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Add pg_basebackup tool for streaming base backups

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This tool makes it possible to do the pg_start_backup/
copy files/pg_stop_backup step in a single command.

There are still some steps to be done before this is a
complete backup solution, such as the ability to stream
the required WAL logs, but it's still usable, and
could do with some buildfarm coverage.

In passing, make the checkpoint request optionally
fast instead of hardcoding it.

Magnus Hagander, reviewed by Fujii Masao and Dimitri Fontaine
This commit is contained in:
Magnus Hagander
2011-01-23 12:21:23 +01:00
parent 6f59777c65
commit 048d148fe6
17 changed files with 1528 additions and 13 deletions
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19
src/backend/replication/basebackup.c
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@ -40,7 +40,7 @@ static void send_int8_string(StringInfoData *buf, int64 intval);
static void SendBackupHeader(List *tablespaces);
static void SendBackupDirectory(char *location, char *spcoid);
static void base_backup_cleanup(int code, Datum arg);
static void perform_base_backup(const char *backup_label, bool progress, DIR *tblspcdir);
static void perform_base_backup(const char *backup_label, bool progress, DIR *tblspcdir, bool fastcheckpoint);
typedef struct
{
@ -67,9 +67,9 @@ base_backup_cleanup(int code, Datum arg)
* clobbered by longjmp" from stupider versions of gcc.
*/
static void
perform_base_backup(const char *backup_label, bool progress, DIR *tblspcdir)
perform_base_backup(const char *backup_label, bool progress, DIR *tblspcdir, bool fastcheckpoint)
{
do_pg_start_backup(backup_label, true);
do_pg_start_backup(backup_label, fastcheckpoint);
PG_ENSURE_ERROR_CLEANUP(base_backup_cleanup, (Datum) 0);
{
@ -135,7 +135,7 @@ perform_base_backup(const char *backup_label, bool progress, DIR *tblspcdir)
* pg_stop_backup() for the user.
*/
void
SendBaseBackup(const char *backup_label, bool progress)
SendBaseBackup(const char *backup_label, bool progress, bool fastcheckpoint)
{
DIR *dir;
MemoryContext backup_context;
@ -168,7 +168,7 @@ SendBaseBackup(const char *backup_label, bool progress)
ereport(ERROR,
(errmsg("unable to open directory pg_tblspc: %m")));
perform_base_backup(backup_label, progress, dir);
perform_base_backup(backup_label, progress, dir, fastcheckpoint);
FreeDir(dir);
@ -333,7 +333,16 @@ sendDir(char *path, int basepathlen, bool sizeonly)
if (strcmp(pathbuf, "./pg_xlog") == 0)
{
if (!sizeonly)
{
/* If pg_xlog is a symlink, write it as a directory anyway */
#ifndef WIN32
if (S_ISLNK(statbuf.st_mode))
#else
if (pgwin32_is_junction(pathbuf))
#endif
statbuf.st_mode = S_IFDIR | S_IRWXU;
_tarWriteHeader(pathbuf + basepathlen + 1, NULL, &statbuf);
}
size += 512; /* Size of the header just added */
continue; /* don't recurse into pg_xlog */
}