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https://github.com/postgres/postgres.git
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Split off functions related to timeline history files and XLOG archiving.
This is just refactoring, to make the functions accessible outside xlog.c. A followup patch will make use of that, to allow fetching timeline history files over streaming replication.
This commit is contained in:
Heikki Linnakangas
parent
0899556e92
commit
d5497b95f3
@ -13,7 +13,8 @@ top_builddir = ../../../..
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include $(top_builddir)/src/Makefile.global
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include $(top_builddir)/src/Makefile.global
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OBJS = clog.o transam.o varsup.o xact.o rmgr.o slru.o subtrans.o multixact.o \
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OBJS = clog.o transam.o varsup.o xact.o rmgr.o slru.o subtrans.o multixact.o \
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twophase.o twophase_rmgr.o xlog.o xlogfuncs.o xlogutils.o
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timeline.o twophase.o twophase_rmgr.o xlog.o xlogarchive.o xlogfuncs.o \
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xlogutils.o
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include $(top_srcdir)/src/backend/common.mk
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include $(top_srcdir)/src/backend/common.mk
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378
src/backend/access/transam/timeline.c
Normal file
378
src/backend/access/transam/timeline.c
Normal file
@ -0,0 +1,378 @@
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/*-------------------------------------------------------------------------
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*
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* timeline.c
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* Functions for reading and writing timeline history files.
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*
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* A timeline history file lists the timeline changes of the timeline, in
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* a simple text format. They are archived along with the WAL segments.
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*
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* The files are named like "<WAL segment>.history". For example, if the
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* database starts up and switches to timeline 5, while processing WAL
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* segment 000000030000002A00000006 (the old timeline was 3), the timeline
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* history file would be called "000000050000002A00000006.history".
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*
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* Each line in the file represents a timeline switch:
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*
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* <parentTLI> <xlogfname> <reason>
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*
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* parentTLI ID of the parent timeline
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* xlogfname filename of the WAL segment where the switch happened
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* reason human-readable explanation of why the timeline was changed
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*
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* The fields are separated by tabs. Lines beginning with # are comments, and
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* are ignored. Empty lines are also ignored.
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*
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* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/backend/access/transam/timeline.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <stdio.h>
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#include <unistd.h>
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#include "access/timeline.h"
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#include "access/xlog_internal.h"
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#include "access/xlogdefs.h"
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#include "storage/fd.h"
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/*
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* Try to read a timeline's history file.
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*
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* If successful, return the list of component TLIs (the given TLI followed by
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* its ancestor TLIs). If we can't find the history file, assume that the
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* timeline has no parents, and return a list of just the specified timeline
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* ID.
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*/
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List *
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readTimeLineHistory(TimeLineID targetTLI)
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{
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List *result;
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char path[MAXPGPATH];
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char histfname[MAXFNAMELEN];
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char fline[MAXPGPATH];
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FILE *fd;
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/* Timeline 1 does not have a history file, so no need to check */
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if (targetTLI == 1)
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return list_make1_int((int) targetTLI);
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if (InArchiveRecovery)
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{
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TLHistoryFileName(histfname, targetTLI);
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RestoreArchivedFile(path, histfname, "RECOVERYHISTORY", 0);
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}
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else
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TLHistoryFilePath(path, targetTLI);
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fd = AllocateFile(path, "r");
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if (fd == NULL)
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{
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if (errno != ENOENT)
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ereport(FATAL,
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(errcode_for_file_access(),
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errmsg("could not open file \"%s\": %m", path)));
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/* Not there, so assume no parents */
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return list_make1_int((int) targetTLI);
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}
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result = NIL;
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/*
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* Parse the file...
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*/
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while (fgets(fline, sizeof(fline), fd) != NULL)
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{
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/* skip leading whitespace and check for # comment */
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char *ptr;
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char *endptr;
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TimeLineID tli;
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for (ptr = fline; *ptr; ptr++)
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{
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if (!isspace((unsigned char) *ptr))
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break;
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}
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if (*ptr == '\0' || *ptr == '#')
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continue;
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/* expect a numeric timeline ID as first field of line */
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tli = (TimeLineID) strtoul(ptr, &endptr, 0);
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if (endptr == ptr)
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ereport(FATAL,
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(errmsg("syntax error in history file: %s", fline),
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errhint("Expected a numeric timeline ID.")));
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if (result &&
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tli <= (TimeLineID) linitial_int(result))
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ereport(FATAL,
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(errmsg("invalid data in history file: %s", fline),
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errhint("Timeline IDs must be in increasing sequence.")));
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/* Build list with newest item first */
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result = lcons_int((int) tli, result);
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/* we ignore the remainder of each line */
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}
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FreeFile(fd);
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if (result &&
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targetTLI <= (TimeLineID) linitial_int(result))
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ereport(FATAL,
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(errmsg("invalid data in history file \"%s\"", path),
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errhint("Timeline IDs must be less than child timeline's ID.")));
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result = lcons_int((int) targetTLI, result);
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ereport(DEBUG3,
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(errmsg_internal("history of timeline %u is %s",
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targetTLI, nodeToString(result))));
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return result;
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}
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/*
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* Probe whether a timeline history file exists for the given timeline ID
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*/
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bool
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existsTimeLineHistory(TimeLineID probeTLI)
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{
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char path[MAXPGPATH];
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char histfname[MAXFNAMELEN];
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FILE *fd;
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/* Timeline 1 does not have a history file, so no need to check */
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if (probeTLI == 1)
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return false;
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if (InArchiveRecovery)
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{
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TLHistoryFileName(histfname, probeTLI);
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RestoreArchivedFile(path, histfname, "RECOVERYHISTORY", 0);
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}
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else
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TLHistoryFilePath(path, probeTLI);
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fd = AllocateFile(path, "r");
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if (fd != NULL)
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{
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FreeFile(fd);
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return true;
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}
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else
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{
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if (errno != ENOENT)
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ereport(FATAL,
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(errcode_for_file_access(),
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errmsg("could not open file \"%s\": %m", path)));
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return false;
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}
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}
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/*
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* Find the newest existing timeline, assuming that startTLI exists.
