pg_upgrade: the tricky and dangerous parts
Postgres FM
How to Monitor and Allure for Corruption Errors in Postgres
The lesson here is definitely have monitoring and alluring for corruption errors. If you can afford it, justinitialize the replicas from scratch to avoid this risk. I cannot guarantee that without this option, with default behavior of R-sync, when it checks size and modification time, you will be fine. So I think some work should be done. And if you have ideas, please join the discussion on the hackers mailing list which I started yesterday.
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