Details
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Bug
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Resolution: Duplicate
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Major - P3
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None
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None
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None
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Fully Compatible
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ALL
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Storage 2017-10-23
Description
In a replica set, after setFeatureCompatibilityVersion: 3.4 returns successfully, it is still possible for a minority of nodes to contain UUIDs. If a user then shuts down those nodes and downgrades their binaries to 3.4, the UUIDs will stick around and get stale while the data changes.