Details
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Task
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Status: Closed
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Major - P3
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Resolution: Won't Do
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Description
Engineering Ticket Description:
Create a v=2 index on the "admin.system.version" collection when the featureCompatibilityVersion is set to 3.4. Versions of MongoDB earlier than 3.4 will fail create a v=2 index during steady-state replication. The index should be removed when the featureCompatibilityVersion is set to 3.2.
In order to address how the implementation of initial sync on the 3.2 branch uses Cloner::copydb(), which automatically "upgrades" (i.e. silently discards) the index version and builds all indexes with the default index version of the node copying the data, the index version of the v=2 index should be returned as a decimal value in the "listIndexes" command response to prevent a 3.2 secondary from performing initial sync from a 3.4 mongod with featureCompatibilityVersion=3.4.
Attachments
Issue Links
- documents
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SERVER-25725 Running {setFeatureCompatibilityVersion: "3.4"} on a 3.4 primary should kill 3.2 secondaries
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- Closed
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