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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 <string>
#include "mongo/client/connection_string.h"
#include "mongo/db/namespace_string.h"
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/s/chunk_version.h"
#include "mongo/s/migration_secondary_throttle_options.h"
namespace mongo {
class BSONObjBuilder;
template <typename T>
class StatusWith;
/**
* Parses the arguments for a move chunk operation.
*/
class MoveChunkRequest {
public:
/**
* Parses the input command and produces a request corresponding to its arguments. The parsing
* ignores arguments, which are processed at the command level, in particular shardVersion and
* maxTimeMS.
*/
static StatusWith<MoveChunkRequest> createFromCommand(NamespaceString nss, const BSONObj& obj);
/**
* Constructs a moveChunk command with the specified parameters and writes it to the builder,
* without closing the builder. The builder must be empty, but callers are free to append more
* fields once the command has been constructed.
*
* The chunkVersion argument is appended as 'chunkVersion', but not parsed by the
* createFromCommand method above, because it is needed for backwards compatibility with 3.4.
* However, the 'epoch' field created from the chunkVersion argument is parsed.
*/
static void appendAsCommand(BSONObjBuilder* builder,
const NamespaceString& nss,
ChunkVersion chunkVersion,
const ConnectionString& configServerConnectionString,
const ShardId& fromShardId,
const ShardId& toShardId,
const ChunkRange& range,
int64_t maxChunkSizeBytes,
const MigrationSecondaryThrottleOptions& secondaryThrottle,
bool waitForDelete);
const NamespaceString& getNss() const {
return _nss;
}
const ShardId& getFromShardId() const {
return _fromShardId;
}
const ShardId& getToShardId() const {
return _toShardId;
}
const BSONObj& getMinKey() const {
return _range.getMin();
}
const BSONObj& getMaxKey() const {
return _range.getMax();
}
const OID getVersionEpoch() const {
return _versionEpoch;
}
int64_t getMaxChunkSizeBytes() const {
return _maxChunkSizeBytes;
}
const MigrationSecondaryThrottleOptions& getSecondaryThrottle() const {
return _secondaryThrottle;
}
bool getWaitForDelete() const {
return _waitForDelete;
}
/**
* Returns true if the requests match exactly in terms of the field values and the order of
* elements within the BSON-typed fields.
*/
bool operator==(const MoveChunkRequest& other) const;
bool operator!=(const MoveChunkRequest& other) const;
/**
* Print logging info for the request.
*/
std::string toString() const;
private:
MoveChunkRequest(NamespaceString nss,
ChunkRange range,
MigrationSecondaryThrottleOptions secondaryThrottle);
// The collection for which this request applies
NamespaceString _nss;
// The source shard id
ShardId _fromShardId;
// The recipient shard id
ShardId _toShardId;
// Range of the chunk being moved
ChunkRange _range;
// Assures the collection has not been dropped and recreated since the moveChunk was sent.
OID _versionEpoch;
// 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{0};
// 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;
};
} // namespace mongo
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