Simon Riggs writes:
On Wed, Feb 1, 2012 at 10:42 PM, Jim Nasby wrote:
But we already had RelFileNode; wouldn't that be enough to tell what rmgr was responsible for the new page? Can 2 different rmgrs write to the same file node?
No, but which one? No way to tell unless you have full list of
relfilenodes and check each one. So btree changes look like heap
changes etc..
What I'm not following is why we should care. There are no cases at
present where this matters, and no proposed patches (that I know of)
that would make it matter. If an individual rmgr needs control of
what happens during a given operation, it wouldn't use XLOG_NEWPAGE
to represent the operation. End of problem. You haven't provided
any convincing argument why this needs to be changed globally.

regards, tom lane

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