[DOCS-13369] Investigate changes in SERVER-45440: Add support for implicit operation hedging when using readPreference mode nearest Created: 25/Jan/20  Updated: 13/Nov/23  Resolved: 05/Mar/20

Status: Closed
Project: Documentation
Component/s: manual, Server
Affects Version/s: None
Fix Version/s: 4.3.3, Server_Docs_20231030, Server_Docs_20231106, Server_Docs_20231105, Server_Docs_20231113

Type: Task Priority: Major - P3
Reporter: Backlog - Core Eng Program Management Team Assignee: Kay Kim (Inactive)
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Documented
documents SERVER-45440 Add support for implicit operation he... Closed
Related
related to DOCS-13375 Investigate changes in SERVER-45437: ... Closed
related to DOCS-13506 Investigate changes in SERVER-46567: ... Closed
is related to DRIVERS-723 Driver support for server Hedged Reads Closed
Participants:
Days since reply: 3 years, 48 weeks, 6 days ago
Epic Link: DOCS: 4.4 Server Release Work

 Description   

Description

Downstream Change Summary

After SERVER-45432 and SERVER-45434 are completed, mongos will perform hedged reads by default when the readPreference mode is “nearest”.

Description of Linked Ticket

Add support for implicit delay selection and opt in to hedge options when using readPreference nearest.

For all queries with readPreference mode "nearest", pass hedge options of:

Scope of changes

Update Doc DOCS ticket SERVER/DRIVER ticket
Server Selection DOCS-13369 SERVER-45440
Read pref nearest DOCS-13369 SERVER-45440
readHedgingMode (on/off) parameter DOCS-13375 SERVER-45437
maxTimeMSForHedgedReads DOCS-13429 SERVER-46234
Mongo.setReadPref  DOCS-13506 SERVER-46567
cursor.readPref  DOCS-13506  SERVER-46567
Blurb about driver helper methods and not connection string  DOCS-13586 DRIVERS-723

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Impact to Other Docs

MVP (Work and Date)

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



 Comments   
Comment by Githook User [ 05/Mar/20 ]

Author:

{'name': 'Kay Kim', 'username': 'kay-kim', 'email': 'kay.kim@10gen.com'}

Message: DOCS-13369,DOCS-13375,DOCS-13429, DOCS-13487 hedged reads for nearest, readHedgingMode param, maxTimeMSForHedgedReads, serverStatus hedging metrics
Branch: master
https://github.com/mongodb/docs/commit/76c7fddf7e3a41454f4f90c3c9b6226f641333e3

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