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  1. Core Server
  2. SERVER-62804

Support retention of valid cursor across aggregation and getMore for the $exchange operator

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    • Type: Icon: Task Task
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
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    • Storage Execution
    • Execution Team 2022-09-05, Execution Team 2022-09-19

      SERVER-60742 implemented support for agg/getMore, but disabled it in the case of $exchange. The issue is that a PlanExecutor can have nested PlanExecutors in their plan trees, and in the case of $exchange the nested PlanExecutor can be shared across multiple ClientCursors – a mutex protects against concurrent access. So we will need to associate RecoveryUnits with PlanExecutors rather than ClientCursors, and have a mechanism by which we load the appropriate RU onto the opCtx for the duration of the use of an associated PlanExecutor.

            Assignee:
            backlog-server-execution [DO NOT USE] Backlog - Storage Execution Team
            Reporter:
            dianna.hohensee@mongodb.com Dianna Hohensee (Inactive)
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              Created:
              Updated: