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  1. Core Server
  2. SERVER-16261

Make insert on update (upsert: true) atomic with query + insert

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    • Backwards Compatibility:
      Major Change

      Description

      The update operation (with upsert:true) is not currently atomic, for both the query + resulting insert. In highly active environments this will results in duplicated documents or an error due to unique index constraints.

      The preferred behavior is that all updates will insert a new document or update the existing one, and not result in duplicate documents.

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              Reporter:
              lubinwang lubinwang
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