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*
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* Note: while this is somewhat heuristic, it does positively guarantee
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* that (result + 1) is not a known timeline, and therefore it should
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* be safe to assign that ID to a new timeline.
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*/
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TimeLineID
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findNewestTimeLine(TimeLineID startTLI)
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{
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TimeLineID newestTLI;
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TimeLineID probeTLI;
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/*
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* The algorithm is just to probe for the existence of timeline history
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* files. XXX is it useful to allow gaps in the sequence?
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*/
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newestTLI = startTLI;
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for (probeTLI = startTLI + 1;; probeTLI++)
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{
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if (existsTimeLineHistory(probeTLI))
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{
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newestTLI = probeTLI; /* probeTLI exists */
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}
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else
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{
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/* doesn't exist, assume we're done */
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break;
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}
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}
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return newestTLI;
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}
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/*
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* Create a new timeline history file.
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*
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* newTLI: ID of the new timeline
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* parentTLI: ID of its immediate parent
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* endTLI et al: ID of the last used WAL file, for annotation purposes
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* reason: human-readable explanation of why the timeline was switched
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*
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* Currently this is only used at the end recovery, and so there are no locking
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* considerations. But we should be just as tense as XLogFileInit to avoid
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* emplacing a bogus file.
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*/
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void
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writeTimeLineHistory(TimeLineID newTLI, TimeLineID parentTLI,
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TimeLineID endTLI, XLogSegNo endLogSegNo, char *reason)
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{
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char path[MAXPGPATH];
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char tmppath[MAXPGPATH];
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char histfname[MAXFNAMELEN];
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char xlogfname[MAXFNAMELEN];
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char buffer[BLCKSZ];
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int srcfd;
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int fd;
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int nbytes;
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Assert(newTLI > parentTLI); /* else bad selection of newTLI */
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/*
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* Write into a temp file name.
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*/
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snprintf(tmppath, MAXPGPATH, XLOGDIR "/xlogtemp.%d", (int) getpid());
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unlink(tmppath);
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/* do not use get_sync_bit() here --- want to fsync only at end of fill */
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fd = BasicOpenFile(tmppath, O_RDWR | O_CREAT | O_EXCL,
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S_IRUSR | S_IWUSR);
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if (fd < 0)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not create file \"%s\": %m", tmppath)));
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/*
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* If a history file exists for the parent, copy it verbatim
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*/
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if (InArchiveRecovery)
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{
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TLHistoryFileName(histfname, parentTLI);
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RestoreArchivedFile(path, histfname, "RECOVERYHISTORY", 0);
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}
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else
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TLHistoryFilePath(path, parentTLI);
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srcfd = BasicOpenFile(path, O_RDONLY, 0);
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if (srcfd < 0)
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{
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if (errno != ENOENT)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not open file \"%s\": %m", path)));
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/* Not there, so assume parent has no parents */
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}
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else
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{
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for (;;)
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{
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errno = 0;
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nbytes = (int) read(srcfd, buffer, sizeof(buffer));
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if (nbytes < 0 || errno != 0)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not read file \"%s\": %m", path)));
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if (nbytes == 0)
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break;
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errno = 0;
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if ((int) write(fd, buffer, nbytes) != nbytes)
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{
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int save_errno = errno;
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/*
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* If we fail to make the file, delete it to release disk
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* space
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*/
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unlink(tmppath);
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/*
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* if write didn't set errno, assume problem is no disk space
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*/
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errno = save_errno ? save_errno : ENOSPC;
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not write to file \"%s\": %m", tmppath)));
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}
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}
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close(srcfd);
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}
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/*
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* Append one line with the details of this timeline split.
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*
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* If we did have a parent file, insert an extra newline just in case the
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* parent file failed to end with one.
