Description

Description:

A new message compressor was added and should be documented.

Engineering Ticket Description:

from this I learn that zlib has been added as an option for --networkMessageCompressors. zstd uses much less CPU while matching zlib in compression rates. I hope you add it. Not only does this reduce server CPU but it also reduces latency in query responses. Using a DBMS not named MongoDB, switching from zlib to zstd for network compression was a huge win.

https://docs.mongodb.com/master/release-notes/3.6/
https://github.com/facebook/zstd

Scope of changes

• source/includes/extracts-4.2-changes.yaml
• source/includes/options-mongo.yaml
• source/includes/options-mongod.yaml
• source/includes/steps-4.2-downgrade-mongod.yaml
• source/includes/steps-4.2-downgrade-replica-set.yaml
• source/includes/steps-4.2-downgrade-sharded-cluster.yaml
• source/reference/connection-string.txt
• source/reference/glossary.txt
• source/release-notes/4.2-downgrade-replica-set.txt
• source/release-notes/4.2-downgrade-sharded-cluster.txt
• source/release-notes/4.2-downgrade-standalone.txt
• source/release-notes/4.2-downgrade.txt
• source/release-notes/4.2.txt

Impact to Other Docs

MVP (Work and Date)

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