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Invent WAL timelines, as per recent discussion, to make point-in-time

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recovery more manageable.  Also, undo recent change to add FILE_HEADER
and WASTED_SPACE records to XLOG; instead make the XLOG page header
variable-size with extra fields in the first page of an XLOG file.
This should fix the boundary-case bugs observed by Mark Kirkwood.
initdb forced due to change of XLOG representation.
This commit is contained in:
Tom Lane
2004-07-21 22:31:26 +00:00
parent 8d3517dc1f
commit 2042b3428d
26 changed files with 1322 additions and 982 deletions
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36
src/backend/postmaster/pgarch.c
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@@ -19,7 +19,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/postmaster/pgarch.c,v 1.1 2004/07/19 02:47:08 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgarch.c,v 1.2 2004/07/21 22:31:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -31,9 +31,10 @@
#include <sys/time.h>
#include <unistd.h>
#include "postmaster/pgarch.h"
#include "access/xlog_internal.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "postmaster/pgarch.h"
#include "postmaster/postmaster.h"
#include "storage/fd.h"
#include "storage/ipc.h"
@@ -63,8 +64,8 @@
* ----------
*/
#define MIN_XFN_CHARS 16
#define MAX_XFN_CHARS 16
#define VALID_XFN_CHARS "0123456789ABCDEF"
#define MAX_XFN_CHARS 24
#define VALID_XFN_CHARS "0123456789ABCDEF.history"
#define NUM_ARCHIVE_RETRIES 3
@@ -73,8 +74,6 @@
* Local data
* ----------
*/
static char XLogDir[MAXPGPATH];
static char XLogArchiveStatusDir[MAXPGPATH];
static time_t last_pgarch_start_time;
/*
@@ -265,9 +264,8 @@ PgArchiverMain(int argc, char *argv[])
init_ps_display("archiver process", "", "");
set_ps_display("");
/* Init XLOG file paths */
snprintf(XLogDir, MAXPGPATH, "%s/pg_xlog", DataDir);
snprintf(XLogArchiveStatusDir, MAXPGPATH, "%s/archive_status", XLogDir);
/* Init XLOG file paths --- needed in EXEC_BACKEND case */
XLOGPathInit();
pgarch_MainLoop();
@@ -497,6 +495,12 @@ pgarch_archiveXlog(char *xlog)
* 1) to maintain the sequential chain of xlogs required for recovery
* 2) because the oldest ones will sooner become candidates for
* recycling at time of checkpoint
*
* NOTE: the "oldest" comparison will presently consider all segments of
* a timeline with a smaller ID to be older than all segments of a timeline
* with a larger ID; the net result being that past timelines are given
* higher priority for archiving. This seems okay, or at least not
* obviously worth changing.
*/
static bool
pgarch_readyXlog(char *xlog)
@@ -507,11 +511,13 @@ pgarch_readyXlog(char *xlog)
* It is possible to optimise this code, though only a single
* file is expected on the vast majority of calls, so....
*/
char XLogArchiveStatusDir[MAXPGPATH];
char newxlog[MAX_XFN_CHARS + 6 + 1];
DIR *rldir;
struct dirent *rlde;
bool found = false;
snprintf(XLogArchiveStatusDir, MAXPGPATH, "%s/archive_status", XLogDir);
rldir = AllocateDir(XLogArchiveStatusDir);
if (rldir == NULL)
ereport(ERROR,
@@ -575,14 +581,12 @@ pgarch_archiveDone(char *xlog)
{
char rlogready[MAXPGPATH];
char rlogdone[MAXPGPATH];
int rc;
snprintf(rlogready, MAXPGPATH, "%s/%s.ready", XLogArchiveStatusDir, xlog);
snprintf(rlogdone, MAXPGPATH, "%s/%s.done", XLogArchiveStatusDir, xlog);
rc = rename(rlogready, rlogdone);
if (rc < 0)
StatusFilePath(rlogready, xlog, ".ready");
StatusFilePath(rlogdone, xlog, ".done");
if (rename(rlogready, rlogdone) < 0)
ereport(WARNING,
(errcode_for_file_access(),
errmsg("could not rename \"%s\": %m",
rlogready)));
errmsg("could not rename \"%s\" to \"%s\": %m",
rlogready, rlogdone)));
}