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*/
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XLogFileName(xlogfname, endTLI, endLogSegNo);
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snprintf(buffer, sizeof(buffer),
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"%s%u\t%s\t%s\n",
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(srcfd < 0) ? "" : "\n",
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parentTLI,
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xlogfname,
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reason);
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nbytes = strlen(buffer);
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errno = 0;
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if ((int) write(fd, buffer, nbytes) != nbytes)
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{
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int save_errno = errno;
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/*
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* If we fail to make the file, delete it to release disk space
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*/
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unlink(tmppath);
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/* if write didn't set errno, assume problem is no disk space */
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errno = save_errno ? save_errno : ENOSPC;
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not write to file \"%s\": %m", tmppath)));
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}
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if (pg_fsync(fd) != 0)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not fsync file \"%s\": %m", tmppath)));
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if (close(fd))
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not close file \"%s\": %m", tmppath)));
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/*
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* Now move the completed history file into place with its final name.
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*/
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TLHistoryFilePath(path, newTLI);
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/*
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* Prefer link() to rename() here just to be really sure that we don't
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* overwrite an existing logfile. However, there shouldn't be one, so
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* rename() is an acceptable substitute except for the truly paranoid.
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*/
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#if HAVE_WORKING_LINK
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if (link(tmppath, path) < 0)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not link file \"%s\" to \"%s\": %m",
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tmppath, path)));
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unlink(tmppath);
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#else
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if (rename(tmppath, path) < 0)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not rename file \"%s\" to \"%s\": %m",
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tmppath, path)));
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#endif
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}
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File diff suppressed because it is too large
Load Diff
572
src/backend/access/transam/xlogarchive.c
Normal file
572
src/backend/access/transam/xlogarchive.c
Normal file
@ -0,0 +1,572 @@
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|
/*-------------------------------------------------------------------------
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|
*
|
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|
* xlogarchive.c
|
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|
* Functions for archiving WAL files and restoring from the archive.
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*
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*
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||||||
|
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
|
||||||
|
* Portions Copyright (c) 1994, Regents of the University of California
|
||||||
|
*
|
||||||
|
* src/backend/access/transam/xlogarchive.c
|
||||||
|
*
|
||||||
|
*-------------------------------------------------------------------------
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "postgres.h"
|
||||||
|
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
#include <signal.h>
|
||||||
|
#include <unistd.h>
|
||||||
|
|
||||||
|
#include "access/xlog_internal.h"
|
||||||
|
#include "miscadmin.h"
|
||||||
|
#include "postmaster/startup.h"
|
||||||
|
#include "storage/fd.h"
|
||||||
|
#include "storage/ipc.h"
|
||||||
|
#include "storage/lwlock.h"
|
||||||
|
#include "storage/pmsignal.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Attempt to retrieve the specified file from off-line archival storage.
|
||||||
|
* If successful, fill "path" with its complete path (note that this will be
|
||||||
|
* a temp file name that doesn't follow the normal naming convention), and
|
||||||
|
* return TRUE.
|
||||||
|
*
|
||||||
|
* If not successful, fill "path" with the name of the normal on-line file
|
||||||
|
* (which may or may not actually exist, but we'll try to use it), and return
|
||||||
|
* FALSE.
|
||||||
|
*
|
||||||
|
* For fixed-size files, the caller may pass the expected size as an
|
||||||
|
* additional crosscheck on successful recovery. If the file size is not
|
||||||
|
* known, set expectedSize = 0.
|
||||||
|
*/
|
||||||
|
bool
|
||||||
|
RestoreArchivedFile(char *path, const char *xlogfname,
|
||||||
|
const char *recovername, off_t expectedSize)
|
||||||
|
{
|
||||||
|
char xlogpath[MAXPGPATH];
|
||||||
|
char xlogRestoreCmd[MAXPGPATH];
|
||||||
|
char lastRestartPointFname[MAXPGPATH];
|
||||||
|
char *dp;
|
||||||
|
char *endp;
|
||||||
|
const char *sp;
|
||||||
|
int rc;
|
||||||
|
bool signaled;
|
||||||
|
struct stat stat_buf;
|
||||||
|
XLogSegNo restartSegNo;
|
||||||
|
XLogRecPtr restartRedoPtr;
|
||||||
|
TimeLineID restartTli;
|
||||||
|
|
||||||
|
/* In standby mode, restore_command might not be supplied */
|
||||||
|
if (recoveryRestoreCommand == NULL)
|
||||||
|
goto not_available;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* When doing archive recovery, we always prefer an archived log file even
|
||||||
|
* if a file of the same name exists in XLOGDIR. The reason is that the
|
||||||
|
* file in XLOGDIR could be an old, un-filled or partly-filled version
|
||||||
|
* that was copied and restored as part of backing up $PGDATA.
