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ceph/branches/sage/pgs/mds/MDBalancer.cc
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git-svn-id: https://ceph.svn.sf.net/svnroot/ceph@1138 29311d96-e01e-0410-9327-a35deaab8ce9
2007-02-28 18:42:55 +00:00

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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "mdstypes.h"
#include "MDBalancer.h"
#include "MDS.h"
#include "MDSMap.h"
#include "CInode.h"
#include "CDir.h"
#include "MDCache.h"
#include "Migrator.h"
#include "include/Context.h"
#include "msg/Messenger.h"
#include "messages/MHeartbeat.h"
#include <vector>
#include <map>
using namespace std;
#include "config.h"
#undef dout
#define dout(l) if (l<=g_conf.debug_mds || l<=g_conf.debug_mds_balancer) cout << g_clock.now() << " mds" << mds->get_nodeid() << ".bal "
#define MIN_LOAD 50 // ??
#define MIN_REEXPORT 5 // will automatically reexport
#define MIN_OFFLOAD 10 // point at which i stop trying, close enough
int MDBalancer::proc_message(Message *m)
{
switch (m->get_type()) {
case MSG_MDS_HEARTBEAT:
handle_heartbeat((MHeartbeat*)m);
break;
default:
dout(1) << " balancer unknown message " << m->get_type() << endl;
assert(0);
break;
}
return 0;
}
void MDBalancer::tick()
{
static int num_bal_times = g_conf.mds_bal_max;
static utime_t first = g_clock.now();
utime_t now = g_clock.now();
utime_t elapsed = now;
elapsed -= first;
// balance?
if (true &&
mds->get_nodeid() == 0 &&
(num_bal_times ||
(g_conf.mds_bal_max_until >= 0 &&
elapsed.sec() > g_conf.mds_bal_max_until)) &&
mds->is_active() &&
now.sec() - last_heartbeat.sec() >= g_conf.mds_bal_interval) {
last_heartbeat = now;
send_heartbeat();
num_bal_times--;
}
// hash?
if (true &&
g_conf.num_mds > 1 &&
now.sec() - last_hash.sec() > g_conf.mds_bal_hash_interval) {
last_hash = now;
do_hashing();
}
}
class C_Bal_SendHeartbeat : public Context {
public:
MDS *mds;
C_Bal_SendHeartbeat(MDS *mds) {
this->mds = mds;
}
virtual void finish(int f) {
mds->balancer->send_heartbeat();
}
};
mds_load_t MDBalancer::get_load()
{
mds_load_t load;
if (mds->mdcache->get_root())
load.root =
mds->mdcache->get_root()->popularity[MDS_POP_ANYDOM];
// +
// mds->mdcache->get_root()->popularity[MDS_POP_NESTED];
load.req_rate = mds->get_req_rate();
load.queue_len = mds->messenger->get_dispatch_queue_len();
return load;
}
void MDBalancer::send_heartbeat()
{
if (!mds->mdcache->get_root()) {
dout(5) << "no root on send_heartbeat" << endl;
mds->mdcache->open_root(new C_Bal_SendHeartbeat(mds));
return;
}
mds_load.clear();
if (mds->get_nodeid() == 0)
beat_epoch++;
// load
mds_load_t load = get_load();
mds_load[ mds->get_nodeid() ] = load;
// import_map
map<int, float> import_map;
for (set<CDir*>::iterator it = mds->mdcache->imports.begin();
it != mds->mdcache->imports.end();
it++) {
CDir *im = *it;
if (im->inode->is_root()) continue;
int from = im->inode->authority();
import_map[from] += im->popularity[MDS_POP_CURDOM].meta_load();
}
mds_import_map[ mds->get_nodeid() ] = import_map;
dout(5) << "mds" << mds->get_nodeid() << " sending heartbeat " << beat_epoch << " " << load << endl;
for (map<int, float>::iterator it = import_map.begin();
it != import_map.end();
it++) {
dout(5) << " import_map from " << it->first << " -> " << it->second << endl;
}
set<int> up;
mds->get_mds_map()->get_up_mds_set(up);
for (set<int>::iterator p = up.begin(); p != up.end(); ++p) {
if (*p == mds->get_nodeid()) continue;
MHeartbeat *hb = new MHeartbeat(load, beat_epoch);
hb->get_import_map() = import_map;
mds->messenger->send_message(hb,
mds->mdsmap->get_inst(*p),
MDS_PORT_BALANCER, MDS_PORT_BALANCER);
}
}
void MDBalancer::handle_heartbeat(MHeartbeat *m)
{
dout(25) << "=== got heartbeat " << m->get_beat() << " from " << m->get_source().num() << " " << m->get_load() << endl;
if (!mds->mdcache->get_root()) {
dout(10) << "no root on handle" << endl;
mds->mdcache->open_root(new C_MDS_RetryMessage(mds, m));
return;
}
int who = m->get_source().num();
if (who == 0) {
dout(20) << " from mds0, new epoch" << endl;
beat_epoch = m->get_beat();
send_heartbeat();
show_imports();
}
mds_load[ who ] = m->get_load();
mds_import_map[ who ] = m->get_import_map();
//cout << " load is " << load << " have " << mds_load.size() << endl;
unsigned cluster_size = mds->get_mds_map()->get_num_mds();
if (mds_load.size() == cluster_size) {
// let's go!
