Detail
There can be certain factors or misconfiguration impacting accuracy of replication to a destination cluster.Answer
Known cases for xdr rewind discrepancies: (Not full exhaustive list)
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XDR forwarding not enabled and source cluster had records written by XDR.
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re-repl timeout occurring during XDR rewind.
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Truncate running on destination after XDR rewind had already started
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Out of order XDR shipping of queued up delete and writes to a cluster having migrations.
- Misconfigured XDR seed list where Source cluster accidentally point to two separate clusters.
- Forwarding enabled and source cluster had records written by XDR and bin convergence is enabled.