On Fri, Jul 20, 2018 at 10:13:58AM +0900, Masahiko Sawada wrote: > Also, I'm not sure it's a good way to show the distance as LSN. LSN is > a monotone increasing value but in your patch, a value of the "remain" > column can get decreased.
If that can happen, I think that this is a very, very bad idea. A couple of code paths, including segment recycling and the new WAL advancing rely on such monotonic properties. That would be also very confusing for any monitoring job looking at pg_replication_slots. -- Michael
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