//export_empties(); // no!
do_rebalance(m->get_beat());
}
// done
delete m;
}
void MDBalancer::export_empties()
{
dout(5) << "export_empties checking for empty imports" << endl;
for (set<CDir*>::iterator it = mds->mdcache->imports.begin();
it != mds->mdcache->imports.end();
it++) {
CDir *dir = *it;
if (!dir->inode->is_root() && dir->get_size() == 0)
mds->mdcache->migrator->export_empty_import(dir);
}
}
double MDBalancer::try_match(int ex, double& maxex,
int im, double& maxim)
{
if (maxex <= 0 || maxim <= 0) return 0.0;
double howmuch = MIN(maxex, maxim);
if (howmuch <= 0) return 0.0;
dout(5) << " - mds" << ex << " exports " << howmuch << " to mds" << im << endl;
if (ex == mds->get_nodeid())
my_targets[im] += howmuch;
exported[ex] += howmuch;
imported[im] += howmuch;
maxex -= howmuch;
maxim -= howmuch;
return howmuch;
}
void MDBalancer::do_hashing()
{
if (hash_queue.empty()) {
dout(20) << "do_hashing has nothing to do" << endl;
return;
}
dout(0) << "do_hashing " << hash_queue.size() << " dirs marked for possible hashing" << endl;
for (set<inodeno_t>::iterator i = hash_queue.begin();
i != hash_queue.end();
i++) {
inodeno_t dirino = *i;
CInode *in = mds->mdcache->get_inode(dirino);
if (!in) continue;
CDir *dir = in->dir;
if (!dir) continue;
if (!dir->is_auth()) continue;
dout(0) << "do_hashing hashing " << *dir << endl;
mds->mdcache->migrator->hash_dir(dir);
}
hash_queue.clear();
}
void MDBalancer::do_rebalance(int beat)
{
int cluster_size = mds->get_mds_map()->get_num_mds();
int whoami = mds->get_nodeid();
// reset
my_targets.clear();
imported.clear();
exported.clear();
dout(5) << " do_rebalance: cluster loads are" << endl;
// rescale! turn my mds_load back into meta_load units
double load_fac = 1.0;
if (mds_load[whoami].mds_load() > 0) {
load_fac = mds_load[whoami].root.meta_load() / mds_load[whoami].mds_load();
dout(7) << " load_fac is " << load_fac
<< " <- " << mds_load[whoami].root.meta_load() << " / " << mds_load[whoami].mds_load()
<< endl;
}
double total_load = 0;
multimap<double,int> load_map;
for (int i=0; i<cluster_size; i++) {
double l = mds_load[i].mds_load() * load_fac;
mds_meta_load[i] = l;
if (whoami == 0)
dout(-5) << " mds" << i
<< " meta load " << mds_load[i]
<< " = " << mds_load[i].mds_load()
<< " --> " << l << endl;
if (whoami == i) my_load = l;
total_load += l;
load_map.insert(pair<double,int>( l, i ));
}
// target load
target_load = total_load / (double)cluster_size;
dout(5) << "do_rebalance: my load " << my_load
<< " target " << target_load
<< " total " << total_load
<< endl;
// under or over?
