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Type:
Bug
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Resolution: Unresolved
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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None
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Storage Execution
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ALL
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200
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.
- is related to
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- Backlog
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- Closed
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SERVER-79269 Invariant that we don't check FCV in oplog application
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- Open
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- related to
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- Closed
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- Closed
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