Client Backpressure for IWM 9.0 Release

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    • IWM Client Backpressure for 9.0 Release
    • Python Drivers
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      Summary of necessary driver changes

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      Commits for syncing spec/prose tests
      (and/or refer to an existing language POC if needed)

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      Context for other referenced/linked tickets

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      Summary of necessary driver changes   Commits for syncing spec/prose tests (and/or refer to an existing language POC if needed)   Context for other referenced/linked tickets  
    • In Progress
    • 16
    • 8
    • 0
    • 100
    • -50
    • 🟢 On Track
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      • SPEC PR has been merged, ticket state has been moved to TEAMS IMPLEMENTING. 
      • Added new ticket to ensure code examples are provided for the docs team DRIVERS-3584
      • Identified and mitigated a regression found in the BF-44986.
        • Python drivers needed optimization to fix performance numbers
        • Remaining regression identified as a false-positive and limit of the regression analysis running on Python
      Show
      SPEC PR has been merged, ticket state has been moved to TEAMS IMPLEMENTING.  Added new ticket to ensure code examples are provided for the docs team DRIVERS-3584 Identified and mitigated a regression found in the BF-44986. Python drivers needed optimization to fix performance numbers Remaining regression identified as a false-positive and limit of the regression analysis running on Python
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      2026-08-18 - 🟢 On Track

      • SPEC PR has been merged, ticket state has been moved to TEAMS IMPLEMENTING. 
      • Added new ticket to ensure code examples are provided for the docs team DRIVERS-3584
      • Identified and mitigated a regression found in the BF-44986.
        • Python drivers needed optimization to fix performance numbers
        • Remaining regression identified as a false-positive and limit of the regression analysis running on Python

       

      2026-07-29 - 🟢 On Track

      2026-07-07 - 🟢 On Track

      • (WRITING-38670) Constructed timeline estimation for internal DBX leads to agree on a code completion date
      • (SERVER-130142) Initial specification still under review. Also awaiting (SERVER-130142) to renamed retryAfterMS to baseBackoffMS
      • (DRIVERS-3530) Decision made on update to release notes. Awaiting changes from all teams.
      • Given no further plans to implement newer workloads, DRIVER’s commitment is to pass the pinned version; this is trivial and has been done against the PoC

      2026-06-24 - 🟢 On Track

      • Retryability timeline document approved. Describes work estimates and slated set of work will be tackled in order to achieve 9.0
      • (WRITING-37844) IWM 9.0 retryAfterMS sketch made and approved. Detailed the PoC to confirm data on simulations and ensure retryAfterMS doesn't lead to unexpected regressions.
      • https://jira.mongodb.org/browse/PERF-8759 perf testing followed
      • Results ultimately inconclusive on improved behavior in availability. Did not make it worse.
      • (WRITING-37915) Agreed in metric and motivation doc to only have error rate, latency, and throughput as guardrail metrics but move forward with retryAfterMS due to infrastructural benefits provided by the server configurability
      • (DRIVERS-3535) initial specification created and under review.
      • Selected C# as second implementer
      • Updated release note guidance on DRIVERS-3530 to state all drivers should remove hyperlinks in their release notes and state IWM apis will support 9.0
      Show
      2026-08-18 - 🟢 On Track SPEC PR has been merged, ticket state has been moved to TEAMS IMPLEMENTING.  Added new ticket to ensure code examples are provided for the docs team DRIVERS-3584 Identified and mitigated a regression found in the BF-44986. Python drivers needed optimization to fix performance numbers Remaining regression identified as a false-positive and limit of the regression analysis running on Python   2026-07-29 - 🟢 On Track 2026-07-07 - 🟢 On Track (WRITING-38670) Constructed timeline estimation for internal DBX leads to agree on a code completion date ( SERVER-130142 ) Initial specification still under review. Also awaiting ( SERVER-130142 ) to renamed retryAfterMS to baseBackoffMS (DRIVERS-3530) Decision made on update to release notes. Awaiting changes from all teams. Given no further plans to implement newer workloads, DRIVER’s commitment is to pass the pinned version; this is trivial and has been done against the PoC 2026-06-24 - 🟢 On Track Retryability timeline document approved. Describes work estimates and slated set of work will be tackled in order to achieve 9.0 (WRITING-37844) IWM 9.0 retryAfterMS sketch made and approved. Detailed the PoC to confirm data on simulations and ensure retryAfterMS doesn't lead to unexpected regressions. https://jira.mongodb.org/browse/PERF-8759 perf testing followed Results ultimately inconclusive on improved behavior in availability. Did not make it worse. (WRITING-37915) Agreed in metric and motivation doc to only have error rate, latency, and throughput as guardrail metrics but move forward with retryAfterMS due to infrastructural benefits provided by the server configurability ( DRIVERS-3535 ) initial specification created and under review. Selected C# as second implementer Updated release note guidance on DRIVERS-3530 to state all drivers should remove hyperlinks in their release notes and state IWM apis will support 9.0
    • Needed
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      Key Status/Resolution FixVersion
      CDRIVER-6378 Fixed 2.5.0
      CXX-3542 Done 4.6.0
      CSHARP-6140 Needs Triage
      GODRIVER-4054 In Progress
      JAVA-6261 Backlog
      NODE-7718 Fixed 7.6.0
      PYTHON-5967 In Progress
      PHPLIB-1918 Execution Blocked
      RUBY-3923 Ready for Work
      RUST-2461 Fixed 3.9.0
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      Summary

      The server will start to shed load during overload Targeting 9.0. We need a spec to do so safely and correctly.

      Motivation

      This is a critical piece of improving MongoDB Availability.

            Assignee:
            Jib Adegunloye
            Reporter:
            Jib Adegunloye
            Jib Adegunloye Jib Adegunloye
            Rishabh Bisht Rishabh Bisht
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            3 Start watching this issue

              Created:
              Updated:
              16 weeks
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