if (my_load < target_load) {
dout(5) << " i am underloaded, doing nothing." << endl;
show_imports();
return;
}
dout(5) << " i am overloaded" << endl;
// first separate exporters and importers
multimap<double,int> importers;
multimap<double,int> exporters;
set<int> importer_set;
set<int> exporter_set;
for (multimap<double,int>::iterator it = load_map.begin();
it != load_map.end();
it++) {
if (it->first < target_load) {
dout(15) << " mds" << it->second << " is importer" << endl;
importers.insert(pair<double,int>(it->first,it->second));
importer_set.insert(it->second);
} else {
dout(15) << " mds" << it->second << " is exporter" << endl;
exporters.insert(pair<double,int>(it->first,it->second));
exporter_set.insert(it->second);
}
}
// determine load transfer mapping
if (true) {
// analyze import_map; do any matches i can
dout(5) << " matching exporters to import sources" << endl;
// big -> small exporters
for (multimap<double,int>::reverse_iterator ex = exporters.rbegin();
ex != exporters.rend();
ex++) {
double maxex = get_maxex(ex->second);
if (maxex <= .001) continue;
// check importers. for now, just in arbitrary order (no intelligent matching).
for (map<int, float>::iterator im = mds_import_map[ex->second].begin();
im != mds_import_map[ex->second].end();
im++) {
double maxim = get_maxim(im->first);
if (maxim <= .001) continue;
try_match(ex->second, maxex,
im->first, maxim);
if (maxex <= .001) break;;
}
}
}
if (1) {
if (beat % 2 == 1) {
// old way
dout(5) << " matching big exporters to big importers" << endl;
// big exporters to big importers
multimap<double,int>::reverse_iterator ex = exporters.rbegin();
multimap<double,int>::iterator im = importers.begin();
while (ex != exporters.rend() &&
im != importers.end()) {
double maxex = get_maxex(ex->second);
double maxim = get_maxim(im->second);
if (maxex < .001 || maxim < .001) break;
try_match(ex->second, maxex,
im->second, maxim);
if (maxex <= .001) ex++;
if (maxim <= .001) im++;
}
} else {
// new way
dout(5) << " matching small exporters to big importers" << endl;
// small exporters to big importers
multimap<double,int>::iterator ex = exporters.begin();
multimap<double,int>::iterator im = importers.begin();
while (ex != exporters.end() &&
im != importers.end()) {
double maxex = get_maxex(ex->second);
double maxim = get_maxim(im->second);
if (maxex < .001 || maxim < .001) break;
try_match(ex->second, maxex,
im->second, maxim);
if (maxex <= .001) ex++;
if (maxim <= .001) im++;
}
}
}
// make a sorted list of my imports
map<double,CDir*> import_pop_map;
multimap<int,CDir*> import_from_map;
for (set<CDir*>::iterator it = mds->mdcache->imports.begin();
it != mds->mdcache->imports.end();
it++) {
if ((*it)->is_hashed()) continue;
double pop = (*it)->popularity[MDS_POP_CURDOM].meta_load();
if (pop < g_conf.mds_bal_idle_threshold &&
(*it)->inode != mds->mdcache->get_root()) {
dout(-5) << " exporting idle import " << **it
<< " back to mds" << (*it)->inode->authority()
<< endl;
mds->mdcache->migrator->export_dir(*it, (*it)->inode->authority());
continue;
}
import_pop_map[ pop ] = *it;
int from = (*it)->inode->authority();
dout(15) << " map: i imported " << **it << " from " << from << endl;
import_from_map.insert(pair<int,CDir*>(from, *it));
}
// do my exports!
