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Commit751b8d2

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pg_basebackup: Allow client-side LZ4 (de)compression.
LZ4 compression can now be performed on the client usingpg_basebackup -Ft --compress client-lz4, and LZ4 decompression ofa backup compressed on the server can be performed on the clientusing 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
1 parentdab2984 commit751b8d2

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8 files changed

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‎doc/src/sgml/ref/pg_basebackup.sgml

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@@ -417,18 +417,14 @@ PostgreSQL documentation
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specify <literal>-Xfetch</literal>.
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</para>
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<para>
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The compression method can be set to <literal>gzip</literal> for
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compression with <application>gzip</application>, or
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<literal>lz4</literal> for compression with
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<application>lz4</application>, or <literal>none</literal> for no
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compression. However, <literal>lz4</literal> can be currently only
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used with <literal>server</literal>. A compression level can be
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optionally specified, by appending the level number after a
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colon (<literal>:</literal>). If no level is specified, the default
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compression level will be used. If only a level is specified without
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mentioning an algorithm, <literal>gzip</literal> compression will
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be used if the level is greater than 0, and no compression will be
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used if the level is 0.
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The compression method can be set to <literal>gzip</literal> or
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<literal>lz4</literal>, or <literal>none</literal> for no
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compression. A compression level can be optionally specified, by
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appending the level number after a colon (<literal>:</literal>). If no
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level is specified, the default compression level will be used. If
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only a level is specified without mentioning an algorithm,
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<literal>gzip</literal> compression will be used if the level is
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greater than 0, and no compression will be used if the level is 0.
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</para>
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<para>
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When the tar format is used with <literal>gzip</literal> or
@@ -439,6 +435,13 @@ PostgreSQL documentation
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compression. If this is done, the server will compress the backup for
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transmission, and the client will decompress and extract it.
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</para>
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<para>
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When this option is used in combination with
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<literal>-Xstream</literal>, <literal>pg_wal.tar</literal> will
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be compressed using <literal>gzip</literal> if client-side gzip
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compression is selected, but will not be compressed if server-side
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compresion or LZ4 compresion is selected.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>

‎src/bin/pg_basebackup/Makefile

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@@ -43,6 +43,7 @@ BBOBJS = \
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bbstreamer_file.o\
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bbstreamer_gzip.o\
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bbstreamer_inject.o\
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bbstreamer_lz4.o\
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bbstreamer_tar.o
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all: pg_basebackup pg_receivewal pg_recvlogical

‎src/bin/pg_basebackup/bbstreamer.h

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@@ -206,6 +206,9 @@ extern bbstreamer *bbstreamer_extractor_new(const char *basepath,
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void (*report_output_file) (constchar*));
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externbbstreamer*bbstreamer_gzip_decompressor_new(bbstreamer*next);
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externbbstreamer*bbstreamer_lz4_compressor_new(bbstreamer*next,
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intcompresslevel);
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externbbstreamer*bbstreamer_lz4_decompressor_new(bbstreamer*next);
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externbbstreamer*bbstreamer_tar_parser_new(bbstreamer*next);
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externbbstreamer*bbstreamer_tar_terminator_new(bbstreamer*next);
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externbbstreamer*bbstreamer_tar_archiver_new(bbstreamer*next);

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