Re: [patch] pg_basebackup: mention that spread checkpoints are the default in --help - Mailing list pgsql-hackers

Hi,

On Thu, 26 Oct 2023 at 13:58, Michael Banck <mbanck@gmx.net> wrote:
>
> Hi,
>
> On Wed, Oct 25, 2023 at 04:36:41PM +0200, Peter Eisentraut wrote:
> > On 19.10.23 11:39, Michael Banck wrote:
> > > Hi,
> > >
> > > I believed that spread (not fast) checkpoints are the default in
> > > pg_basebackup, but noticed that --help does not specify which is which -
> > > contrary to the reference documentation.
> > >
> > > So I propose the small attached patch to clarify that.
> >
> > >  printf(_("  -c, --checkpoint=fast|spread\n"
> > >-          "                         set fast or spread checkpointing\n"));
> > >+          "                         set fast or spread (default)
> > checkpointing\n"));
> >
> > Could we do like
> >
> >   -c, --checkpoint=fast|spread
> >                          set fast or spread checkpointing
> >                          (default: spread)
> >
> > This seems to be easier to read.
>
> Yeah, we could do that. But then again the question pops up what to do
> about the other option that mentions defaults (-F) and the others which
> have a default but it is not spelt out yet (-X, -Z at least) (output is
> still from v15, additional options have been added since):
>
>   -F, --format=p|t       output format (plain (default), tar)
>   -X, --wal-method=none|fetch|stream
>                          include required WAL files with specified method
>   -Z, --compress=0-9     compress tar output with given compression level
>
> So, my personal opinion is that we should really document -c because it
> is quite user-noticable compared to the others.
>
> So attached is a new version with just your proposed change for now.
>
>
> Michael

I went through the Cfbot for this patch and found out that the build
is failing with the following error (Link:
https://cirrus-ci.com/task/4648506929971200?logs=build#L1217):

[08:34:47.625] FAILED: src/bin/pg_basebackup/pg_basebackup.p/pg_basebackup.c.o
[08:34:47.625] ccache cc -Isrc/bin/pg_basebackup/pg_basebackup.p
-Isrc/include -I../src/include -Isrc/interfaces/libpq
-I../src/interfaces/libpq -Isrc/include/catalog -Isrc/include/nodes
-Isrc/include/utils -fdiagnostics-color=always -pipe
-D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -g -fno-strict-aliasing
-fwrapv -fexcess-precision=standard -D_GNU_SOURCE -Wmissing-prototypes
-Wpointer-arith -Werror=vla -Wendif-labels -Wmissing-format-attribute
-Wimplicit-fallthrough=3 -Wcast-function-type
-Wshadow=compatible-local -Wformat-security
-Wdeclaration-after-statement -Wno-format-truncation
-Wno-stringop-truncation -pthread -MD -MQ
src/bin/pg_basebackup/pg_basebackup.p/pg_basebackup.c.o -MF
src/bin/pg_basebackup/pg_basebackup.p/pg_basebackup.c.o.d -o
src/bin/pg_basebackup/pg_basebackup.p/pg_basebackup.c.o -c
../src/bin/pg_basebackup/pg_basebackup.c
[08:34:47.625] ../src/bin/pg_basebackup/pg_basebackup.c: In function ‘usage’:
[08:34:47.625] ../src/bin/pg_basebackup/pg_basebackup.c:411:5:
warning: statement with no effect [-Wunused-value]
[08:34:47.625] 411 | " (default: spread)\n"));
[08:34:47.625] | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[08:34:47.625] ../src/bin/pg_basebackup/pg_basebackup.c:411:51: error:
expected ‘;’ before ‘)’ token
[08:34:47.625] 411 | " (default: spread)\n"));
[08:34:47.625] | ^
[08:34:47.625] | ;
[08:34:47.625] ../src/bin/pg_basebackup/pg_basebackup.c:411:51: error:
expected statement before ‘)’ token
[08:34:47.625] ../src/bin/pg_basebackup/pg_basebackup.c:411:52: error:
expected statement before ‘)’ token
[08:34:47.625] 411 | " (default: spread)\n"));
[08:34:47.625] | ^
[08:34:47.629] [1210/1832] Compiling C object
src/bin/pg_dump/libpgdump_common.a.p/parallel.c.o
[08:34:47.639] [1211/1832] Compiling C object
src/bin/pg_basebackup/pg_recvlogical.p/pg_recvlogical.c.o
[08:34:47.641] [1212/1832] Linking static target
src/bin/pg_basebackup/libpg_basebackup_common.a
[08:34:47.658] [1213/1832] Compiling C object
src/bin/pg_dump/libpgdump_common.a.p/compress_io.c.o
[08:34:47.669] [1214/1832] Compiling C object
src/bin/pg_dump/libpgdump_common.a.p/compress_lz4.c.o
[08:34:47.678] [1215/1832] Compiling C object
src/bin/pg_dump/libpgdump_common.a.p/compress_zstd.c.o
[08:34:47.692] [1216/1832] Compiling C object
src/bin/pg_dump/libpgdump_common.a.p/dumputils.c.o
[08:34:47.692] ninja: build stopped: subcommand failed.

I also see that patch is marked 'Ready for Committer' on commitfest.

Just wanted to make sure, you are aware of this error.

Thanks,
Shlok Kumar Kyal