|
||||||
|
*
|
||||||
|
* We could try to optimize this slightly by checking the local copy
|
||||||
|
* lastchange timestamp against the archived copy, but we have no API to
|
||||||
|
* do this, nor can we guarantee that the lastchange timestamp was
|
||||||
|
* preserved correctly when we copied to archive. Our aim is robustness,
|
||||||
|
* so we elect not to do this.
|
||||||
|
*
|
||||||
|
* If we cannot obtain the log file from the archive, however, we will try
|
||||||
|
* to use the XLOGDIR file if it exists. This is so that we can make use
|
||||||
|
* of log segments that weren't yet transferred to the archive.
|
||||||
|
*
|
||||||
|
* Notice that we don't actually overwrite any files when we copy back
|
||||||
|
* from archive because the restore_command may inadvertently
|
||||||
|
* restore inappropriate xlogs, or they may be corrupt, so we may wish to
|
||||||
|
* fallback to the segments remaining in current XLOGDIR later. The
|
||||||
|
* copy-from-archive filename is always the same, ensuring that we don't
|
||||||
|
* run out of disk space on long recoveries.
|
||||||
|
*/
|
||||||
|
snprintf(xlogpath, MAXPGPATH, XLOGDIR "/%s", recovername);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Make sure there is no existing file named recovername.
|
||||||
|
*/
|
||||||
|
if (stat(xlogpath, &stat_buf) != 0)
|
||||||
|
{
|
||||||
|
if (errno != ENOENT)
|
||||||
|
ereport(FATAL,
|
||||||
|
(errcode_for_file_access(),
|
||||||
|
errmsg("could not stat file \"%s\": %m",
|
||||||
|
xlogpath)));
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
if (unlink(xlogpath) != 0)
|
||||||
|
ereport(FATAL,
|
||||||
|
(errcode_for_file_access(),
|
||||||
|
errmsg("could not remove file \"%s\": %m",
|
||||||
|
xlogpath)));
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Calculate the archive file cutoff point for use during log shipping
|
||||||
|
* replication. All files earlier than this point can be deleted from the
|
||||||
|
* archive, though there is no requirement to do so.
|
||||||
|
*
|
||||||
|
* We initialise this with the filename of an InvalidXLogRecPtr, which
|
||||||
|
* will prevent the deletion of any WAL files from the archive because of
|
||||||
|
* the alphabetic sorting property of WAL filenames.
|
||||||
|
*
|
||||||
|
* Once we have successfully located the redo pointer of the checkpoint
|
||||||
|
* from which we start recovery we never request a file prior to the redo
|
||||||
|
* pointer of the last restartpoint. When redo begins we know that we have
|
||||||
|
* successfully located it, so there is no need for additional status
|
||||||
|
* flags to signify the point when we can begin deleting WAL files from
|
||||||
|
* the archive.
|
||||||
|
*/
|
||||||
|
GetOldestRestartPoint(&restartRedoPtr, &restartTli);
|
||||||
|
if (!XLogRecPtrIsInvalid(restartRedoPtr))
|
||||||
|
{
|
||||||
|
XLByteToSeg(restartRedoPtr, restartSegNo);
|
||||||
|
XLogFileName(lastRestartPointFname, restartTli, restartSegNo);
|
||||||
|
/* we shouldn't need anything earlier than last restart point */
|
||||||
|
Assert(strcmp(lastRestartPointFname, xlogfname) <= 0);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
XLogFileName(lastRestartPointFname, 0, 0L);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* construct the command to be executed
|
||||||
|
*/
|
||||||
|
dp = xlogRestoreCmd;
|
||||||
|
endp = xlogRestoreCmd + MAXPGPATH - 1;
|
||||||
|
*endp = '\0';
|
||||||
|
|
||||||
|
for (sp = recoveryRestoreCommand; *sp; sp++)
|
||||||
|
{
|
||||||
|
if (*sp == '%')
|
||||||
|
{
|
||||||
|
switch (sp[1])
|
||||||
|
{
|
||||||
|
case 'p':
|
||||||
|
/* %p: relative path of target file */
|
||||||
|
sp++;
|
||||||
|
StrNCpy(dp, xlogpath, endp - dp);
|
||||||
|
make_native_path(dp);
|
||||||
|
dp += strlen(dp);
|
||||||
|
break;
|
||||||
|
case 'f':
|
||||||
|
/* %f: filename of desired file */
|
||||||
|
sp++;
|
||||||
|
StrNCpy(dp, xlogfname, endp - dp);
|
||||||
|
dp += strlen(dp);
|
||||||
|
break;
|
||||||
|
case 'r':
|
||||||
|
/* %r: filename of last restartpoint */
|
||||||
|
sp++;
|
||||||
|
StrNCpy(dp, lastRestartPointFname, endp - dp);
|
||||||
|
dp += strlen(dp);
|
||||||
|
break;
|
||||||
|
case '%':
|
||||||
|
/* convert %% to a single % */
|
||||||
|
sp++;
|
||||||
|
if (dp < endp)
|
||||||
|
*dp++ = *sp;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
/* otherwise treat the % as not special */
|
||||||
|
if (dp < endp)
|
||||||
|
*dp++ = *sp;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
if (dp < endp)
|
||||||
|
*dp++ = *sp;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
*dp = '\0';
|
||||||
|
|
||||||
|
ereport(DEBUG3,
|
||||||
|
(errmsg_internal("executing restore command \"%s\"",
|
||||||
|
xlogRestoreCmd)));
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Check signals before restore command and reset afterwards.
