Description

Description:

Change streams can now used when enableMajorityReadConcern:false in 4.2.

Engineering Ticket Description:

Allow change streams to work with the speculative majority reads implementation, so that they can work correctly even without storage engine support for majority reads enabled.

Scope of changes

• source/includes/extracts-changestream.yaml
• source/changeStreams.txt
• source/includes/fact-enable-majority-readConcern.rst
• source/reference/method/Mongo.watch.txt
• source/reference/method/db.collection.watch.txt
• source/reference/method/db.watch.txt
• source/reference/read-concern-majority.txt
• source/includes/options-mongod.yaml

Rel Notes

• source/release-notes/4.2.txt
• source/release-notes/4.2-compatibility.txt

Upgrades should be aware of

• source/release-notes/4.0-upgrade-replica-set.txt
• source/release-notes/4.0-upgrade-sharded-cluster.txt

• source/release-notes/4.2-upgrade-replica-set.txt
• source/release-notes/4.2-upgrade-sharded-cluster.txt
• source/tutorial/upgrade-revision.txt

• source/tutorial/change-replica-set-wiredtiger.txt
• source/tutorial/change-sharded-cluster-wiredtiger.txt

Downgrade should call out:

• source/release-notes/4.2-downgrade-replica-set.txt
• source/release-notes/4.2-downgrade-sharded-cluster.txt
• source/release-notes/4.2-downgrade.txt

Impact to Other Docs

MVP (Work and Date)

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