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  1. Core Server
  2. SERVER-41472

Create a workload to demonstrate the MongoDB usage difficulties of the WT WT_STAT_CONN_CACHE_LOOKASIDE_SCORE stat

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    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Duplicate
    • None
    • None
    • Storage
    • None
    • Storage Execution

    Description

      The WT_STAT_CONN_CACHE_LOOKASIDE_SCORE stat does not work well as a means for MongoDB to recognize cache pressure in the WT layer because it does not move like we need it to do.

      In SERVER-36956 we replaced WT_STAT_CONN_CACHE_LOOKASIDE_SCORE with the WT_STAT_CONN_CACHE_LOOKASIDE_INSERT stat. This is because we saw problems noted in SERVER-40685, where the lookaside score can remain high even after cache pressure goes down.

      The goal of this ticket is to create a workload to give to WT to demonstrate the problem so that they can fix it and confirm the problem is resolved.

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          duplicates

          Improvement - An improvement or enhancement to an existing feature or task. WT-4842 Enhance lookaside score calculation

          • Major - P3 - Major loss of function.
          • Closed
          related to

          Bug - A problem which impairs or prevents the functions of the product. SERVER-40685 Mongos often fails transactions that use "snapshot" with SnapshotTooOld

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-36956 Replace the statistic that dynamically resizes the snapshot history window

          • Major - P3 - Major loss of function.
          • Closed

          Activity

            People

              backlog-server-execution Backlog - Storage Execution Team
              dianna.hohensee@mongodb.com Dianna Hohensee (Inactive)
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              Dates

                Created:
                Updated:
                Resolved: