Connecting to MongoDB using Lithium li3 Framework

Question

I am writing a relatively simple app in the Lithium (li3) Framework. I am using MongoDB as the datastore. My MongoDB database is hosted in the cloud - at MongoHQ.

I am getting intermittent errors when trying to post data. At times it will work - but then I will get an error that says the following:

    Fatal error: Uncaught exception 'MongoConnectionException' with 
message 'connecting to mongodb://USERNAME:PASSWORD@flame.mongohq.com:27052/DATABASENAME failed: 
Operation now in progress' in 
/Applications/MAMP/htdocs/quizapp/libraries/lithium/data/source/MongoDb.php:257 Stack trace: 
#0 /Applications/MAMP/htdocs/quizapp/libraries/lithium/data/source/MongoDb.php(257): Mongo-
>__construct('mongodb://mongo...', Array) #1 
/Applications/MAMP/htdocs/quizapp/libraries/lithium/data/Source.php(90): 
lithium\data\source\MongoDb->connect() #2 
/Applications/MAMP/htdocs/quizapp/libraries/lithium/data/source/MongoDb.php(160): 
lithium\data\Source->_init() #3 
/Applications/MAMP/htdocs/quizapp/libraries/lithium/core/Object.php(93): 
lithium\data\source\MongoDb->_init() #4 
/Applications/MAMP/htdocs/quizapp/libraries/lithium/data/Source.php(73): lithium\core\Object-
>__construct(Array) #5 
/Applications/MAMP/htdocs/quizapp/libraries/lithium/data/source/MongoDb.php(156): 
lithium\data\Source->__construct(Array) #6 /Applications/MAMP/htdocs/quizapp/libra in 
/Applications/MAMP/htdocs/quizapp/libraries/lithium/data/source/MongoDb.php on line 263

I am running this on MAMP on a Mac. I have tried to stop and restart Apache - but it does not seem to fix the problem. However, I do seem to connect to MongoDB 1 out of every 10 to 15 attempts. I cannot figure out any trends.

Any help will be greatly appreciated.

Thank you

Nino

Answer 1

I can see two possible issues here:

• A firewall, and a description to turn that off is at: https://groups.google.com/forum/#!msg/mongodb-user/9-DYhQWEo0E/B4UsY53S1IwJ
• Slow connections — in some cases a connection to a host is too slow. And since version 1.3.4 of the Mongo PHP driver (which li3 uses) there is great control over timeouts. Have a look at the timeout option at http://www.php.net/manual/en/mongoclient.construct.php — you will most likely want to increase that (but make sure you use 1.3.4 or later of the driver).