On Tue, Jul 19, 2022 at 01:13:07PM -0500, Justin Pryzby wrote:
> On Tue, Jul 19, 2022 at 01:24:30PM -0400, Bruce Momjian wrote:
> > Well, I put the --no-synchronized-snapshots item in incompatibilities
> > since it is a user-visible change that might require script adjustments.
> > However, I put the limit of pg_dump to 9.2 and greater into the pg_dump
> > section. Are you suggesting I move the--no-synchronized-snapshots item
> > down there? That doesn't match with the way I have listed other
> > incompatibilities so I am resistant to do that.
>
> I'd rather see the "limit support to v9.2" be moved or added to the
> "incompatibilities" section, maybe with "remove --no-synchronized-snapshots"
> as a secondary sentence.
Is removing support for an older version an incompatibility --- I didn't
think so.
> > > > 0. Add support for LZ4 and Zstandard compression of server-side base
> > > > backups (Jeevan Ladhe, Robert Haas)
> > > > 1. Allow pg_basebackup to use LZ4 and Zstandard compression on
> > > > server-side base backup files (Dipesh Pandit, Jeevan Ladhe)
> > > > 2. Allow pg_basebackup's --compress option to control the compression
> > > > method and options (Michael Paquier, Robert Haas)
> > > > New options include server-gzip (gzip on the server), client-gzip
> > > > (same as gzip).
> > > > 3. Allow pg_basebackup to compress on the server side and decompress on
> > > > the client side before storage (Dipesh Pandit)
> > > > This is accomplished by specifying compression on the server side
> > > > and plain output format.
> > >
> > > I still think these expose the incremental development rather than the
> > > user-facing change.
> >
> > > 1. It seems wrong to say "server-side" since client-side compression with
> > > LZ4/zstd is also supported.
> >
> > Agreed. I changed it to:
> >
> > Allow pg_basebackup to do LZ4 and Zstandard server-side compression
> > on base backup files (Dipesh Pandit, Jeevan Ladhe)
>
> This still misses the point that those compression algs are also supported on
> the client side, so it seems misleading to mention "server-side" support.
I reworked that paragraph in the attached patch. What we did was to add
server-side gzip/LZ/ZSTD, and client-side LZ/ZSTD. (We already had
client-side gzip.) Hopefully the new text is clearer. You can see the
new output here:
https://momjian.us/pgsql_docs/release-15.html
> > > > Allow custom scan provders to indicate if they support projections
> > > > (Sven Klemm)
> > > > The default is now that custom scan providers can't support
> > > > projections, so they need to be updated for this release.
> > >
> > > Per the commit message, they don't "need" to be updated.
> > > I think this should say "The default now assumes that a custom scan
> > > provider
> > > does not support projections; to retain optimal performance, they should
> > > be
> > > updated to indicate whether that's supported.
> >
> > Okay, I went with this text:
> >
> > The default is now that custom scan providers are assumed to not
> > support projections; those that do need to be updated for this
> > release.
>
> I'd say "those that do *will need to be updated" otherwise the sentence can
> sound like it means "those that need to be updated [will] ..."
Oh, good point, done.
Cumulative patch attached.
--
Bruce Momjian <[email protected]> https://momjian.us
EDB https://enterprisedb.com
Indecision is a decision. Inaction is an action. Mark Batterson
diff --git a/doc/src/sgml/release-15.sgml b/doc/src/sgml/release-15.sgml
new file mode 100644
index dfa3c74..1cf6375
*** a/doc/src/sgml/release-15.sgml
--- b/doc/src/sgml/release-15.sgml
*************** Author: Tom Lane <[email protected]>
*** 544,551 ****
<para>
The default is now that custom scan providers are assumed to not
! support projections; those that do need to be updated for this
! release.
</para>
</listitem>
--- 544,551 ----
<para>
The default is now that custom scan providers are assumed to not
! support projections; those that do will need to be updated for
! this release.
</para>
</listitem>
*************** Author: Robert Haas <[email protected]
*** 2495,2524 ****
2022-02-11 [751b8d23b] pg_basebackup: Allow client-side LZ4 (de)compression.
Author: Robert Haas <[email protected]>
2022-03-08 [7cf085f07] Add support for zstd base backup compression.
-->
<listitem>
<para>
! Allow <application>pg_basebackup</application> to do LZ4 and
! Zstandard server-side compression on base backup files (Dipesh
! Pandit, Jeevan Ladhe)
</para>
- </listitem>
-
- <!--
- Author: Michael Paquier <[email protected]>
- 2022-01-21 [5c649fe15] Extend the options of pg_basebackup to control compressi
- Author: Robert Haas <[email protected]>
- 2022-01-24 [0ad803291] Server-side gzip compression.
- Author: Robert Haas <[email protected]>
- 2022-01-25 [e1f860f13] Tidy up a few cosmetic issues related to pg_basebackup.
- -->
- <listitem>
<para>
! Allow <application>pg_basebackup</application>'s
! <option>--compress</option> option to control the compression
! method and options (Michael Paquier, Robert Haas)
</para>
</listitem>
--- 2495,2515 ----
2022-02-11 [751b8d23b] pg_basebackup: Allow client-side LZ4 (de)compression.
Author: Robert Haas <[email protected]>
2022-03-08 [7cf085f07] Add support for zstd base backup compression.
+ Author: Robert Haas <[email protected]>
+ 2022-01-24 [0ad803291] Server-side gzip compression.
-->
<listitem>
<para>
! Allow <application>pg_basebackup</application> to do server-side
! gzip, LZ4, and Zstandard compression and client-side LZ4 and
! Zstandard compression of base backup files (Dipesh Pandit,
! Jeevan Ladhe)
</para>
<para>
! Client-side <literal>gzip</literal> compression was already
! supported.
</para>
</listitem>
*************** Author: Robert Haas <[email protected]
*** 2540,2545 ****
--- 2531,2554 ----
</para>
</listitem>
+ <!--
+ Author: Michael Paquier <[email protected]>
+ 2022-01-21 [5c649fe15] Extend the options of pg_basebackup to control compressi
+ Author: Robert Haas <[email protected]>
+ 2022-01-24 [0ad803291] Server-side gzip compression.
+ Author: Robert Haas <[email protected]>
+ 2022-01-25 [e1f860f13] Tidy up a few cosmetic issues related to pg_basebackup.
+ -->
+
+ <listitem>
+ <para>
+ Allow <application>pg_basebackup</application>'s
+ <option>--compress</option> option to control the compression
+ location (server or client), compression method, and compression
+ options (Michael Paquier, Robert Haas)
+ </para>
+ </listitem>
+
<!--
Author: Michael Paquier <[email protected]>
2021-11-05 [babbbb595] Add support for LZ4 compression in pg_receivewal
