ServerSelectionTimeoutError

[sjoertvv]

Running into problem with step 1; connecting to the database. Running the examples in the notebook yields a similar error.

If this build is not yet ready for testing just let me know. I was motivated by the example on the TWiki

python3 
>>> from extcats import CatalogQuery  
>>> test = CatalogQuery.CatalogQuery('milliquas', ra_key = 'ra', dec_key = 'dec')
---------------------------------------------------------------------------
ServerSelectionTimeoutError               Traceback (most recent call last)
<ipython-input-2-054c83d72c9c> in <module>()
----> 1 test = CatalogQuery.CatalogQuery('milliquas', ra_key = 'ra', dec_key = 'dec')

~/Applications/extcats/extcats/CatalogQuery.py in __init__(self, cat_name, ra_key, dec_key, coll_name, dbclient, logger)
     67         if dbclient is None:
     68             self.dbclient = pymongo.MongoClient()
---> 69         self.logger.info("using mongo client at %s:%d"%(self.dbclient.address))
     70 
     71         # find database and collection

/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py in address(self)
    695                                  TOPOLOGY_TYPE.Single):
    696             return None
--> 697         return self._server_property('address')
    698 
    699     @property

/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py in _server_property(self, attr_name)
    661         """
    662         server = self._topology.select_server(
--> 663             writable_server_selector)
    664 
    665         return getattr(server.description, attr_name)

/usr/local/lib/python3.6/site-packages/pymongo/topology.py in select_server(self, selector, server_selection_timeout, address)
    222         return random.choice(self.select_servers(selector,
    223                                                  server_selection_timeout,
--> 224                                                  address))
    225 
    226     def select_server_by_address(self, address,

/usr/local/lib/python3.6/site-packages/pymongo/topology.py in select_servers(self, selector, server_selection_timeout, address)
    181         with self._lock:
    182             server_descriptions = self._select_servers_loop(
--> 183                 selector, server_timeout, address)
    184 
    185             return [self.get_server_by_address(sd.address)

/usr/local/lib/python3.6/site-packages/pymongo/topology.py in _select_servers_loop(self, selector, timeout, address)
    197             if timeout == 0 or now > end_time:
    198                 raise ServerSelectionTimeoutError(
--> 199                     self._error_message(selector))
    200 
    201             self._ensure_opened()

ServerSelectionTimeoutError: localhost:27017: [Errno 61] Connection refused

[sjoertvv]

It turns pymongo will happily try to do its thing even when mongo is not installed.

Following steps solved the issue:

brew install mongo
sudo mkdir -p /data/db
sudo chmod 0755 /data/db

When I start mongo (mongod) before the notebook, I can run the examples.

[MatteoGiomi]

yes, you need to have mongo installed and the daemon up and running otherwise you'd wait the timeout time (I think 30s by default) just to get the exception.