Hi, On 2022-06-22 19:12:14 -0400, Tom Lane wrote: > "Bagga, Rishu" <bagri...@amazon.com> writes: > > The current SLRU pages do not have any header, so there is a need to > > create a new page header format for these. Our investigations revealed > > that we need to: > > > 1. track LSN to ensure durability and consistency of all pages (for redo > > and full page write purposes) > > 2. have a checksum (for page correctness verification). > > 3. A flag to identify if the page is a relational or BufferedObject > > 4. Track version information. > > Isn't this a nonstarter from the standpoint of pg_upgrade?
We're rewriting some relation forks as part of pg_upgrade (visibility map IIRC?), so rewriting an SLRU is likely not prohibitive - there's much more of a limit to the SLRU sizes than the number and aggregate size of relation forks. Greetings, Andres Freund
