Hi Chris, > I ran into a funny situation today regarding PostgreSQL replication and > wal corruption and wanted to go over what I think happened and what I > wonder about as a possible solution.
Sad story. Unfortunately I have no idea what could be a reason nor can I suggest a good way to find it unless there is an already know sequence of steps that reproduces an issue. I just wanted to point out that a hardware issue or third party software issues (bugs in FS, software RAID, ...) could not be fully excluded from the list of suspects. According to the talk by Christophe Pettus [1] it's not that uncommon as most people think. If the issue reproduces from time to time on one replica and doesn't on the second identical replica there is a good chance that you've faced a hardware issue. Another thing that is worth checking is a SMART status of the hard drive. [1]: http://www.pgcon.org/2017/schedule/attachments/453_corruption-pgcon-2017.pdf -- Best regards, Aleksander Alekseev
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