In a replica set if primary has problems writing to the oplog, for example because of corruption there, it still continues applying writes, but they never go to oplog. Thus they are not replicating. Additionally, once the problem is identified, there is no easy way to recover the applied data if it's not in the oplog.
Primary should abort if it encountered data access related assertions in
the oplog collection, including:
- invalid bsonobjsize
- delete bucket corrupted