This block of code has 2 if-statements which will cover all cases, preventing the else-branch which blacklists the current sync source from ever being reached.
This code is new in 3.3
syncSourceFeedback can spin, with network traffic, during reconfig
add support to OplogFetcher for restarting oplog query
SyncSourceFeedback spams log on errors
Data Replicator Reporter - Extend Reporter to support keep alive and downconversion for pre-3.2.4.servers
Data Replicator Reporter - Integrate into SyncSourceFeedback