|
||||||
|
*/
|
||||||
|
PreRestoreCommand();
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Copy xlog from archival storage to XLOGDIR
|
||||||
|
*/
|
||||||
|
rc = system(xlogRestoreCmd);
|
||||||
|
|
||||||
|
PostRestoreCommand();
|
||||||
|
|
||||||
|
if (rc == 0)
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* command apparently succeeded, but let's make sure the file is
|
||||||
|
* really there now and has the correct size.
|
||||||
|
*/
|
||||||
|
if (stat(xlogpath, &stat_buf) == 0)
|
||||||
|
{
|
||||||
|
if (expectedSize > 0 && stat_buf.st_size != expectedSize)
|
||||||
|
{
|
||||||
|
int elevel;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If we find a partial file in standby mode, we assume it's
|
||||||
|
* because it's just being copied to the archive, and keep
|
||||||
|
* trying.
|
||||||
|
*
|
||||||
|
* Otherwise treat a wrong-sized file as FATAL to ensure the
|
||||||
|
* DBA would notice it, but is that too strong? We could try
|
||||||
|
* to plow ahead with a local copy of the file ... but the
|
||||||
|
* problem is that there probably isn't one, and we'd
|
||||||
|
* incorrectly conclude we've reached the end of WAL and we're
|
||||||
|
* done recovering ...
|
||||||
|
*/
|
||||||
|
if (StandbyMode && stat_buf.st_size < expectedSize)
|
||||||
|
elevel = DEBUG1;
|
||||||
|
else
|
||||||
|
elevel = FATAL;
|
||||||
|
ereport(elevel,
|
||||||
|
(errmsg("archive file \"%s\" has wrong size: %lu instead of %lu",
|
||||||
|
xlogfname,
|
||||||
|
(unsigned long) stat_buf.st_size,
|
||||||
|
(unsigned long) expectedSize)));
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
ereport(LOG,
|
||||||
|
(errmsg("restored log file \"%s\" from archive",
|
||||||
|
xlogfname)));
|
||||||
|
strcpy(path, xlogpath);
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
/* stat failed */
|
||||||
|
if (errno != ENOENT)
|
||||||
|
ereport(FATAL,
|
||||||
|
(errcode_for_file_access(),
|
||||||
|
errmsg("could not stat file \"%s\": %m",
|
||||||
|
xlogpath)));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Remember, we rollforward UNTIL the restore fails so failure here is
|
||||||
|
* just part of the process... that makes it difficult to determine
|
||||||
|
* whether the restore failed because there isn't an archive to restore,
|
||||||
|
* or because the administrator has specified the restore program
|
||||||
|
* incorrectly. We have to assume the former.
|
||||||
|
*
|
||||||
|
* However, if the failure was due to any sort of signal, it's best to
|
||||||
|
* punt and abort recovery. (If we "return false" here, upper levels will
|
||||||
|
* assume that recovery is complete and start up the database!) It's
|
||||||
|
* essential to abort on child SIGINT and SIGQUIT, because per spec
|
||||||
|
* system() ignores SIGINT and SIGQUIT while waiting; if we see one of
|
||||||
|
* those it's a good bet we should have gotten it too.
|
||||||
|
*
|
||||||
|
* On SIGTERM, assume we have received a fast shutdown request, and exit
|
||||||
|
* cleanly. It's pure chance whether we receive the SIGTERM first, or the
|
||||||
|
* child process. If we receive it first, the signal handler will call
|
||||||
|
* proc_exit, otherwise we do it here. If we or the child process received
|
||||||
|
* SIGTERM for any other reason than a fast shutdown request, postmaster
|
||||||
|
* will perform an immediate shutdown when it sees us exiting
|
||||||
|
* unexpectedly.
|
||||||
|
*
|
||||||
|
* Per the Single Unix Spec, shells report exit status > 128 when a called
|
||||||
|
* command died on a signal. Also, 126 and 127 are used to report
|
||||||
|
* problems such as an unfindable command; treat those as fatal errors
|
||||||
|
* too.
