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// balance.h
/**
* Copyright (C) 2008 10gen 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/>.
*/
#pragma once
#include "../pch.h"
#include "../util/background.h"
#include "../client/dbclient.h"
#include "balancer_policy.h"
namespace mongo {
class Balancer : public BackgroundJob {
public:
Balancer();
virtual ~Balancer();
// BackgroundJob methods
virtual void run();
virtual string name() { return "Balancer"; }
private:
typedef BalancerPolicy::ChunkInfo CandidateChunk;
typedef shared_ptr<CandidateChunk> CandidateChunkPtr;
/**
* Gathers all the necessary information about shards and chunks, and
* decides whether there are candidate chunks to be moved.
*/
void _doBalanceRound( DBClientBase& conn, vector<CandidateChunkPtr>* candidateChunks );
/**
* Execute the chunk migrations described in 'candidateChunks' and
* returns the number of chunks effectively moved.
*/
int _moveChunks( const vector<CandidateChunkPtr>* candidateChunks );
/**
* Check the health of the master configuration server
*/
void _ping();
void _ping( DBClientBase& conn );
/**
* @return true if everything is ok
*/
bool _checkOIDs();
// internal state
string _myid; // hostname:port of my mongos
time_t _started; // time Balancer starte running
int _balancedLastTime; // number of moved chunks in last round
BalancerPolicy* _policy; // decide which chunks to move; owned here.
// non-copyable, non-assignable
Balancer(const Balancer&);
Balancer operator=(const Balancer&);
};
extern Balancer balancer;
}
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