Re: A failure of standby to follow timeline switch

At Thu, 7 Jan 2021 11:55:33 +0900, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com> wrote in
>
>
> On 2021/01/05 17:26, Kyotaro Horiguchi wrote:
> > At Mon, 4 Jan 2021 19:00:21 +0900, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>
> > wrote in
> >>
> >>
> >> On 2021/01/04 12:06, Kyotaro Horiguchi wrote:
> >>> At Sat, 26 Dec 2020 02:15:06 +0900, Fujii Masao
> >>> <masao(dot)fujii(at)oss(dot)nttdata(dot)com> wrote in
> >>>>
> >>>> On 2020/12/25 12:03, Kyotaro Horiguchi wrote:
> >>> The attached is the fixed version.
> >>
> >> Thanks for updating the patches!
> >>
> >>> In the first patch, the test added to 001_stream_rep.pl involves two
> >>> copied functions related to server-log investigation from
> >>> 019_repslot_limit.pl.
> >>
> >> So you're planning to define them commonly in TestLib.pm or elsewhere?
> > Yeah.. That's correct. Newly added as the first patch.
> > While making that change, I extended the interface of slurp_file to
> > allow reading from arbitrary position.
>
> Is this extension really helpful for current use case?
> At least I'd like to avoid back-patching this since it's an exntesion...

Yeah, I felt a hesitattion about it a bit. It's less useful assuming
that log files won't get so large. Removed in this version.

> OsFHandleOpen(my $fh = IO::Handle->new(), $fHandle, 'r')
> or croak "could not read \"$filename\": $^E\n";
> + seek($fh, $from, 0)
> + or croak "could not seek \"$filename\" to $from: $^E\n";
>
> I'm not familiar with this area, but SetFilePointer() is more suitable
> rather than seek()?

SetFilePointer() works for a native handle, IO::Handle->new()
here. seek() works on $fh, a perl handle. If ReadFile is used later
SetFilePointer() might be needed separately.

Anyway, it is removed.

--
Kyotaro Horiguchi
NTT Open Source Software Center