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Ok, it's an interesting concept but not without risk, there's questions about consistency if they start cherry-picking what changes out of the binlogs to apply.
To clarify Aurora capabilities:
- you cannot access the actual binlog files
- you can attach as a replication slave and request binlog records from a given position. The slave can be another Aurora or MySQL instance/cluster replaying the logs, DMS, binlog proxy (eg. MaxScale) or some other type of binlog parser
- Aurora does not support filtered replication
Since we're talking about DR strategy, they should ship the binlogs off the Aurora cluster anyway for this particular use case, so #2 above comes into play. Once they have them externally to the Aurora cluster on a proxy or something they can process/analyze them as needed, but it would be a manual process.
They would need to test it out. I don't know of any customers that do that today, so it's hard to say whether they will encounter other gotcha's or not.
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