|
||||||
|
*/
|
||||||
|
if (WIFSIGNALED(rc) && WTERMSIG(rc) == SIGTERM)
|
||||||
|
proc_exit(1);
|
||||||
|
|
||||||
|
signaled = WIFSIGNALED(rc) || WEXITSTATUS(rc) > 125;
|
||||||
|
|
||||||
|
ereport(signaled ? FATAL : DEBUG2,
|
||||||
|
(errmsg("could not restore file \"%s\" from archive: return code %d",
|
||||||
|
xlogfname, rc)));
|
||||||
|
|
||||||
|
not_available:
|
||||||
|
|
||||||
|
/*
|
||||||
|
* if an archived file is not available, there might still be a version of
|
||||||
|
* this file in XLOGDIR, so return that as the filename to open.
|
||||||
|
*
|
||||||
|
* In many recovery scenarios we expect this to fail also, but if so that
|
||||||
|
* just means we've reached the end of WAL.
|
||||||
|
*/
|
||||||
|
snprintf(path, MAXPGPATH, XLOGDIR "/%s", xlogfname);
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Attempt to execute an external shell command during recovery.
|
||||||
|
*
|
||||||
|
* 'command' is the shell command to be executed, 'commandName' is a
|
||||||
|
* human-readable name describing the command emitted in the logs. If
|
||||||
|
* 'failOnSignal' is true and the command is killed by a signal, a FATAL
|
||||||
|
* error is thrown. Otherwise a WARNING is emitted.
|
||||||
|
*
|
||||||
|
* This is currently used for recovery_end_command and archive_cleanup_command.
|
||||||
|
*/
|
||||||
|
void
|
||||||
|
ExecuteRecoveryCommand(char *command, char *commandName, bool failOnSignal)
|
||||||
|
{
|
||||||
|
char xlogRecoveryCmd[MAXPGPATH];
|
||||||
|
char lastRestartPointFname[MAXPGPATH];
|
||||||
|
char *dp;
|
||||||
|
char *endp;
|
||||||
|
const char *sp;
|
||||||
|
int rc;
|
||||||
|
bool signaled;
|
||||||
|
XLogSegNo restartSegNo;
|
||||||
|
XLogRecPtr restartRedoPtr;
|
||||||
|
TimeLineID restartTli;
|
||||||
|
|
||||||
|
Assert(command && commandName);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Calculate the archive file cutoff point for use during log shipping
|
||||||
|
* replication. All files earlier than this point can be deleted from the
|
||||||
|
* archive, though there is no requirement to do so.
|
||||||
|
*/
|
||||||
|
GetOldestRestartPoint(&restartRedoPtr, &restartTli);
|
||||||
|
XLByteToSeg(restartRedoPtr, restartSegNo);
|
||||||
|
XLogFileName(lastRestartPointFname, restartTli, restartSegNo);
|
||||||
|
LWLockRelease(ControlFileLock);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* construct the command to be executed
|
||||||
|
*/
|
||||||
|
dp = xlogRecoveryCmd;
|
||||||
|
endp = xlogRecoveryCmd + MAXPGPATH - 1;
|
||||||
|
*endp = '\0';
|
||||||
|
|
||||||
|
for (sp = command; *sp; sp++)
|
||||||
|
{
|
||||||
|
if (*sp == '%')
|
||||||
|
{
|
||||||
|
switch (sp[1])
|
||||||
|
{
|
||||||
|
case 'r':
|
||||||
|
/* %r: filename of last restartpoint */
|
||||||
|
sp++;
|
||||||
|
StrNCpy(dp, lastRestartPointFname, endp - dp);
|
||||||
|
dp += strlen(dp);
|
||||||
|
break;
|
||||||
|
case '%':
|
||||||
|
/* convert %% to a single % */
|
||||||
|
sp++;
|
||||||
|
if (dp < endp)
|
||||||
|
*dp++ = *sp;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
/* otherwise treat the % as not special */
|
||||||
|
if (dp < endp)
|
||||||
|
*dp++ = *sp;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
if (dp < endp)
|
||||||
|
*dp++ = *sp;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
*dp = '\0';
|
||||||
|
|
||||||
|
ereport(DEBUG3,
|
||||||
|
(errmsg_internal("executing %s \"%s\"", commandName, command)));
|
||||||
|
|
||||||
|
/*
|
||||||
|
* execute the constructed command
|
||||||
|
*/
|
||||||
|
rc = system(xlogRecoveryCmd);
|
||||||
|
if (rc != 0)
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* If the failure was due to any sort of signal, it's best to punt and
|
||||||
|
* abort recovery. See also detailed comments on signals in
|
||||||
|
* RestoreArchivedFile().
