Secondaries should call into lower level create collection API during oplog application

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    • Type: Bug
    • Resolution: Unresolved
    • Priority: Major - P3
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      Currently, secondaries call a high level create collection API - create_collection.h's createCollection - which performs FCV / feature flag checks.

      Due to how FCV transitions can interleave with creating oplog entries, this means that a scenario is possible where the primary creates oplog entries like:

      [
    {setFCV: "transitioning to 8.0"},
    {create: 'test.mycoll', useFeatureOn8_1: true}
]

      However when the secondary applies these oplog entries, it will end up crashing because after it has entered the downgrading ("transitioning to 8.0") state, it tries to create a collection with the 8.1 feature and the feature flag check fires due to the secondary calling the higher level API.

      This is a particular instance of SERVER-79269.

            Assignee:
            Unassigned
            Reporter:
            Vishnu Kaushik
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              Created:
              Updated: