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  1. WiredTiger
  2. WT-4307

Mitigate overhead from copying keys when creating transaction op structure

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: None
    • 1
    • Storage Engines 2018-09-24, Storage Engines 2018-10-08

      In order to support long running prepared transactions, we allow pages with prepared updates to be evicted. To support that, we need to know the key when resolving a prepared transaction to find the update in the lookaside file again.

      We recently introduced code to always copy the key when populating a WT_TXN_OP structure - that adds a performance penalty for transactions that never prepare, since their updates can't be evicted.

      We should investigate paths to avoid the copy in the common case.

        1. possible_regress.png
          39 kB
          Sulabh Mahajan

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