return from eachRow() cassandra-driver for nodejs

In my node application, i am using following code to run some query. I want to call callback function after (arraySize > 100) and exit. Currently i can only exit after all processing is complete.

var matchedUsers = [];
client.eachRow(query, [], { prepare : true }, function (n, row) { 
      if(someCondition){
        matchedUsers.push(row.x);
      }

      if(matchedUsers.length>100){
        //exit here
      }
     }, function (err) {
        callback(matchedUsers)
     } );