From: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> |
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To: | tsunakawa(dot)takay(at)fujitsu(dot)com |
Cc: | osumi(dot)takamichi(at)fujitsu(dot)com, sfrost(at)snowman(dot)net, masao(dot)fujii(at)oss(dot)nttdata(dot)com, ashutosh(dot)bapat(dot)oss(at)gmail(dot)com, pgsql-hackers(at)lists(dot)postgresql(dot)org |
Subject: | Re: In-placre persistance change of a relation |
Date: | 2021-03-25 05:15:03 |
Message-ID: | 20210325.141503.245781197327278199.horikyota.ntt@gmail.com |
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Lists: | pgsql-hackers |
At Thu, 25 Mar 2021 14:08:05 +0900 (JST), Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> wrote in
> (I'm not sure when the subject was broken..)
>
> At Thu, 14 Jan 2021 17:32:17 +0900 (JST), Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> wrote in
> > Commit bea449c635 conflicts with this on the change of the definition
> > of DropRelFileNodeBuffers. The change simplified this patch by a bit:p
>
> In this version, I got rid of the "CLEANUP FORK"s, and added a new
> system "Smgr marks". The mark files have the name of the
> corresponding fork file followed by ".u" (which means Uncommitted.).
> "Uncommited"-marked main fork means the same as the CLEANUP2_FORKNUM
> and uncommitted-marked init fork means the same as the CLEANUP_FORKNUM
> in the previous version.x
>
> I noticed that the previous version of the patch still leaves an
> orphan main fork file after "BEGIN; CREATE TABLE x; ROLLBACK; (crash
> before checkpoint)" since the "mark" file (or CLEANUP2_FORKNUM) is
> revmoed at rollback. In this version the responsibility to remove the
> mark files is moved to SyncPostCheckpoint, where main fork files are
> actually removed.
For the record, I noticed that basebackup could be confused by the
mark files but I haven't looked that yet.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
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