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  1. Core Server
  2. SERVER-52974

Checking if destined recipient has changed for resharding creates another full copy of the updated document

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    • Fully Compatible
    • ALL
    • Sharding 2020-11-30
    • 0

    Description

      mutablebson::Document::getObject() renders a full copy of the updated document. This can be expensive for larger documents. At minimum we should skip calling it when the collection isn't even sharded like UpdateStage::checkUpdateChangesShardKeyFields() does. Better would be to consolidate some the _doc.getObject() calls that UpdateStage::checkUpdateChangesShardKeyFields(), UpdateStage::wasReshardingKeyUpdated(), and updates which weren't performed in-place all do.

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              max.hirschhorn@mongodb.com Max Hirschhorn
              max.hirschhorn@mongodb.com Max Hirschhorn
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