mirror of
https://github.com/ceph/ceph
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110 lines
2.2 KiB
C
110 lines
2.2 KiB
C
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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
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/*
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* Ceph - scalable distributed file system
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*
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* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
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*
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* This is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software
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* Foundation. See file COPYING.
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*
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*/
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#ifndef __MDBALANCER_H
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#define __MDBALANCER_H
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#include <ostream>
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#include <list>
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using namespace std;
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#include <map>
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#include <ext/hash_map>
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using namespace __gnu_cxx;
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#include "include/types.h"
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#include "common/Clock.h"
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#include "CInode.h"
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class MDS;
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class Message;
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class MHeartbeat;
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class CInode;
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class Context;
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class CDir;
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class MDBalancer {
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protected:
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MDS *mds;
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int beat_epoch;
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utime_t last_heartbeat;
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utime_t last_hash;
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// todo
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set<inodeno_t> hash_queue;
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// per-epoch scatter/gathered info
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hash_map<int, mds_load_t> mds_load;
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hash_map<int, float> mds_meta_load;
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map<int, map<int, float> > mds_import_map;
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// per-epoch state
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double my_load, target_load;
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map<int,double> my_targets;
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map<int,double> imported;
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map<int,double> exported;
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double try_match(int ex, double& maxex,
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int im, double& maxim);
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double get_maxim(int im) {
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return target_load - mds_meta_load[im] - imported[im];
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}
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double get_maxex(int ex) {
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return mds_meta_load[ex] - target_load - exported[ex];
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}
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public:
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MDBalancer(MDS *m) :
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mds(m),
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beat_epoch(0) { }
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mds_load_t get_load();
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int proc_message(Message *m);
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void send_heartbeat();
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void handle_heartbeat(MHeartbeat *m);
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void tick();
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void do_hashing();
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void export_empties();
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void do_rebalance(int beat);
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void find_exports(CDir *dir,
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double amount,
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list<CDir*>& exports,
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double& have,
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set<CDir*>& already_exporting);
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void subtract_export(class CDir *ex);
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void add_import(class CDir *im);
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void hit_inode(class CInode *in, int type=0);
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void hit_dir(class CDir *dir, int type=0);
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void hit_recursive(class CDir *dir, int type=0);
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void show_imports(bool external=false);
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};
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#endif
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