[mongo] the mongo db check is causing the agent to hang

[clutchski]

The mongo check is causing the agent to hang. It seems like one of the network commands is hanging indefinitely.

From the logs:

2013-08-22 18:38:35,347 | INFO | dd.collector | checks.collector(collector.py:254) | Running check network
2013-08-22 18:38:35,349 | INFO | dd.collector | checks.collector(collector.py:254) | Running check mongo
2013-08-22 18:41:01,137 | ERROR | dd.collector | util(util.py:281) | Self-destructing...

Here's the info from the customer:

Fuller explanation on the mongo instance: I have wiped all data and allowed it to
rejoin the replication set. It is now in "STARTUP2" and loading data. All mong shell
connections are currently failing until it is in the "SECONDARY" state.

I think we should at minimum add a timeout to the network connection:

http://api.mongodb.org/python/2.2/api/pymongo/connection.html

[clutchski]

According to the client, adding a timeout fixed the issue:

conn = Connection(url, network_timeout=5 )