Uploaded image for project: 'Documentation'
  1. Documentation
  2. DOCS-12085

Docs for SERVER-35656: Ensure a 4.0 mongos crashes upon attempting to connect to an FCV 4.2 cluster

    XMLWordPrintableJSON

Details

    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.1.1
    • manual, Server
    • None

    Description

      Description

      Description:

      Document the changed behavior in adding a 4.0 mongos to a 4.2 cluster

      Engineering Ticket Description:

      As part of SERVER-32635, a last-stable binary version mongos will crash upon attempting to connect to a latest featureCompatibilityVersion cluster. However, since this behavior was added for 4.0 mongos and FCV 4.2 was not present at the time, some special testing behavior was necessary to simulate a 4.0 mongos crashing. As part of the 4.2 upgrade/downgrade work, the crash_mongos_against_upgraded_cluster.js test should be updated to no longer rely on these failpoints and just directly use a 4.0 mongos and FCV 4.2 cluster. The failpoints/wireVersion added as part of SERVER-32635 solely for simulation of the crash should also be removed.

      Scope of changes

      • Add note to:
        • mongos ref and conceptual pages
        • sharded cluster update page
      • the 4.0 version already mentions the fcv/mongos in 4.0 compatibility:
        • for now, won't add to 4.0 mongos ref and conceptual pages

      Impact to Other Docs

      MVP (Work and Date)

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

      Attachments

        Issue Links

          Activity

            People

              kay.kim@mongodb.com Kay Kim (Inactive)
              kay.kim@mongodb.com Kay Kim (Inactive)
              Jess Mokrzecki Jess Mokrzecki
              Votes:
              0 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:
                4 years, 46 weeks, 2 days ago