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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.
*/
#pragma once
#include <boost/optional.hpp>
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/s/client/shard.h"
#include "mongo/s/request_types/migration_secondary_throttle_options.h"
namespace mongo {
class BSONObj;
template <typename T>
class StatusWith;
/**
* Provides support for parsing and serialization of arguments to the config server moveChunk
* command, which controls the cluster balancer. If any changes are made to this class, they need to
* be backwards compatible with older versions of the server.
*/
class BalanceChunkRequest {
public:
/**
* Parses the provided BSON content and if it is correct construct a request object with the
* request parameters. If the '_id' field is missing in obj, ignore it.
*/
static StatusWith<BalanceChunkRequest> parseFromConfigCommand(const BSONObj& obj);
/**
* Produces a BSON object for the variant of the command, which requests the balancer to move a
* chunk to a user-specified shard.
*/
static BSONObj serializeToMoveCommandForConfig(
const ChunkType& chunk,
const ShardId& newShardId,
int64_t maxChunkSizeBytes,
const MigrationSecondaryThrottleOptions& secondaryThrottle,
bool waitForDelete,
bool forceJumbo);
/**
* Produces a BSON object for the variant of the command, which requests the balancer to pick a
* better location for a chunk.
*/
static BSONObj serializeToRebalanceCommandForConfig(const ChunkType& chunk);
// an pre 5.1 mongos might send the namespace instead of the UUID
const boost::optional<NamespaceString>& getNss() const {
return _nss;
}
void setCollectionUUID(UUID const& uuid) {
_chunk.setCollectionUUID(uuid);
}
const ChunkType& getChunk() const {
return _chunk;
}
bool hasToShardId() const {
return _toShardId.is_initialized();
}
const ShardId& getToShardId() const {
return *_toShardId;
}
int64_t getMaxChunkSizeBytes() const {
return _maxChunkSizeBytes;
}
const MigrationSecondaryThrottleOptions& getSecondaryThrottle() const {
return _secondaryThrottle;
}
bool getWaitForDelete() const {
return _waitForDelete;
}
bool getForceJumbo() const {
return _forceJumbo;
}
private:
BalanceChunkRequest(ChunkType chunk, MigrationSecondaryThrottleOptions secondaryThrottle);
// legacy code might send the namespace instead of UUID
boost::optional<NamespaceString> _nss;
// Complete description of the chunk to be manipulated
ChunkType _chunk;
// Id of the shard to which it should be moved (if specified)
boost::optional<ShardId> _toShardId;
// This value is used by the migration source to determine the data size threshold above which a
// chunk would be considered jumbo and migrations will not proceed.
int64_t _maxChunkSizeBytes;
// The parsed secondary throttle options
MigrationSecondaryThrottleOptions _secondaryThrottle;
// Whether to block and wait for the range deleter to cleanup the orphaned documents at the end
// of move.
bool _waitForDelete;
bool _forceJumbo;
};
} // namespace mongo
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