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// ttl.cpp
/**
* 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/>.
*/
#include "pch.h"
#include "mongo/db/ttl.h"
#include "mongo/base/counter.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/user_name.h"
#include "mongo/db/client.h"
#include "mongo/db/commands/fsync.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/db/database_holder.h"
#include "mongo/db/instance.h"
#include "mongo/db/ops/delete.h"
#include "mongo/db/repl/is_master.h"
#include "mongo/db/server_parameters.h"
#include "mongo/util/background.h"
namespace mongo {
Counter64 ttlPasses;
Counter64 ttlDeletedDocuments;
ServerStatusMetricField<Counter64> ttlPassesDisplay("ttl.passes", &ttlPasses);
ServerStatusMetricField<Counter64> ttlDeletedDocumentsDisplay("ttl.deletedDocuments", &ttlDeletedDocuments);
MONGO_EXPORT_SERVER_PARAMETER( ttlMonitorEnabled, bool, true );
class TTLMonitor : public BackgroundJob {
public:
TTLMonitor(){}
virtual ~TTLMonitor(){}
virtual string name() const { return "TTLMonitor"; }
static string secondsExpireField;
void doTTLForDB( const string& dbName ) {
bool isMaster = isMasterNs( dbName.c_str() );
vector<BSONObj> indexes;
{
auto_ptr<DBClientCursor> cursor =
db.query( dbName + ".system.indexes" ,
BSON( secondsExpireField << BSON( "$exists" << true ) ) ,
0 , /* default nToReturn */
0 , /* default nToSkip */
0 , /* default fieldsToReturn */
QueryOption_SlaveOk ); /* perform on secondaries too */
if ( cursor.get() ) {
while ( cursor->more() ) {
indexes.push_back( cursor->next().getOwned() );
}
}
}
for ( unsigned i=0; i<indexes.size(); i++ ) {
BSONObj idx = indexes[i];
BSONObj key = idx["key"].Obj();
if ( key.nFields() != 1 ) {
error() << "key for ttl index can only have 1 field" << endl;
continue;
}
BSONObj query;
{
BSONObjBuilder b;
b.appendDate( "$lt" , curTimeMillis64() - ( 1000 * idx[secondsExpireField].numberLong() ) );
query = BSON( key.firstElement().fieldName() << b.obj() );
}
LOG(1) << "TTL: " << key << " \t " << query << endl;
long long n = 0;
{
string ns = idx["ns"].String();
Client::WriteContext ctx( ns );
NamespaceDetails* nsd = nsdetails( ns );
if ( ! nsd ) {
// collection was dropped
continue;
}
if ( nsd->setUserFlag( NamespaceDetails::Flag_UsePowerOf2Sizes ) ) {
nsd->syncUserFlags( ns );
}
// only do deletes if on master
if ( ! isMaster ) {
continue;
}
n = deleteObjects( ns.c_str() , query , false , true );
ttlDeletedDocuments.increment( n );
}
LOG(1) << "\tTTL deleted: " << n << endl;
}
}
virtual void run() {
Client::initThread( name().c_str() );
cc().getAuthorizationSession()->grantInternalAuthorization(UserName("_ttl", "local"));
while ( ! inShutdown() ) {
sleepsecs( 60 );
LOG(3) << "TTLMonitor thread awake" << endl;
if ( !ttlMonitorEnabled ) {
LOG(1) << "TTLMonitor is disabled" << endl;
continue;
}
if ( lockedForWriting() ) {
// note: this is not perfect as you can go into fsync+lock between
// this and actually doing the delete later
LOG(3) << " locked for writing" << endl;
continue;
}
// if part of replSet but not in a readable state (e.g. during initial sync), skip.
if ( theReplSet && !theReplSet->state().readable() )
continue;
set<string> dbs;
{
Lock::DBRead lk( "local" );
dbHolder().getAllShortNames( dbs );
}
ttlPasses.increment();
for ( set<string>::const_iterator i=dbs.begin(); i!=dbs.end(); ++i ) {
string db = *i;
try {
doTTLForDB( db );
}
catch ( DBException& e ) {
error() << "error processing ttl for db: " << db << " " << e << endl;
}
}
}
}
DBDirectClient db;
};
void startTTLBackgroundJob() {
TTLMonitor* ttl = new TTLMonitor();
ttl->go();
}
string TTLMonitor::secondsExpireField = "expireAfterSeconds";
}
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