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  • Are you running both mySql and MongoDB on the same host? Commented Jan 29, 2016 at 2:16
  • 1
    nope, separated machines. Commented Jan 29, 2016 at 12:44
  • Hard to diagnose without without seeing the code and a lot more details. If I had to guess, I'd say we see a lot of parallel operations on the same collection, triggered by some sort of import maybe, most likely updating existing docs. Commented Feb 8, 2016 at 23:55
  • Besides the code, what could I add so you can get more clues? Commented Feb 9, 2016 at 15:42
  • 2
    When I ask how you authenticate I mean the mechanism, not the user ID. Say, you could authenticate against an external LDAP server or something like that. Commented Feb 10, 2016 at 21:45