mongodb/mongo — comment on commit 9a02f4a03fa11e0f1eab4b8169b94f4a0615923c
File:  line 0
By kchodorow:

I'm not sure if this is necessary. Write locks are greedy so a secondary is more likely to starve reads than the sync thread. To keep replication up-to-date, we really need a way of prioritizing the oplog-reading thread on the primary.