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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 <map>
#include <string>
#include "mongo/bson/timestamp.h"
#include "mongo/client/connection_string.h"
#include "mongo/db/repl/optime.h"
#include "mongo/s/ns_targeter.h"
#include "mongo/s/write_ops/batched_command_request.h"
#include "mongo/s/write_ops/batched_command_response.h"
namespace mongo {
class BatchWriteExecStats;
class OperationContext;
/**
* The BatchWriteExec is able to execute client batch write requests, resulting in a batch
* response to send back to the client.
*
* There are two main interfaces the exec uses to "run" the batch:
*
* - the "targeter" used to generate child batch operations to send to particular shards
*
* - the "dispatcher" used to send child batches to several shards at once, and retrieve the
* results
*
* Both the targeter and dispatcher are assumed to be dedicated to this particular
* BatchWriteExec instance.
*
*/
class BatchWriteExec {
public:
/**
* Executes a client batch write request by sending child batches to several shard
* endpoints, and returns a client batch write response.
*
* This function does not throw, any errors are reported via the clientResponse.
*/
static void executeBatch(OperationContext* opCtx,
NSTargeter& targeter,
const BatchedCommandRequest& clientRequest,
BatchedCommandResponse* clientResponse,
BatchWriteExecStats* stats);
};
struct HostOpTime {
HostOpTime(repl::OpTime ot, OID e) : opTime(ot), electionId(e){};
HostOpTime(){};
repl::OpTime opTime;
OID electionId;
};
typedef std::map<ConnectionString, HostOpTime> HostOpTimeMap;
class BatchWriteExecStats {
public:
BatchWriteExecStats()
: numRounds(0), numTargetErrors(0), numResolveErrors(0), numStaleBatches(0) {}
void noteWriteAt(const HostAndPort& host, repl::OpTime opTime, const OID& electionId);
void noteTargetedShard(const ShardId& shardId);
const std::set<ShardId>& getTargetedShards() const;
const HostOpTimeMap& getWriteOpTimes() const;
// Expose via helpers if this gets more complex
// Number of round trips required for the batch
int numRounds;
// Number of times targeting failed
int numTargetErrors;
// Number of times host resolution failed
int numResolveErrors;
// Number of stale batches
int numStaleBatches;
private:
std::set<ShardId> _targetedShards;
HostOpTimeMap _writeOpTimes;
};
} // namespace mongo
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