set<CDir*> already_exporting;
double total_sent = 0;
double total_goal = 0;
for (map<int,double>::iterator it = my_targets.begin();
it != my_targets.end();
it++) {
/*
double fac = 1.0;
if (false && total_goal > 0 && total_sent > 0) {
fac = total_goal / total_sent;
dout(-5) << " total sent is " << total_sent << " / " << total_goal << " -> fac 1/ " << fac << endl;
if (fac > 1.0) fac = 1.0;
}
fac = .9 - .4 * ((float)g_conf.num_mds / 128.0); // hack magic fixme
*/
int target = (*it).first;
double amount = (*it).second;// * load_fac;
total_goal += amount;
if (amount < MIN_OFFLOAD) continue;
dout(-5) << " sending " << amount << " to mds" << target
//<< " .. " << (*it).second << " * " << load_fac
<< " -> " << amount
<< endl;//" .. fudge is " << fudge << endl;
double have = 0;
show_imports();
// search imports from target
if (import_from_map.count(target)) {
dout(5) << " aha, looking through imports from target mds" << target << endl;
pair<multimap<int,CDir*>::iterator, multimap<int,CDir*>::iterator> p =
import_from_map.equal_range(target);
while (p.first != p.second) {
CDir *dir = (*p.first).second;
dout(5) << "considering " << *dir << " from " << (*p.first).first << endl;
multimap<int,CDir*>::iterator plast = p.first++;
if (dir->inode->is_root()) continue;
if (dir->is_hashed()) continue;
if (dir->is_freezing() || dir->is_frozen()) continue; // export pbly already in progress
double pop = dir->popularity[MDS_POP_CURDOM].meta_load();
assert(dir->inode->authority() == target); // cuz that's how i put it in the map, dummy
if (pop <= amount-have) {
dout(-5) << "reexporting " << *dir
<< " pop " << pop
<< " back to mds" << target << endl;
mds->mdcache->migrator->export_dir(dir, target);
have += pop;
import_from_map.erase(plast);
import_pop_map.erase(pop);
} else {
dout(5) << "can't reexport " << *dir << ", too big " << pop << endl;
}
if (amount-have < MIN_OFFLOAD) break;
}
}
if (amount-have < MIN_OFFLOAD) {
total_sent += have;
continue;
}
// any other imports
if (false)
for (map<double,CDir*>::iterator import = import_pop_map.begin();
import != import_pop_map.end();
import++) {
CDir *imp = (*import).second;
if (imp->inode->is_root()) continue;
double pop = (*import).first;
if (pop < amount-have || pop < MIN_REEXPORT) {
dout(-5) << "reexporting " << *imp
<< " pop " << pop
<< " back to mds" << imp->inode->authority()
<< endl;
have += pop;
mds->mdcache->migrator->export_dir(imp, imp->inode->authority());
}
if (amount-have < MIN_OFFLOAD) break;
}
if (amount-have < MIN_OFFLOAD) {
//fudge = amount-have;
total_sent += have;
continue;
}
// okay, search for fragments of my workload
set<CDir*> candidates = mds->mdcache->imports;
list<CDir*> exports;
for (set<CDir*>::iterator pot = candidates.begin();
pot != candidates.end();
pot++) {
find_exports(*pot, amount, exports, have, already_exporting);
if (have > amount-MIN_OFFLOAD) {
break;
}
}
//fudge = amount - have;
total_sent += have;
for (list<CDir*>::iterator it = exports.begin(); it != exports.end(); it++) {
dout(-5) << " exporting to mds" << target
<< " fragment " << **it
<< " pop " << (*it)->popularity[MDS_POP_CURDOM].meta_load()
<< endl;
mds->mdcache->migrator->export_dir(*it, target);
// hack! only do one dir.
break;
}
}
dout(5) << "rebalance done" << endl;
show_imports();
}
void MDBalancer::find_exports(CDir *dir,
double amount,
list<CDir*>& exports,
double& have,
set<CDir*>& already_exporting)
{
double need = amount - have;
if (need < amount * g_conf.mds_bal_min_start)
return; // good enough!
double needmax = need * g_conf.mds_bal_need_max;
double needmin = need * g_conf.mds_bal_need_min;
double midchunk = need * g_conf.mds_bal_midchunk;
double minchunk = need * g_conf.mds_bal_minchunk;
list<CDir*> bigger;
multimap<double, CDir*> smaller;
double dir_pop = dir->popularity[MDS_POP_CURDOM].meta_load();
double dir_sum = 0;
dout(-7) << " find_exports in " << dir_pop << " " << *dir << " need " << need << " (" << needmin << " - " << needmax << ")" << endl;
for (CDir_map_t::iterator it = dir->begin();
it != dir->end();
it++) {
CInode *in = it->second->get_inode();
if (!in) continue;
if (!in->is_dir()) continue;
if (!in->dir) continue; // clearly not popular
if (in->dir->is_export()) continue;
if (in->dir->is_hashed()) continue;
if (already_exporting.count(in->dir)) continue;
if (in->dir->is_frozen()) continue; // can't export this right now!
