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  1. Core Server
  2. SERVER-28026

Disable auto-tuning of WiredTiger eviction threads

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    Details

    • Type: Task
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.2.13, 3.4.3, 3.5.4
    • Component/s: WiredTiger
    • Labels:
      None
    • Backwards Compatibility:
      Fully Compatible
    • Backport Completed:
    • Backport Requested:
      v3.2
    • Sprint:
      Storage 2017-03-06
    • Linked BF Score:
      0

      Description

      In WT-2898, we added code to automatically tune the number of eviction worker threads in WiredTiger. That work (a) assumed eviction.threads_max was reasonably large (e.g., 8), and (b) was driven by test workloads where the behavior at startup matches the long-term workload behavior.

      To avoid MongoDB users being adversely affected by that change, we should disable it in 3.2 and 3.4 by changing the default eviction.threads_min=4 – i.e., min threads = max threads = 4.

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                  Updated:
                  Resolved: