| From: | "kuroda(dot)hayato(at)fujitsu(dot)com" <kuroda(dot)hayato(at)fujitsu(dot)com> |
|---|---|
| To: | 'Masahiko Sawada' <sawada(dot)mshk(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | RE: TRAP: FailedAssertion("prev_first_lsn < cur_txn->first_lsn", File: "reorderbuffer.c", Line: 927, PID: 568639) |
| Date: | 2022-10-18 01:30:57 |
| Message-ID: | TYAPR01MB58665F6334F6F20F14344714F5289@TYAPR01MB5866.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
Dear Sawada-san, Amit,
> IIUC Change-2 is required in v16 and HEAD but not mandatory in v15 and
> v14. The reason why we need Change-2 is that there is a case where we
> mark only subtransactions as containing catalog change while not doing
> that for its top-level transaction. In v15 and v14, since we mark both
> subtransactions and top-level transaction in
> SnapBuildXidSetCatalogChanges() as containing catalog changes, we
> don't get the assertion failure at "Assert(!needs_snapshot ||
> needs_timetravel)".
Incidentally, I agreed that Change-2 is needed for HEAD (and v16), not v15 and v14.
Best Regards,
Hayato Kuroda
FUJITSU LIMITED
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