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  1. WiredTiger
  2. WT-6136

Record incremental extent lists before merging them with earlier checkpoints

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: WT3.2.2, 4.2.7, 4.4.0-rc6, 4.7.0
    • Component/s: None
    • Labels:
      None
    • Case:
    • Story Points:
      8
    • Sprint:
      Storage - Tora 2020-05-18
    • Backport Requested:
      v4.2

      Description

      In some MongoDB preliminary testing, it was observed that WiredTiger was returning that blocks were modified that actually were the same on disk.

      The data shows that incremental cursors returned all of the 16MB blocks in a ~90GB file. Backups copied those blocks ... noting which ones were actually unique relative to previous file system copies. They found a large discrepancy, only 16 blocks were different out of ~5600.

      Investigate on the WiredTiger side.

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              Assignee:
              sue.loverso Susan LoVerso
              Reporter:
              sue.loverso Susan LoVerso
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                Created:
                Updated:
                Resolved: