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  1. WiredTiger
  2. WT-5125

Adding new stats for eviction target strategy

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    Details

    • Type: Task
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: WT3.2.2, 4.2.2, 4.3.2, 4.0.15
    • Component/s: None
    • Labels:
      None
    • Story Points:
      5
    • Sprint:
      Storage Engines 2019-10-21, Storage Engines 2019-11-18
    • Backport Requested:
      v4.0

      Description

      In workloads with almost zero dirty cache usage we can occasionally get into a state where eviction doesn't evict much or anything for a while despite the cache fill ration being >90%. It appears this is related to heuristics around revisiting pages for eviction, as wiredtiger will visit a page for eviction and then skip it up to 5 times following on from that. Additionally the target page ratio isn't high as there isn't dirty content in the cache which means we give up eviction walks quickly.

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              Assignee:
              haribabu.kommi Haribabu Kommi
              Reporter:
              luke.pearson Luke Pearson
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                Created:
                Updated:
                Resolved: