BSONObj ClusteredCursor::explain(){
// Note: by default we filter out allPlans and oldPlan in the shell's
// explain() function. If you add any recursive structures, make sure to
// edit the JS to make sure everything gets filtered.
BSONObjBuilder b;
b.append( "clusteredType" , type() );
long long millis = 0;
double numExplains = 0;
map<string,long long> counters;
map<string,list<BSONObj> > out;
{
_explain( out );
BSONObjBuilder x( b.subobjStart( "shards" ) );
for ( map<string,list<BSONObj> >::iterator i=out.begin(); i!=out.end(); ++i ){
string shard = i->first;
list<BSONObj> l = i->second;
BSONArrayBuilder y( x.subarrayStart( shard ) );
for ( list<BSONObj>::iterator j=l.begin(); j!=l.end(); ++j ){
BSONObj temp = *j;
y.append( temp );
BSONObjIterator k( temp );
while ( k.more() ){
BSONElement z = k.next();
if ( z.fieldName()[0] != 'n' )
continue;
long long& c = counters[z.fieldName()];
c += z.numberLong();
}
millis += temp["millis"].numberLong();
numExplains++;
}
y.done();
}
x.done();
}
for ( map<string,long long>::iterator i=counters.begin(); i!=counters.end(); ++i )
b.appendNumber( i->first , i->second );
b.appendNumber( "millisTotal" , millis );
b.append( "millisAvg" , (int)((double)millis / numExplains ) );
b.append( "numQueries" , (int)numExplains );
b.append( "numShards" , (int)out.size() );
return b.obj();
}
BSONObj ClusteredCursor::explain(){
BSONObjBuilder b;
b.append( "clusteredType" , type() );
long long nscanned = 0;
long long nscannedObjects = 0;
long long n = 0;
long long millis = 0;
double numExplains = 0;
map<string,list<BSONObj> > out;
{
_explain( out );
BSONObjBuilder x( b.subobjStart( "shards" ) );
for ( map<string,list<BSONObj> >::iterator i=out.begin(); i!=out.end(); ++i ){
string shard = i->first;
list<BSONObj> l = i->second;
BSONArrayBuilder y( x.subarrayStart( shard.c_str() ) );
for ( list<BSONObj>::iterator j=l.begin(); j!=l.end(); ++j ){
BSONObj temp = *j;
y.append( temp );
nscanned += temp["nscanned"].numberLong();
nscannedObjects += temp["nscannedObjects"].numberLong();
n += temp["n"].numberLong();
millis += temp["millis"].numberLong();
numExplains++;
}
y.done();
}
x.done();
}
b.appendNumber( "nscanned" , nscanned );
b.appendNumber( "nscannedObjects" , nscannedObjects );
b.appendNumber( "n" , n );
b.appendNumber( "millisTotal" , millis );
b.append( "millisAvg" , (int)((double)millis / numExplains ) );
b.append( "numQueries" , (int)numExplains );
b.append( "numShards" , (int)out.size() );
return b.obj();
}