//if (in->dir->get_size() == 0) continue; // don't export empty dirs, even if they're not complete. for now!
// how popular?
double pop = in->dir->popularity[MDS_POP_CURDOM].meta_load();
dir_sum += pop;
dout(20) << " pop " << pop << " " << *in->dir << endl;
if (pop < minchunk) continue;
// lucky find?
if (pop > needmin && pop < needmax) {
exports.push_back(in->dir);
have += pop;
return;
}
if (pop > need)
bigger.push_back(in->dir);
else
smaller.insert(pair<double,CDir*>(pop, in->dir));
}
dout(7) << " .. sum " << dir_sum << " / " << dir_pop << endl;
// grab some sufficiently big small items
multimap<double,CDir*>::reverse_iterator it;
for (it = smaller.rbegin();
it != smaller.rend();
it++) {
if ((*it).first < midchunk)
break; // try later
dout(7) << " taking smaller " << *(*it).second << endl;
exports.push_back((*it).second);
already_exporting.insert((*it).second);
have += (*it).first;
if (have > needmin)
return;
}
// apprently not enough; drill deeper into the hierarchy (if non-replicated)
for (list<CDir*>::iterator it = bigger.begin();
it != bigger.end();
it++) {
if ((*it)->is_rep()) continue;
dout(7) << " descending into " << **it << endl;
find_exports(*it, amount, exports, have, already_exporting);
if (have > needmin)
return;
}
// ok fine, use smaller bits
for (;
it != smaller.rend();
it++) {
dout(7) << " taking (much) smaller " << it->first << " " << *(*it).second << endl;
exports.push_back((*it).second);
already_exporting.insert((*it).second);
have += (*it).first;
if (have > needmin)
return;
}
// ok fine, drill inot replicated dirs
for (list<CDir*>::iterator it = bigger.begin();
it != bigger.end();
it++) {
if (!(*it)->is_rep()) continue;
dout(7) << " descending into replicated " << **it << endl;
find_exports(*it, amount, exports, have, already_exporting);
if (have > needmin)
return;
}
}
void MDBalancer::hit_inode(CInode *in, int type)
{
// hit me
in->popularity[MDS_POP_JUSTME].pop[type].hit();
in->popularity[MDS_POP_NESTED].pop[type].hit();
if (in->is_auth()) {
in->popularity[MDS_POP_CURDOM].pop[type].hit();
in->popularity[MDS_POP_ANYDOM].pop[type].hit();
}
// hit auth up to import
CDir *dir = in->get_parent_dir();
if (dir) hit_dir(dir, type);
}
void MDBalancer::hit_dir(CDir *dir, int type)
{
// hit me
float v = dir->popularity[MDS_POP_JUSTME].pop[type].hit();
// hit modify counter, if this was a modify
if (g_conf.num_mds > 2 && // FIXME >2 thing
!dir->inode->is_root() && // not root (for now at least)
dir->is_auth()) {
//dout(-20) << "hit_dir " << type << " pop is " << v << " " << *dir << endl;
// hash this dir? (later?)
if (((v > g_conf.mds_bal_hash_rd && type == META_POP_IRD) ||
//(v > g_conf.mds_bal_hash_wr && type == META_POP_IWR) ||
(v > g_conf.mds_bal_hash_wr && type == META_POP_DWR)) &&
!(dir->is_hashed() || dir->is_hashing()) &&
hash_queue.count(dir->ino()) == 0) {
dout(0) << "hit_dir " << type << " pop is " << v << ", putting in hash_queue: " << *dir << endl;
hash_queue.insert(dir->ino());
}
}
hit_recursive(dir, type);
}
void MDBalancer::hit_recursive(CDir *dir, int type)
{
bool anydom = dir->is_auth();
bool curdom = dir->is_auth();
float rd_adj = 0.0;
// replicate?
float dir_pop = dir->popularity[MDS_POP_CURDOM].pop[type].get(); // hmm??
if (dir->is_auth()) {
if (!dir->is_rep() &&
dir_pop >= g_conf.mds_bal_replicate_threshold) {
// replicate
float rdp = dir->popularity[MDS_POP_JUSTME].pop[META_POP_IRD].get();
rd_adj = rdp / mds->get_mds_map()->get_num_mds() - rdp;
rd_adj /= 2.0; // temper somewhat
dout(1) << "replicating dir " << *dir << " pop " << dir_pop << " .. rdp " << rdp << " adj " << rd_adj << endl;
dir->dir_rep = CDIR_REP_ALL;
mds->mdcache->send_dir_updates(dir, true);
dir->popularity[MDS_POP_JUSTME].pop[META_POP_IRD].adjust(rd_adj);
dir->popularity[MDS_POP_CURDOM].pop[META_POP_IRD].adjust(rd_adj);
}
if (!dir->ino() != 1 &&
dir->is_rep() &&
dir_pop < g_conf.mds_bal_unreplicate_threshold) {
// unreplicate
dout(1) << "unreplicating dir " << *dir << " pop " << dir_pop << endl;
dir->dir_rep = CDIR_REP_NONE;
mds->mdcache->send_dir_updates(dir);
}
}
while (dir) {
CInode *in = dir->inode;
dir->popularity[MDS_POP_NESTED].pop[type].hit();
in->popularity[MDS_POP_NESTED].pop[type].hit();
if (rd_adj != 0.0) dir->popularity[MDS_POP_NESTED].pop[META_POP_IRD].adjust(rd_adj);
if (anydom) {
dir->popularity[MDS_POP_ANYDOM].pop[type].hit();
in->popularity[MDS_POP_ANYDOM].pop[type].hit();
}
if (curdom) {
dir->popularity[MDS_POP_CURDOM].pop[type].hit();
in->popularity[MDS_POP_CURDOM].pop[type].hit();
}
if (dir->is_import())
curdom = false; // end of auth domain, stop hitting auth counters.
dir = dir->inode->get_parent_dir();
}
}
/*
* subtract off an exported chunk
*/
void MDBalancer::subtract_export(CDir *dir)
{
meta_load_t curdom = dir->popularity[MDS_POP_CURDOM];
bool in_domain = !dir->is_import();
while (true) {
CInode *in = dir->inode;
in->popularity[MDS_POP_ANYDOM] -= curdom;
if (in_domain) in->popularity[MDS_POP_CURDOM] -= curdom;
dir = in->get_parent_dir();
if (!dir) break;
if (dir->is_import()) in_domain = false;
dir->popularity[MDS_POP_ANYDOM] -= curdom;
if (in_domain) dir->popularity[MDS_POP_CURDOM] -= curdom;
}
}
void MDBalancer::add_import(CDir *dir)
{
meta_load_t curdom = dir->popularity[MDS_POP_CURDOM];
bool in_domain = !dir->is_import();
while (true) {
CInode *in = dir->inode;
in->popularity[MDS_POP_ANYDOM] += curdom;
if (in_domain) in->popularity[MDS_POP_CURDOM] += curdom;
dir = in->get_parent_dir();
if (!dir) break;
if (dir->is_import()) in_domain = false;
dir->popularity[MDS_POP_ANYDOM] += curdom;
if (in_domain) dir->popularity[MDS_POP_CURDOM] += curdom;
}
}
void MDBalancer::show_imports(bool external)
{
mds->mdcache->show_imports();
}
/* replicate?
float dir_pop = dir->get_popularity();
if (dir->is_auth()) {
if (!dir->is_rep() &&
dir_pop >= g_conf.mds_bal_replicate_threshold) {
// replicate
dout(5) << "replicating dir " << *in << " pop " << dir_pop << endl;
dir->dir_rep = CDIR_REP_ALL;
mds->mdcache->send_dir_updates(dir);
}
if (dir->is_rep() &&
dir_pop < g_conf.mds_bal_unreplicate_threshold) {
// unreplicate
dout(5) << "unreplicating dir " << *in << " pop " << dir_pop << endl;
dir->dir_rep = CDIR_REP_NONE;
mds->mdcache->send_dir_updates(dir);
}
}
*/
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