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  1. Documentation
  2. DOCS-14135

Investigate changes in SERVER-53247: Disable enableMajorityReadConcern:false

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    Details

    • Type: Task
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.9.0
    • Component/s: manual, Server
    • Labels:
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      Description

      Description

      Downstream Change Summary

      The server explicitly disallows enableMajorityReadConcern:false to be specified on the command line when starting mongod. Any team that current sets this server parameter to false will be affected.

      Since we are removing support for the behaviors gated by that server parameter, teams should also be able to remove testing and code using eMRC=false. Please see PM-1769 for more information about what else the server is planning to remove.

      Description of Linked Ticket

      WiredTiger recently completed an investigation of the feasibility of removing enableMajorityReadConcern:false now that WT has durable history. After reviewing the findings of that investigation, we are moving forward with Removing Support for enableMajorityReadConcern:false. Durable History addresses cache pressure concerns around majority commit point lag allowing for the removal of eMRC:false (a mode of operation that does not allow distributed transactions and other features).

      We need to disable support for eMRC:false as a first step.

      In a future release, we will fully remove support for eMRC:false.

      Scope of changes

      Review https://docs.mongodb.com/manual/reference/read-concern-majority/#disable-read-concern-majority and possibly other mentions?

      One approach might be to replace that section with a blurb like 'Starting in MDB 5.0, you can't do this. If you're an older version, refer to those docs to see how to disable maj RC."

      Impact to Other Docs

      https://docs.mongodb.com/manual/reference/configuration-options/index.html#replication.enableMajorityReadConcern

      https://docs.mongodb.com/manual/reference/program/mongod/index.html#cmdoption-mongod-enablemajorityreadconcern

      https://docs.mongodb.com/manual/core/transactions/index.html#disabled-read-concern-majority

      https://docs.mongodb.com/manual/core/transactions-production-consideration/index.html#member-primary-secondary-arbiter-architecture

      Does this also apply to the replication / sharding settings / parameters?

      https://docs.mongodb.com/manual/reference/configuration-options/#replication.enableMajorityReadConcern

      https://docs.mongodb.com/manual/core/transactions-sharded-clusters/index.html#three-member-primary-secondary-arbiter-shards

      https://docs.mongodb.com/manual/tutorial/change-sharded-cluster-wiredtiger/index.html#psa-3-member-architecture

      https://docs.mongodb.com/manual/tutorial/change-replica-set-wiredtiger/index.html#psa-3-member-architecture

       

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              Assignee:
              joseph.dougherty Joseph Dougherty
              Reporter:
              backlog-server-pm Backlog - Core Eng Program Management Team
              Participants:
              Last commenter:
              Joseph Dougherty Joseph Dougherty
              Docs Reviewer:
              Andrew Feierabend Andrew Feierabend (Inactive)
              External Reviewer:
              Samyukta Lanka
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                Dates

                Due:
                Created:
                Updated:
                Resolved:
                Days since reply:
                14 weeks, 5 days ago
                Date of 1st Reply: