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  1. WiredTiger
  2. WT-12312

Create a test where compaction occurs in parallel with writers on the same table

    • Type: Icon: Task Task
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Compaction
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    • Storage Engines
    • 3
    • 2024-02-06 tapioooooooooooooca

      The work in SERVER-80124 led to this specific scenario:

      • Compaction is executed on a table where blocks from the end of the file can be re-written to the start of the file.
      • In parallel and, before the blocks selected by compaction are re-written, data is inserted into those blocks at the start of the file by another writer.
        • This can happen as the first-fit strategy is set on the file as soon as compaction starts.
      • Compaction does little work and keeps trying which impacts performance.

      The test should implement the scenario described above and understand why compaction continues and where are the blocks re-written.

      In theory, if the previously freed blocks are no longer available, it is possible that compaction may extend the file to rewrite the selected blocks bu t this needs to be proven.

            Assignee:
            etienne.petrel@mongodb.com Etienne Petrel
            Reporter:
            etienne.petrel@mongodb.com Etienne Petrel
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