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76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
// balance.h
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "../pch.h"
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#include "../util/background.h"
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#include "../client/dbclient.h"
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#include "balancer_policy.h"
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namespace mongo {
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class Balancer : public BackgroundJob {
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public:
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Balancer();
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virtual ~Balancer();
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// BackgroundJob methods
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virtual void run();
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virtual string name() const { return "Balancer"; }
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private:
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typedef BalancerPolicy::ChunkInfo CandidateChunk;
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typedef shared_ptr<CandidateChunk> CandidateChunkPtr;
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/**
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* Gathers all the necessary information about shards and chunks, and
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* decides whether there are candidate chunks to be moved.
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*/
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void _doBalanceRound( DBClientBase& conn, vector<CandidateChunkPtr>* candidateChunks );
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/**
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* Execute the chunk migrations described in 'candidateChunks' and
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* returns the number of chunks effectively moved.
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*/
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int _moveChunks( const vector<CandidateChunkPtr>* candidateChunks );
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/**
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* Check the health of the master configuration server
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*/
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void _ping();
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void _ping( DBClientBase& conn );
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/**
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* @return true if everything is ok
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*/
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bool _checkOIDs();
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// internal state
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string _myid; // hostname:port of my mongos
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time_t _started; // time Balancer starte running
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int _balancedLastTime; // number of moved chunks in last round
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BalancerPolicy* _policy; // decide which chunks to move; owned here.
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};
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extern Balancer balancer;
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}
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