Re: refactoring basebackup.c

Hi,

> On Mon, Jan 31, 2022 at 4:41 PM Jeevan Ladhe <
jeevan(dot)ladhe(at)enterprisedb(dot)com> wrote:

> Hi Robert,
>
> I had an offline discussion with Dipesh, and he will be working on the
> lz4 client side decompression part.
>

Please find the attached patch to support client side compression
and decompression using lz4.

Added a new lz4 bbstreamer to compress the archive chunks at
client if user has specified --compress=clinet-lz4:[LEVEL] option
in pg_basebackup. The new streamer accepts archive chunks
compresses it and forwards it to plain-writer.

Similarly, If a user has specified a server compressed lz4 archive
with plain format (-F p) backup then it requires decompressing
the compressed archive chunks before forwarding it to tar extractor.
Added a new bbstreamer to decompress the compressed archive
and forward it to tar extractor.

Note: This patch can be applied on Jeevan Ladhe's v12 patch
for lz4 compression.

Thanks,
Dipesh