this.mapWrapper_callback = new TransactionMapWrapperCallback(hstore_site);
this.sendData_callback = new SendDataCallback(hstore_site);
//this.sendDataWrapper_callback = new SendDataWrapperCallback(hstore_site);
this.reduce_callback = new TransactionReduceCallback(hstore_site);
this.reduceWrapper_callback = new TransactionReduceWrapperCallback(hstore_site);
this.cleanup_callback = new RemoteFinishCallback(hstore_site);
}