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// grid.cpp
/**
* Copyright (C) 2010 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/>.
*
* 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 GNU Affero General 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/grid.h"
#include "mongo/base/status_with.h"
#include "mongo/client/connpool.h"
#include "mongo/s/catalog/catalog_cache.h"
#include "mongo/s/catalog/catalog_manager.h"
#include "mongo/s/catalog/legacy/catalog_manager_legacy.h"
#include "mongo/s/catalog/type_shard.h"
#include "mongo/s/type_collection.h"
#include "mongo/s/type_settings.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/log.h"
namespace mongo {
using boost::shared_ptr;
using std::endl;
using std::map;
using std::set;
using std::string;
using std::vector;
MONGO_FP_DECLARE(neverBalance);
Grid::Grid() : _allowLocalShard(true) {
}
bool Grid::initCatalogManager(const std::vector<std::string>& configHosts) {
std::auto_ptr<CatalogManagerLegacy> cm(new CatalogManagerLegacy());
Status status = cm->init(configHosts);
if (!status.isOK()) {
severe() << "Catalog manager failed to initialize " << status;
return false;
}
_catalogManager.reset(cm.release());
_catalogCache.reset(new CatalogCache(_catalogManager.get()));
return true;
}
StatusWith<shared_ptr<DBConfig>> Grid::implicitCreateDb(const std::string& dbName) {
auto status = catalogCache()->getDatabase(dbName);
if (status.isOK()) {
return status;
}
if (status == ErrorCodes::DatabaseNotFound) {
auto statusCreateDb = catalogManager()->createDatabase(dbName, NULL);
if (statusCreateDb.isOK() || statusCreateDb == ErrorCodes::NamespaceExists) {
return catalogCache()->getDatabase(dbName);
}
return statusCreateDb;
}
return status;
}
bool Grid::allowLocalHost() const {
return _allowLocalShard;
}
void Grid::setAllowLocalHost( bool allow ) {
_allowLocalShard = allow;
}
/*
* Returns whether balancing is enabled, with optional namespace "ns" parameter for balancing on a particular
* collection.
*/
bool Grid::shouldBalance(const SettingsType& balancerSettings) const {
// Allow disabling the balancer for testing
if (MONGO_FAIL_POINT(neverBalance)) return false;
if (balancerSettings.isBalancerStoppedSet() && balancerSettings.getBalancerStopped()) {
return false;
}
if (balancerSettings.isBalancerActiveWindowSet()) {
boost::posix_time::ptime now = boost::posix_time::second_clock::local_time();
return _inBalancingWindow(balancerSettings.getBalancerActiveWindow(), now);
}
return true;
}
bool Grid::getBalancerSettings(SettingsType* settings, string* errMsg) const {
BSONObj balancerDoc;
ScopedDbConnection conn(configServer.getPrimary().getConnString(), 30);
try {
balancerDoc = conn->findOne(SettingsType::ConfigNS,
BSON(SettingsType::key("balancer")));
conn.done();
}
catch (const DBException& ex) {
*errMsg = str::stream() << "failed to read balancer settings from " << conn.getHost()
<< ": " << causedBy(ex);
return false;
}
return settings->parseBSON(balancerDoc, errMsg);
}
bool Grid::getConfigShouldBalance() const {
SettingsType balSettings;
string errMsg;
if (!getBalancerSettings(&balSettings, &errMsg)) {
warning() << errMsg;
return false;
}
if (!balSettings.isKeySet()) {
// Balancer settings doc does not exist. Default to yes.
return true;
}
return shouldBalance(balSettings);
}
bool Grid::getCollShouldBalance(const std::string& ns) const {
BSONObj collDoc;
ScopedDbConnection conn(configServer.getPrimary().getConnString(), 30);
try {
collDoc = conn->findOne(CollectionType::ConfigNS, BSON(CollectionType::ns(ns)));
conn.done();
}
catch (const DBException& e){
conn.kill();
warning() << "could not determine whether balancer should be running, error getting"
<< "config data from " << conn.getHost() << causedBy(e) << endl;
// if anything goes wrong, we shouldn't try balancing
return false;
}
return !collDoc[CollectionType::noBalance()].trueValue();
}
bool Grid::_inBalancingWindow( const BSONObj& balancerDoc , const boost::posix_time::ptime& now ) {
// check the 'activeWindow' marker
// if present, it is an interval during the day when the balancer should be active
// { start: "08:00" , stop: "19:30" }, strftime format is %H:%M
BSONElement windowElem = balancerDoc[SettingsType::balancerActiveWindow()];
if ( windowElem.eoo() ) {
return true;
}
// check if both 'start' and 'stop' are present
if ( ! windowElem.isABSONObj() ) {
warning() << "'activeWindow' format is { start: \"hh:mm\" , stop: ... }" << balancerDoc << endl;
return true;
}
BSONObj intervalDoc = windowElem.Obj();
const string start = intervalDoc["start"].str();
const string stop = intervalDoc["stop"].str();
if ( start.empty() || stop.empty() ) {
warning() << "must specify both start and end of balancing window: " << intervalDoc << endl;
return true;
}
// check that both 'start' and 'stop' are valid time-of-day
boost::posix_time::ptime startTime, stopTime;
if ( ! toPointInTime( start , &startTime ) || ! toPointInTime( stop , &stopTime ) ) {
warning() << "cannot parse active window (use hh:mm 24hs format): " << intervalDoc << endl;
return true;
}
LOG(1).stream() << "_inBalancingWindow: "
<< " now: " << now
<< " startTime: " << startTime
<< " stopTime: " << stopTime;
// allow balancing if during the activeWindow
// note that a window may be open during the night
if ( stopTime > startTime ) {
if ( ( now >= startTime ) && ( now <= stopTime ) ) {
return true;
}
}
else if ( startTime > stopTime ) {
if ( ( now >=startTime ) || ( now <= stopTime ) ) {
return true;
}
}
return false;
}
BSONObj Grid::getConfigSetting( const std::string& name ) const {
ScopedDbConnection conn(configServer.getPrimary().getConnString(), 30);
BSONObj result = conn->findOne( SettingsType::ConfigNS,
BSON( SettingsType::key(name) ) );
conn.done();
return result;
}
Grid grid;
}
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