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  1. Core Server
  2. SERVER-33538

mapReduce "replace" on a sharded output collection can lead to UUIDCatalog inconsistencies

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    • Minor Change
    • ALL
    • v4.0
    • Storage NYC 2018-03-26, Sharding 2018-05-21, Sharding 2018-06-04
    • 60

    Description

      mapReduce with a sharded output collection assigns the UUID obtained from the config server to the final output collection. mapReduce "replace" will drop the existing output collection, which has the same UUID as the new output collection. Two-phase-drop may cause the dropCollection to finish after the renameCollection finishes, erroneously removing the UUIDCatalog entry for the output collection.

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              janna.golden@mongodb.com Janna Golden
              maria.vankeulen@mongodb.com Maria van Keulen
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