Re: Improve description of XLOG_RUNNING_XACTS

Hi

On Thu, Jul 21, 2022 at 6:44 AM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>
> Hi,
>
> I realized that standby_desc_running_xacts() in standbydesc.c doesn't
> describe subtransaction XIDs. I've attached the patch to improve the
> description. Here is an example by pg_wlaldump:
>
> * HEAD
> rmgr: Standby len (rec/tot): 58/ 58, tx: 0, lsn:
> 0/01D0C608, prev 0/01D0C5D8, desc: RUNNING_XACTS nextXid 1050
> latestCompletedXid 1047 oldestRunningXid 1048; 1 xacts: 1048
>
> * w/ patch
> rmgr: Standby len (rec/tot): 58/ 58, tx: 0, lsn:
> 0/01D0C608, prev 0/01D0C5D8, desc: RUNNING_XACTS nextXid 1050
> latestCompletedXid 1047 oldestRunningXid 1048; 1 xacts: 1048; 1
> subxacts: 1049
>

I think this is a good addition to debugging info. +1

If we are going to add 64 subxid numbers then it would help if we
could be more verbose and print "subxid overflowed" instead of "subxid
ovf".

--
Best Wishes,
Ashutosh Bapat