Runnig a single Mongod instance using default logging level. Normally, I use Pymongo to read and write data. All these commands would be correctly log in mongod log. Recently, experience a problem with a piece of python code using both multiprocessing and multi-threading to write data into Mongod. Inside Mongod log, I only see the meta data from the IP addresses running these processes/threads, but cannot see any command come they use although data has been loading into mongodb. Increase mongo logging level does not help.