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The most common use of hidden nodes is to support delayed members. If you only need to prevent a member from becoming primary, configure a priority 0 member. If the settings.chainingAllowed setting allows secondary members to sync from other secondaries, MongoDB by default prefers non-hidden members over hidden members when selecting a sync target.
How to hide a secondary member in MongoDB?
To configure a secondary member as hidden, set its members [n].priority value to 0 and set its members [n].hidden value to true in its member configuration: The following example hides the secondary member currently at the index 0 in the members array.
How to force a member to become primary in MongoDB?
In a mongo shell, run rs.status () to ensure your replica set is running as expected. In a mongo shell connected to the mongod instance running on mdb2.example.net, freeze mdb2.example.net so that it does not attempt to become primary for 120 seconds.
Can a hidden member become a primary member?
Hidden members are part of a replica set but cannot become primary and are invisible to client applications. Hidden members may vote in elections. For more information on hidden members and their uses, see Hidden Replica Set Members. The most common use of hidden nodes is to support delayed members.
Why is it recommended not to close a MongoDB connection anywhere in?
Consider following is the Node.js code: See the link for best practice, which says not to close any connections https://groups.google.com/forum/#!topic/node-mongodb-native/5cPt84TUsVg I have seen log file contains following data:
Can a Node.js driver stop a MongoDB server?
The mongodb-topology-manager npm package is indispensible for testing MongoDB connection logic. This lib can stop and start MongoDB servers, replica sets, and sharded clusters from Node.js. The MongoDB driver Node.js uses it for testing internally.