Patroni basebackup server compression not working in 4.1.1

On 4/22/26 12:30 AM, Radu Radutiu wrote:

Hi,

I am not able to enable basebackup server compression feature, which is
new in patroni 4.1.1.
OS: OEL 9.7
Patroni version: patroni-4.1.1-1PGDG.rhel9.7.noarch
Postgres: postgresql18-server-18.3-1PGDG.rhel9.7.x86_64
The following setting has been added to DCS under postgresql:
basebackup:
  - compress: server-zstd
I still get the following error in the patroni.log:
2026-04-22 02:51:44,693 ERROR: compress option for basebackup is not allowed
2026-04-22 02:51:44,693 ERROR: Error when parsing basebackup key-value
option server-zstd: only one key-value is allowed and value should be a
string

Have you tried with?:

- compress: 'server-zstd'

Per:

"ERROR: Error when parsing basebackup key-value option server-zstd: only
one key-value is allowed and value should be a string"

Has anyone been able to confirm that the feature is working?

Best regards,
Radu

--
Adrian Klaver
adrian.klaver@aklaver.com

It looks like a bug, it fails to correctly resolve the Postgres version
when $PGDATA is empty :(

On Wed, 22 Apr 2026 at 16:47, Adrian Klaver <adrian.klaver@aklaver.com>
wrote:

On 4/22/26 12:30 AM, Radu Radutiu wrote:

Hi,

I am not able to enable basebackup server compression feature, which is
new in patroni 4.1.1.
OS: OEL 9.7
Patroni version: patroni-4.1.1-1PGDG.rhel9.7.noarch
Postgres: postgresql18-server-18.3-1PGDG.rhel9.7.x86_64
The following setting has been added to DCS under postgresql:
basebackup:
- compress: server-zstd
I still get the following error in the patroni.log:
2026-04-22 02:51:44,693 ERROR: compress option for basebackup is not

allowed

2026-04-22 02:51:44,693 ERROR: Error when parsing basebackup key-value
option server-zstd: only one key-value is allowed and value should be a
string

Have you tried with?:

- compress: 'server-zstd'

Per:

"ERROR: Error when parsing basebackup key-value option server-zstd: only
one key-value is allowed and value should be a string"

Has anyone been able to confirm that the feature is working?

Best regards,
Radu

--
Adrian Klaver
adrian.klaver@aklaver.com

--
Regards,
--
Alexander Kukushkin

Empty PGDATA is the main usecase for basebackup with patroni, should I
open a ticket? The documentation is also not updated for this feature.

Rest regards,
Radu