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  1. Core Server
  2. SERVER-36961

createIndexes command should check if index already exists with weak lock

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Details

    • Improvement
    • Status: Closed
    • Critical - P2
    • Resolution: Fixed
    • None
    • 3.6.9, 4.0.3, 4.1.4
    • Storage
    • None
    • Fully Compatible
    • v4.0, v3.6
    • Storage NYC 2018-09-24
    • 8

    Description

      Currently createIndexes command takes the locks it needs to actual create an index.  If the index already exists (as is the case in a lot of scenarios where "just in case" createIndex is sent periodically or before running some process) concurrency could benefit significantly from checking if the index already exists under a weak lock.

      This would benefit cases where the index exists as is (success returned) or the index exists but with different options (failure returned) - neither of these would contribute to command requiring a strong lock.

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              louis.williams@mongodb.com Louis Williams
              asya.kamsky@mongodb.com Asya Kamsky
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                Created:
                Updated:
                Resolved: