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  1. Core Server
  2. SERVER-66541

Clear the Collection Sharding State map during the setFCV command

    • Type: Icon: Task Task
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 6.0.0-rc11
    • Affects Version/s: None
    • Component/s: Sharding
    • None
    • Fully Compatible
    • v6.0
    • Sharding EMEA 2022-05-30, Sharding EMEA 2022-06-13, Sharding EMEA 2022-06-27

      The goal of this task is to clear the Collection Sharding State map (i.e. all collections) during the setFCV upgrade to 6.0.

      The reason to do that is to define a barrier from which all shards must know what they own at all moment. We can do this because since 5.3 we introduced a new migration protocol that guarantees that both donor and recipient update their filtering information as part of the commit phase. Before that, we had a weaker guarantee: the donor for sure knew about the migration but for the recipient we just triggered a best-effort refresh.

      This change should land on 6.0.

            Assignee:
            sergi.mateo-bellido@mongodb.com Sergi Mateo Bellido
            Reporter:
            sergi.mateo-bellido@mongodb.com Sergi Mateo Bellido
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              Created:
              Updated:
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