|
||||||
|
*/
|
||||||
|
signaled = WIFSIGNALED(rc) || WEXITSTATUS(rc) > 125;
|
||||||
|
|
||||||
|
ereport((signaled && failOnSignal) ? FATAL : WARNING,
|
||||||
|
/*------
|
||||||
|
translator: First %s represents a recovery.conf parameter name like
|
||||||
|
"recovery_end_command", and the 2nd is the value of that parameter. */
|
||||||
|
(errmsg("%s \"%s\": return code %d", commandName,
|
||||||
|
command, rc)));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* XLogArchiveNotify
|
||||||
|
*
|
||||||
|
* Create an archive notification file
|
||||||
|
*
|
||||||
|
* The name of the notification file is the message that will be picked up
|
||||||
|
* by the archiver, e.g. we write 0000000100000001000000C6.ready
|
||||||
|
* and the archiver then knows to archive XLOGDIR/0000000100000001000000C6,
|
||||||
|
* then when complete, rename it to 0000000100000001000000C6.done
|
||||||
|
*/
|
||||||
|
void
|
||||||
|
XLogArchiveNotify(const char *xlog)
|
||||||
|
{
|
||||||
|
char archiveStatusPath[MAXPGPATH];
|
||||||
|
FILE *fd;
|
||||||
|
|
||||||
|
/* insert an otherwise empty file called <XLOG>.ready */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".ready");
|
||||||
|
fd = AllocateFile(archiveStatusPath, "w");
|
||||||
|
if (fd == NULL)
|
||||||
|
{
|
||||||
|
ereport(LOG,
|
||||||
|
(errcode_for_file_access(),
|
||||||
|
errmsg("could not create archive status file \"%s\": %m",
|
||||||
|
archiveStatusPath)));
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
if (FreeFile(fd))
|
||||||
|
{
|
||||||
|
ereport(LOG,
|
||||||
|
(errcode_for_file_access(),
|
||||||
|
errmsg("could not write archive status file \"%s\": %m",
|
||||||
|
archiveStatusPath)));
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Notify archiver that it's got something to do */
|
||||||
|
if (IsUnderPostmaster)
|
||||||
|
SendPostmasterSignal(PMSIGNAL_WAKEN_ARCHIVER);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Convenience routine to notify using segment number representation of filename
|
||||||
|
*/
|
||||||
|
void
|
||||||
|
XLogArchiveNotifySeg(XLogSegNo segno)
|
||||||
|
{
|
||||||
|
char xlog[MAXFNAMELEN];
|
||||||
|
|
||||||
|
XLogFileName(xlog, ThisTimeLineID, segno);
|
||||||
|
XLogArchiveNotify(xlog);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* XLogArchiveCheckDone
|
||||||
|
*
|
||||||
|
* This is called when we are ready to delete or recycle an old XLOG segment
|
||||||
|
* file or backup history file. If it is okay to delete it then return true.
|
||||||
|
* If it is not time to delete it, make sure a .ready file exists, and return
|
||||||
|
* false.
|
||||||
|
*
|
||||||
|
* If <XLOG>.done exists, then return true; else if <XLOG>.ready exists,
|
||||||
|
* then return false; else create <XLOG>.ready and return false.
|
||||||
|
*
|
||||||
|
* The reason we do things this way is so that if the original attempt to
|
||||||
|
* create <XLOG>.ready fails, we'll retry during subsequent checkpoints.
|
||||||
|
*/
|
||||||
|
bool
|
||||||
|
XLogArchiveCheckDone(const char *xlog)
|
||||||
|
{
|
||||||
|
char archiveStatusPath[MAXPGPATH];
|
||||||
|
struct stat stat_buf;
|
||||||
|
|
||||||
|
/* Always deletable if archiving is off */
|
||||||
|
if (!XLogArchivingActive())
|
||||||
|
return true;
|
||||||
|
|
||||||
|
/* First check for .done --- this means archiver is done with it */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".done");
|
||||||
|
if (stat(archiveStatusPath, &stat_buf) == 0)
|
||||||
|
return true;
|
||||||
|
|
||||||
|
/* check for .ready --- this means archiver is still busy with it */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".ready");
|
||||||
|
if (stat(archiveStatusPath, &stat_buf) == 0)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
/* Race condition --- maybe archiver just finished, so recheck */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".done");
|
||||||
|
if (stat(archiveStatusPath, &stat_buf) == 0)
|
||||||
|
return true;
|
||||||
|
|
||||||
|
/* Retry creation of the .ready file */
|
||||||
|
XLogArchiveNotify(xlog);
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* XLogArchiveIsBusy
|
||||||
|
*
|
||||||
|
* Check to see if an XLOG segment file is still unarchived.
|
||||||
|
* This is almost but not quite the inverse of XLogArchiveCheckDone: in
|
||||||
|
* the first place we aren't chartered to recreate the .ready file, and
|
||||||
|
* in the second place we should consider that if the file is already gone
|
||||||
|
* then it's not busy. (This check is needed to handle the race condition
|
||||||
|
* that a checkpoint already deleted the no-longer-needed file.)
