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  1. Java Driver
  2. JAVA-519

MongoDB's connection is not a effective connection to a MongDB server where new Mongo(serverAddressList)

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    • Type: Icon: Bug Bug
    • Resolution: Won't Fix
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 2.6.5, 2.7.2
    • Component/s: None

      Here is our code to start mongoDB:

      for (String hostName : hostNames) {
            String tmp[] = hostName.split(":");
            ServerAddress addr = new ServerAddress(tmp[0], Integer.parseInt(tmp[1]));
            hosts.add(addr);
        }
        mongo = new Mongo(hosts);
        db = mongo.getDB(dbName);
        WriteConcern wc = WriteConcern.valueOf(writeConcernName);
        db.setWriteConcern(wc);
        if (this.slaveOk) {
            db.slaveOk();
}

      I find that Mongo instance does not check master;

      The code of checking master is in Upate class:

      _mongo.getConnector().checkMaster(true, false);//the second argument is failIfNoMaster

      The checkMaster method code is in DBTcpConnection:

      void checkMaster( boolean force , boolean failIfNoMaster )
        throws MongoException {
        
        if ( _rsStatus != null ){
            if ( _masterPortPool == null || force ){
                ReplicaSetStatus.Node n = _rsStatus.ensureMaster();
                if ( n == null ){
                    if ( failIfNoMaster )
                        throw new MongoException( "can't find a master" );
                }
                else {
                    _set( n._addr );
                    maxBsonObjectSize = _rsStatus.getMaxBsonObjectSize();
                }
            }
        } else {
            // single server, may have to obtain max bson size
            if (maxBsonObjectSize == 0)
                    maxBsonObjectSize = fetchMaxBsonObjectSize();
        }
    }

      So,there are two problem:

      First is:if I want to check master in staring my web applcation,I just have no choice;

      Second is: The Mongo object instance actually represents a pool of connections to the database,this thing is not any valuable if we don't check master;

      I suggest that you can make checkMaster method publicly or get us a button is check master.

            Assignee:
            jeff.yemin@mongodb.com Jeffrey Yemin
            Reporter:
            boringkiller xfc
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              Created:
              Updated:
              Resolved: