Details
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Bug
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Resolution: Fixed
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Major
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7.6.0
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None
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Untriaged
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0
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Unknown
Description
set/add with meta can update the CAS of a vbucket to any value - a faulty input can "poison" the max_cas of the vbucket - affecting the hybrid logical clock logic (and impacting LWW XDCR).
KV offers two modes of protection to prevent the above
- Error - If the input CAS exceeds the current wall clock time by a configured threshold,KV rejects the operation and an error is returned.
- Replace - In this mode KV accepts the operation but the CAS is regenerated.
Currently if the protection is set to replace mode, CAS in the response for Add/Set with meta is set to the input provided (poisoned CAS) instead of the newly generated CAS.
Attachments
Issue Links
- relates to
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MB-61385 Limit vbucket "max_cas"
- In Progress