|
||||||
|
*/
|
||||||
|
bool
|
||||||
|
XLogArchiveIsBusy(const char *xlog)
|
||||||
|
{
|
||||||
|
char archiveStatusPath[MAXPGPATH];
|
||||||
|
struct stat stat_buf;
|
||||||
|
|
||||||
|
/* First check for .done --- this means archiver is done with it */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".done");
|
||||||
|
if (stat(archiveStatusPath, &stat_buf) == 0)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
/* check for .ready --- this means archiver is still busy with it */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".ready");
|
||||||
|
if (stat(archiveStatusPath, &stat_buf) == 0)
|
||||||
|
return true;
|
||||||
|
|
||||||
|
/* Race condition --- maybe archiver just finished, so recheck */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".done");
|
||||||
|
if (stat(archiveStatusPath, &stat_buf) == 0)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Check to see if the WAL file has been removed by checkpoint, which
|
||||||
|
* implies it has already been archived, and explains why we can't see a
|
||||||
|
* status file for it.
|
||||||
|
*/
|
||||||
|
snprintf(archiveStatusPath, MAXPGPATH, XLOGDIR "/%s", xlog);
|
||||||
|
if (stat(archiveStatusPath, &stat_buf) != 0 &&
|
||||||
|
errno == ENOENT)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* XLogArchiveCleanup
|
||||||
|
*
|
||||||
|
* Cleanup archive notification file(s) for a particular xlog segment
|
||||||
|
*/
|
||||||
|
void
|
||||||
|
XLogArchiveCleanup(const char *xlog)
|
||||||
|
{
|
||||||
|
char archiveStatusPath[MAXPGPATH];
|
||||||
|
|
||||||
|
/* Remove the .done file */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".done");
|
||||||
|
unlink(archiveStatusPath);
|
||||||
|
/* should we complain about failure? */
|
||||||
|
|
||||||
|
/* Remove the .ready file if present --- normally it shouldn't be */
|
||||||
|
StatusFilePath(archiveStatusPath, xlog, ".ready");
|
||||||
|
unlink(archiveStatusPath);
|
||||||
|
/* should we complain about failure? */
|
||||||
|
}
|
||||||
23
src/include/access/timeline.h
Normal file
23
src/include/access/timeline.h
Normal file
@ -0,0 +1,23 @@
|
|||||||
|
/*
|
||||||
|
* timeline.h
|
||||||
|
*
|
||||||
|
* Functions for reading and writing timeline history files.
|
||||||
|
*
|
||||||
|
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
|
||||||
|
* Portions Copyright (c) 1994, Regents of the University of California
|
||||||
|
*
|
||||||
|
* src/include/access/timeline.h
|
||||||
|
*/
|
||||||
|
#ifndef TIMELINE_H
|
||||||
|
#define TIMELINE_H
|
||||||
|
|
||||||
|
#include "access/xlogdefs.h"
|
||||||
|
#include "nodes/pg_list.h"
|
||||||
|
|
||||||
|
extern List *readTimeLineHistory(TimeLineID targetTLI);
|
||||||
|
extern bool existsTimeLineHistory(TimeLineID probeTLI);
|
||||||
|
extern TimeLineID findNewestTimeLine(TimeLineID startTLI);
|
||||||
|
extern void writeTimeLineHistory(TimeLineID newTLI, TimeLineID parentTLI,
|
||||||
|
TimeLineID endTLI, XLogSegNo endLogSegNo, char *reason);
|
||||||
|
|
||||||
|
#endif /* TIMELINE_H */
|
||||||
@ -229,6 +229,29 @@ extern const RmgrData RmgrTable[];
|
|||||||
extern pg_time_t GetLastSegSwitchTime(void);
|
extern pg_time_t GetLastSegSwitchTime(void);
|
||||||
extern XLogRecPtr RequestXLogSwitch(void);
|
extern XLogRecPtr RequestXLogSwitch(void);
|
||||||
|
|
||||||
|
extern void GetOldestRestartPoint(XLogRecPtr *oldrecptr, TimeLineID *oldtli);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Exported for the functions in timeline.c and xlogarchive.c. Only valid
|
||||||
|
* in the startup process.
|
||||||
|
*/
|
||||||
|
extern bool InArchiveRecovery;
|
||||||
|
extern bool StandbyMode;
|
||||||
|
extern char *recoveryRestoreCommand;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Prototypes for functions in xlogarchive.c
|
||||||
|
*/
|
||||||
|
extern bool RestoreArchivedFile(char *path, const char *xlogfname,
|
||||||
|
const char *recovername, off_t expectedSize);
|
||||||
|
extern void ExecuteRecoveryCommand(char *command, char *commandName,
|
||||||
|
bool failOnerror);
|
||||||
|
extern void XLogArchiveNotify(const char *xlog);
|
||||||
|
extern void XLogArchiveNotifySeg(XLogSegNo segno);
|
||||||
|
extern bool XLogArchiveCheckDone(const char *xlog);
|
||||||
|
extern bool XLogArchiveIsBusy(const char *xlog);
|
||||||
|
extern void XLogArchiveCleanup(const char *xlog);
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* These aren't in xlog.h because I'd rather not include fmgr.h there.
|
* These aren't in xlog.h because I'd rather not include fmgr.h there.
|
||||||
*/
|
*/
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user