Re: pgsql: Add suport for server-side LZ4 base backup compression.

On Fri, Feb 11, 2022 at 01:54:36PM +0000, Robert Haas wrote:
> Add suport for server-side LZ4 base backup compression.
>
> LZ4 compression can be a lot faster than gzip compression, so users
> may prefer it even if the compression ratio is not as good. We will
> want pg_basebackup to support LZ4 compression and decompression on the
> client side as well, and there is a pending patch for that, but it's
> by a different author, so I am committing this part separately for
> that reason.
>
> Jeevan Ladhe, reviewed by Tushar Ahuja and by me.

copperhead seems to be unhappy here:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=copperhead&dt=2022-02-11%2021%3A52%3A48
# Running: lz4 -d -m

/home/pgbf/buildroot/HEAD/pgsql.build/src/bin/pg_verifybackup/tmp_check/t_008_untar_primary_data/backup/server-backup/base.tar.lz4
Can't exec "lz4": No such file or directory at
/home/pgbf/buildroot/HEAD/pgsql.build/src/bin/pg_verifybackup/../../../src/test/perl/PostgreSQL/Test/Utils.pm
line 388.
Bail out!  failed to execute command "lz4 -d -m

/home/pgbf/buildroot/HEAD/pgsql.build/src/bin/pg_verifybackup/tmp_check/t_008_untar_primary_data/backup/server-backup/base.tar.lz4":
No such file or directory
### Stopping node "primary" using mode immediate

Perhaps you'd better check that 'decompress_program' can be executed
and skip things if the command is not around?  Note that
020_pg_receivewal.pl does an extra lz4 --version as a safety measure,
but 008_untar.pl does not.
--
Michael