geo_mapreduce2.js

// Geo mapreduce 2 from SERVER-3478

var coll = db.geoMR2
coll.drop()

for( var i = 0; i < 300; i++ )
    coll.insert({ i : i, location : [ 10, 20 ] })
    
coll.ensureIndex({ location : "2d" })

// map function
m = function() {
    emit( null, { count : this.i } )
}

// reduce function
r = function( key, values ) {
    
    var total = 0
    for ( var i = 0; i < values.length; i++ ) {
        total += values[i].count
    }
    
    return { count : total }
};

try{ coll.mapReduce( m, r, 
               { out : coll.getName() + "_mr", 
                 sort : { _id : 1 }, 
                 query : { 'location' : { $within : { $centerSphere : [[ 10, 20 ], 0.01 ] } } } })

}
catch( e ){
    // This should occur, since we can't in-mem sort for mreduce
    printjson( e )
}