Description
On https://docs.mongodb.com/manual/faq/concurrency/#how-does-concurrency-affect-a-replica-set-primary, this FAQ should be updated for non-blocking secondary reads with WiredTiger in MongoDB 4.0:
How does concurrency affect secondaries?
In replication, MongoDB does not apply writes serially to secondaries. Secondaries collect oplog entries in batches and then apply those batches in parallel. Secondaries do not allow reads while applying the write operations, and apply write operations in the order that they appear in the oplog.
Scope of changes
Impact to Other Docs
MVP (Work and Date)
Resources (Scope or Design Docs, Invision, etc.)
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