE(moveChunkHangAtStep5);
MONGO_FAIL_POINT_DEFINE(moveChunkHangAtStep6);
MONGO_FAIL_POINT_DEFINE(moveChunkHangAtStep7);
class MoveChunkCommand : public BasicCommand {
public:
MoveChunkCommand() : BasicCommand("moveChunk") {}
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;
}
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 {
auto shardingState = ShardingState::get(opCtx);
uassertStatusOK(shardingState->canAcceptShardedCommands());
const MoveChunkRequest moveChunkRequest = uassertStatusOK(
MoveChunkRequest::createFromCommand(NamespaceString(parseNs(dbname, cmdObj)), cmdObj));
// Make sure we're as up-to-date as possible with shard information. This catches the case
// where we might have changed a shard's host by removing/adding a shard with the same name.
Grid::get(opCtx)->shardRegistry()->reload(opCtx);
auto scopedMigration = uassertStatusOK(
ActiveMigrationsRegistry::get(opCtx).registerDonateChunk(moveChunkRequest));
Status status = {ErrorCodes::InternalError, "Uninitialized value"};
// Check if there is an existing migration running and if so, join it
if (scopedMigration.mustExecute()) {
try {
_runImpl(opCtx, moveChunkRequest);
status = Status::OK();
} catch (const DBException& e) {
status = e.toStatus();
} catch (const std::exception& e) {
scopedMigration.signalComplete(
{ErrorCodes::InternalError,
str::stream() << "Severe error occurred while running moveChunk command: "
<< e.what()});
throw;
}
scopedMigration.signalComplete(status);
} else {
status = scopedMigration.waitForCompletion(opCtx);
}
uassertStatusOK(status);
if (moveChunkRequest.getWaitForDelete()) {
// Ensure we capture the latest opTime in the system, since range deletion happens
// asynchronously with a different OperationContext. This must be done after the above
// join, because each caller must set the opTime to wait for writeConcern for on its own
// OperationContext.
// TODO (SERVER-30183): If this moveChunk joined an active moveChunk that did not have
// waitForDelete=true, the captured opTime may not reflect all the deletes.
auto& replClient = repl::ReplClientInfo::forClient(opCtx->getClient());
replClient.setLastOpToSystemLastOpTime(opCtx);
WriteConcernResult writeConcernResult;
writeConcernResult.wTimedOut = false;
Status majorityStatus = waitForWriteConcern(
opCtx, replClient.getLastOp(), kMajorityWriteConcern, &writeConcernResult);
if (!majorityStatus.isOK()) {
if (!writeConcernResult.wTimedOut) {
uassertStatusOK(majorityStatus);
}
return false;
}
}
return true;
}
private:
static void _runImpl(OperationContext* opCtx, const MoveChunkRequest& moveChunkRequest) {
const auto writeConcernForRangeDeleter =
uassertStatusOK(ChunkMoveWriteConcernOptions::getEffectiveWriteConcern(
opCtx, moveChunkRequest.getSecondaryThrottle()));
// Resolve the donor and recipient shards and their connection string
auto const shardRegistry = Grid::get(opCtx)->shardRegistry();
const auto donorConnStr =
uassertStatusOK(shardRegistry->getShard(opCtx, moveChunkRequest.getFromShardId()))
->getConnString();
const auto recipientHost = uassertStatusOK([&] {
auto recipientShard =
uassertStatusOK(shardRegistry->getShard(opCtx, moveChunkRequest.getToShardId()));
return recipientShard->getTargeter()->findHost(
opCtx, ReadPreferenceSetting{ReadPreference::PrimaryOnly});
}());
std::string unusedErrMsg;
MoveTimingHelper moveTimingHelper(opCtx,
"from",
moveChunkRequest.getNss().ns(),
moveChunkRequest.getMinKey(),
moveChunkRequest.getMaxKey(),
6, // Total number of steps
&unusedErrMsg,
moveChunkRequest.getToShardId(),
moveChunkRequest.getFromShardId());
moveTimingHelper.done(1);
MONGO_FAIL_POINT_PAUSE_WHILE_SET(moveChunkHangAtStep1);
MigrationSourceManager migrationSourceManager(
opCtx, moveChunkRequest, donorConnStr, recipientHost);
moveTimingHelper.done(2);
MONGO_FAIL_POINT_PAUSE_WHILE_SET(moveChunkHangAtStep2);
uassertStatusOKWithWarning(migrationSourceManager.startClone(opCtx));
moveTimingHelper.done(3);
MONGO_FAIL_POINT_PAUSE_WHILE_SET(moveChunkHangAtStep3);
uassertStatusOKWithWarning(migrationSourceManager.awaitToCatchUp(opCtx));
moveTimingHelper.done(4);
MONGO_FAIL_POINT_PAUSE_WHILE_SET(moveChunkHangAtStep4);
uassertStatusOKWithWarning(migrationSourceManager.enterCriticalSection(opCtx));
uassertStatusOKWithWarning(migrationSourceManager.commitChunkOnRecipient(opCtx));
moveTimingHelper.done(5);
MONGO_FAIL_POINT_PAUSE_WHILE_SET(moveChunkHangAtStep5);
uassertStatusOKWithWarning(migrationSourceManager.commitChunkMetadataOnConfig(opCtx));
moveTimingHelper.done(6);
MONGO_FAIL_POINT_PAUSE_WHILE_SET(moveChunkHangAtStep6);
}
} moveChunkCmd;
} // namespace
} // namespace mongo
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