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Map basebackup tablespaces using a tablespace_map file

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Windows can't reliably restore symbolic links from a tar format, so
instead during backup start we create a tablespace_map file, which is
used by the restoring postgres to create the correct links in pg_tblspc.
The backup protocol also now has an option to request this file to be
included in the backup stream, and this is used by pg_basebackup when
operating in tar mode.

This is done on all platforms, not just Windows.

This means that pg_basebackup will not not work in tar mode against 9.4
and older servers, as this protocol option isn't implemented there.

Amit Kapila, reviewed by Dilip Kumar, with a little editing from me.
This commit is contained in:
Andrew Dunstan
2015-05-12 09:29:10 -04:00
parent d02f16470f
commit 72d422a522
12 changed files with 519 additions and 134 deletions
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16
src/backend/replication/repl_gram.y
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@@ -71,13 +71,16 @@ Node *replication_parse_result;
%token K_NOWAIT
%token K_MAX_RATE
%token K_WAL
%token K_TABLESPACE_MAP
%token K_TIMELINE
%token K_PHYSICAL
%token K_LOGICAL
%token K_SLOT
%type <node> command
%type <node> base_backup start_replication start_logical_replication create_replication_slot drop_replication_slot identify_system timeline_history
%type <node> base_backup start_replication start_logical_replication
create_replication_slot drop_replication_slot identify_system
timeline_history
%type <list> base_backup_opt_list
%type <defelt> base_backup_opt
%type <uintval> opt_timeline
@@ -119,12 +122,14 @@ identify_system:
;
/*
* BASE_BACKUP [LABEL '<label>'] [PROGRESS] [FAST] [WAL] [NOWAIT] [MAX_RATE %d]
* BASE_BACKUP [LABEL '<label>'] [PROGRESS] [FAST] [WAL] [NOWAIT]
* [MAX_RATE %d] [TABLESPACE_MAP]
*/
base_backup:
K_BASE_BACKUP base_backup_opt_list
{
BaseBackupCmd *cmd = (BaseBackupCmd *) makeNode(BaseBackupCmd);
BaseBackupCmd *cmd =
(BaseBackupCmd *) makeNode(BaseBackupCmd);
cmd->options = $2;
$$ = (Node *) cmd;
}
@@ -168,6 +173,11 @@ base_backup_opt:
$$ = makeDefElem("max_rate",
(Node *)makeInteger($2));
}
| K_TABLESPACE_MAP
{
$$ = makeDefElem("tablespace_map",
(Node *)makeInteger(TRUE));
}
;
create_replication_slot: