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pg_basebackup: Allow client-side LZ4 (de)compression.

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LZ4 compression can now be performed on the client using
pg_basebackup -Ft --compress client-lz4, and LZ4 decompression of
a backup compressed on the server can be performed on the client
using pg_basebackup -Fp --compress server-lz4.

Dipesh Pandit, reviewed and tested by Jeevan Ladhe and Tushar Ahuja,
with a few corrections - and some documentation - by me.

Discussion: http://postgr.es/m/CAN1g5_FeDmiA9D8wdG2W6Lkq5CpubxOAqTmd2et9hsinTJtsMQ@mail.gmail.com
This commit is contained in:
Robert Haas
2022-02-11 09:41:42 -05:00
parent dab298471f
commit 751b8d23b7
8 changed files with 606 additions and 19 deletions
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27
doc/src/sgml/ref/pg_basebackup.sgml
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@ -417,18 +417,14 @@ PostgreSQL documentation
specify <literal>-Xfetch</literal>.
</para>
<para>
The compression method can be set to <literal>gzip</literal> for
compression with <application>gzip</application>, or
<literal>lz4</literal> for compression with
<application>lz4</application>, or <literal>none</literal> for no
compression. However, <literal>lz4</literal> can be currently only
used with <literal>server</literal>. A compression level can be
optionally specified, by appending the level number after a
colon (<literal>:</literal>). If no level is specified, the default
compression level will be used. If only a level is specified without
mentioning an algorithm, <literal>gzip</literal> compression will
be used if the level is greater than 0, and no compression will be
used if the level is 0.
The compression method can be set to <literal>gzip</literal> or
<literal>lz4</literal>, or <literal>none</literal> for no
compression. A compression level can be optionally specified, by
appending the level number after a colon (<literal>:</literal>). If no
level is specified, the default compression level will be used. If
only a level is specified without mentioning an algorithm,
<literal>gzip</literal> compression will be used if the level is
greater than 0, and no compression will be used if the level is 0.
</para>
<para>
When the tar format is used with <literal>gzip</literal> or
@ -439,6 +435,13 @@ PostgreSQL documentation
compression. If this is done, the server will compress the backup for
transmission, and the client will decompress and extract it.
</para>
<para>
When this option is used in combination with
<literal>-Xstream</literal>, <literal>pg_wal.tar</literal> will
be compressed using <literal>gzip</literal> if client-side gzip
compression is selected, but will not be compressed if server-side
compresion or LZ4 compresion is selected.
</para>
</listitem>
</varlistentry>
</variablelist>