I have a trouble after switching from Ubuntu 14.x to 16.x. MongoDB processes like configuration servers, arbiter and the main MongoDB server are running well. I can access to my databases with the Mongo shell.
But the problem comes with mongos. It crashes when I want to launch it (with --upgrade) saying that the balancer must be stopped before running an upgrade. But I have stopped it a few seconds earlier!
With the Mongo shell I did:
sh.stopBalancer ()
Then I verified the state with:
sh.getBalancerState ()
The returned value is false.
But I still get the same error from mongos! (balancer must be stopped for config upgrade)
Few lines before (in the mongos output) I got this:
scoped connection to xxx not being returned to the pool
But I don't understand the sentence. I don't know if it's related to my problem.
So the final question: how could I start mongos successfully?
