void createOplog() {
dblock lk;
const char * ns = "local.oplog.$main";
Client::Context ctx(ns);
NamespaceDetails * nsd = nsdetails( ns );
if ( nsd ) {
if ( cmdLine.oplogSize != 0 ){
int o = (int)(nsd->storageSize() / ( 1024 * 1024 ) );
int n = (int)(cmdLine.oplogSize / ( 1024 * 1024 ) );
if ( n != o ){
stringstream ss;
ss << "cmdline oplogsize (" << n << ") different than existing (" << o << ") see: http://dochub.mongodb.org/core/increase-oplog";
log() << ss.str() << endl;
throw UserException( 13257 , ss.str() );
}
}
DBDirectClient c;
BSONObj lastOp = c.findOne( ns, Query().sort( BSON( "$natural" << -1 ) ) );
if ( !lastOp.isEmpty() ) {
OpTime::setLast( lastOp[ "ts" ].date() );
}
return;
}
/* create an oplog collection, if it doesn't yet exist. */
BSONObjBuilder b;
double sz;
if ( cmdLine.oplogSize != 0 )
sz = (double)cmdLine.oplogSize;
else {
/* not specified. pick a default size */
sz = 50.0 * 1000 * 1000;
if ( sizeof(int *) >= 8 ) {
#if defined(__APPLE__)
// typically these are desktops (dev machines), so keep it smallish
sz = (256-64) * 1000 * 1000;
#else
sz = 990.0 * 1000 * 1000;
boost::intmax_t free = freeSpace(); //-1 if call not supported.
double fivePct = free * 0.05;
if ( fivePct > sz )
sz = fivePct;
#endif
}
}
log() << "******\n";
log() << "creating replication oplog of size: " << (int)( sz / ( 1024 * 1024 ) ) << "MB (use --oplogSize to change)\n";
log() << "******" << endl;
b.append("size", sz);
b.appendBool("capped", 1);
b.appendBool("autoIndexId", false);
string err;
BSONObj o = b.done();
userCreateNS(ns, o, err, false);
logOp( "n", "dummy", BSONObj() );
}
void createOplog() {
Lock::GlobalWrite lk;
const char * ns = "local.oplog.$main";
bool rs = !cmdLine._replSet.empty();
if( rs )
ns = rsoplog;
Client::Context ctx(ns);
NamespaceDetails * nsd = nsdetails( ns );
if ( nsd ) {
if ( cmdLine.oplogSize != 0 ) {
int o = (int)(nsd->storageSize() / ( 1024 * 1024 ) );
int n = (int)(cmdLine.oplogSize / ( 1024 * 1024 ) );
if ( n != o ) {
stringstream ss;
ss << "cmdline oplogsize (" << n << ") different than existing (" << o << ") see: http://dochub.mongodb.org/core/increase-oplog";
log() << ss.str() << endl;
throw UserException( 13257 , ss.str() );
}
}
if( rs ) return;
DBDirectClient c;
BSONObj lastOp = c.findOne( ns, Query().sort(reverseNaturalObj) );
if ( !lastOp.isEmpty() ) {
OpTime::setLast( lastOp[ "ts" ].date() );
}
return;
}
/* create an oplog collection, if it doesn't yet exist. */
BSONObjBuilder b;
double sz;
if ( cmdLine.oplogSize != 0 )
sz = (double)cmdLine.oplogSize;
else {
/* not specified. pick a default size */
sz = 50.0 * 1000 * 1000;
if ( sizeof(int *) >= 8 ) {
#if defined(__APPLE__)
// typically these are desktops (dev machines), so keep it smallish
sz = (256-64) * 1000 * 1000;
#else
sz = 990.0 * 1000 * 1000;
boost::intmax_t free = File::freeSpace(dbpath); //-1 if call not supported.
double fivePct = free * 0.05;
if ( fivePct > sz )
sz = fivePct;
#endif
}
}
log() << "******" << endl;
log() << "creating replication oplog of size: " << (int)( sz / ( 1024 * 1024 ) ) << "MB..." << endl;
b.append("size", sz);
b.appendBool("capped", 1);
b.appendBool("autoIndexId", false);
string err;
BSONObj o = b.done();
userCreateNS(ns, o, err, false);
if( !rs )
logOp( "n", "", BSONObj() );
/* sync here so we don't get any surprising lag later when we try to sync */
MemoryMappedFile::flushAll(true);
log() << "******" << endl;
}