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  1. Documentation
  2. DOCS-13369

Investigate changes in SERVER-45440: Add support for implicit operation hedging when using readPreference mode nearest

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Details

    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.3.3
    • manual, Server
    • None

    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

      =

      Impact to Other Docs

      MVP (Work and Date)

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

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              kay.kim@mongodb.com Kay Kim (Inactive)
              backlog-server-pm Backlog - Core Eng Program Management Team
              Kay Kim Kay Kim (Inactive)
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              Dates

                Created:
                Updated:
                Resolved:
                2 years, 38 weeks, 6 days ago