fix mongo exporter auth in secondary mongod #29
Merged
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The current mongoexporter cannot log in the secondary mongod as it does not have permission.
The default mode is that reads and writes will always be made to the primary mongod. As we force mongoexporter to directly connect to the local mongod, when the local mongod is secondary, it does not have permission to login.
In order to fix this, we need to set mode before log in. Mgo requries that the consistency requirements set to be Monotonic or Eventual for direct connection. Set session mode to be eventual before login can fix the problem.
Test in a tools secondary mongod (4cfe1d6c.sjc4.w.wish.com):