Description

The following two pages (both 4.0 and 4.2 versions) state that secondary reads are blocked while oplog batches are being applied:

1. https://docs.mongodb.com/manual/core/replica-set-sync/#replication
2. https://docs.mongodb.com/v4.0/faq/concurrency/#how-does-concurrency-affect-secondaries

My understanding is that behaviour changed in MongoDB 4.0.

Can someone please confirm and update those pages if they are no longer correct?

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)