On Sun, Apr 08, 2018 at 08:46:04AM +0300, Arseny Sher wrote: > I've discovered a couple of bugs in logical decoding code, both leading > to incorrect decoding results in somewhat rare cases. First, xmin of > slots is advanced too early. This affects the results only when > interlocking allows to perform DDL concurrently with looking at the > schema. In fact, I was not aware about such DDL until at > https://www.postgresql.org/message-id/flat/87tvu0p0jm.fsf%40ars-thinkpad#87tvu0p0jm.fsf@ars-thinkpad > I raised this question and Andres pointed out ALTER of composite > types. Probably there are others, I am not sure; it would be interesting > to know them. > > Another problem is that new snapshots are never queued to known > subxacts. It means decoding results can be wrong if toplevel doesn't > write anything while subxact does.
Most people are recovering from the last commit fest, where many patches have been discussed and dealt with. I have not looked in details at your patch so I cannot say is legit or not, but for now I would recommend to register this patch to the next commit fest under the category "Bug Fixes" so as it does not fall into the cracks: https://commitfest.postgresql.org/18/ I have added an entry to the open items in the section for older bugs: https://wiki.postgresql.org/wiki/PostgreSQL_11_Open_Items#Older_Bugs However this list tends to be... Er... Ignored. > Please see detailed description of the issues, tests which reproduce > them and fixes in the attached patch. Those are always good things to have in a patch. -- Michael
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