Questions
7 of 11
1You are running a 3-node replica set across two data centers (2 nodes in DC-A, 1 node in DC-B). If the network link between the DCs breaks, what happens to your application's ability to write?
2Explain the 'Oplog' (Operations Log) architecture. What happens if the Oplog is too small?
3When would you use a 'Delayed Member' or a 'Hidden Member'?
4How does 'Read Preference' differ from 'Read Concern'?
5Deep dive into Write Concern. What happens under the hood when you use { w: 'majority', j: true }?
6Discuss replication in MongoDB?
7What is Replica Set?
8Explain how the Raft consensus algorithm works within MongoDB Replication.
9What are replica set members?
10What is a 'Rollback' in the context of a replica set, and how do you minimize its occurrence?
11What is 'Replication Lag' and what are the top three reasons it occurs in a Node.js-backed system?
