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  1. WiredTiger
  2. WT-6513

Update history store configuration to make overflow keys unlikely

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: WT10.0.0, 4.9.0, 4.4.5
    • Component/s: None
    • Labels:
      None
    • Story Points:
      5
    • Sprint:
      Storage - Ra 2021-01-25, Storage - Ra 2021-02-08, Storage - Ra 2021-02-22

      Description

      Our current History Store create configuration string is:

      "key_format="IuQQ",value_format="QQQu",block_compressor="WT_HS_COMPRESSOR                                     ",leaf_value_max=64MB,prefix_compression=false"
      

      We should update the configuration to make it very unlikely that we'll ever use overflow keys in the history store. Probably by setting leaf_key_max and internal_key_max to the same value as leaf_value_max.

      The default value is 1/10th of a page split size. The default page size is 4KB meaning that the overflow size is about 400 bytes. MongoDB could definitely be triggering that with indexes at the moment.

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              Assignee:
              sulabh.mahajan Sulabh Mahajan
              Reporter:
              alexander.gorrod Alexander Gorrod
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                Updated:
                Resolved: