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https://git.postgresql.org/git/postgresql.git
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f0eb3e5e58
parameter. This fixes bug 4137 reported by Wojciech Strzalka, where a WAL file is deleted too early when starting the recovery of a warm standby server. Also add a sanity check in pg_standby so that it will refuse to delete anything earlier than the file being restored, and improve the debug message in case nothing is deleted. Simon Riggs. Backpatch to 8.3, which is where %r was introduced.
683 lines
17 KiB
C
683 lines
17 KiB
C
/*
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* pg_standby.c
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*
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* Production-ready example of how to create a Warm Standby
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* database server using continuous archiving as a
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* replication mechanism
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*
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* We separate the parameters for archive and nextWALfile
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* so that we can check the archive exists, even if the
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* WAL file doesn't (yet).
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*
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* This program will be executed once in full for each file
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* requested by the warm standby server.
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*
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* It is designed to cater to a variety of needs, as well
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* providing a customizable section.
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*
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* Original author: Simon Riggs simon@2ndquadrant.com
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* Current maintainer: Simon Riggs
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*/
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#include "postgres_fe.h"
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#include <ctype.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <signal.h>
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#ifdef WIN32
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int getopt(int argc, char *const argv[], const char *optstring);
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#else
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#include <sys/time.h>
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#include <unistd.h>
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#endif
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#endif /* ! WIN32 */
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extern char *optarg;
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extern int optind;
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/* Options and defaults */
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int sleeptime = 5; /* amount of time to sleep between file checks */
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int waittime = -1; /* how long we have been waiting, -1 no wait
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* yet */
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int maxwaittime = 0; /* how long are we prepared to wait for? */
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int keepfiles = 0; /* number of WAL files to keep, 0 keep all */
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int maxretries = 3; /* number of retries on restore command */
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bool debug = false; /* are we debugging? */
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bool triggered = false; /* have we been triggered? */
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bool need_cleanup = false; /* do we need to remove files from
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* archive? */
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static volatile sig_atomic_t signaled = false;
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char *archiveLocation; /* where to find the archive? */
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char *triggerPath; /* where to find the trigger file? */
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char *xlogFilePath; /* where we are going to restore to */
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char *nextWALFileName; /* the file we need to get from archive */
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char *restartWALFileName; /* the file from which we can restart restore */
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char *priorWALFileName; /* the file we need to get from archive */
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char WALFilePath[MAXPGPATH]; /* the file path including archive */
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char restoreCommand[MAXPGPATH]; /* run this to restore */
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char exclusiveCleanupFileName[MAXPGPATH]; /* the file we need to
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* get from archive */
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#define RESTORE_COMMAND_COPY 0
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#define RESTORE_COMMAND_LINK 1
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int restoreCommandType;
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#define XLOG_DATA 0
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#define XLOG_HISTORY 1
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#define XLOG_BACKUP_LABEL 2
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int nextWALFileType;
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#define SET_RESTORE_COMMAND(cmd, arg1, arg2) \
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snprintf(restoreCommand, MAXPGPATH, cmd " \"%s\" \"%s\"", arg1, arg2)
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struct stat stat_buf;
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/* =====================================================================
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*
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* Customizable section
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*
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* =====================================================================
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*
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* Currently, this section assumes that the Archive is a locally
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* accessible directory. If you want to make other assumptions,
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* such as using a vendor-specific archive and access API, these
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* routines are the ones you'll need to change. You're
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* enouraged to submit any changes to pgsql-patches@postgresql.org
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* or personally to the current maintainer. Those changes may be
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* folded in to later versions of this program.
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*/
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#define XLOG_DATA_FNAME_LEN 24
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/* Reworked from access/xlog_internal.h */
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#define XLogFileName(fname, tli, log, seg) \
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snprintf(fname, XLOG_DATA_FNAME_LEN + 1, "%08X%08X%08X", tli, log, seg)
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/*
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* Initialize allows customized commands into the warm standby program.
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*
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* As an example, and probably the common case, we use either
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* cp/ln commands on *nix, or copy/move command on Windows.
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*
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*/
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static void
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CustomizableInitialize(void)
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{
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#ifdef WIN32
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snprintf(WALFilePath, MAXPGPATH, "%s\\%s", archiveLocation, nextWALFileName);
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switch (restoreCommandType)
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{
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case RESTORE_COMMAND_LINK:
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SET_RESTORE_COMMAND("mklink", WALFilePath, xlogFilePath);
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case RESTORE_COMMAND_COPY:
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default:
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SET_RESTORE_COMMAND("copy", WALFilePath, xlogFilePath);
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break;
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}
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#else
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snprintf(WALFilePath, MAXPGPATH, "%s/%s", archiveLocation, nextWALFileName);
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switch (restoreCommandType)
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{
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case RESTORE_COMMAND_LINK:
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#if HAVE_WORKING_LINK
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SET_RESTORE_COMMAND("ln -s -f", WALFilePath, xlogFilePath);
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break;
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#endif
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case RESTORE_COMMAND_COPY:
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default:
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SET_RESTORE_COMMAND("cp", WALFilePath, xlogFilePath);
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break;
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}
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#endif
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/*
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* This code assumes that archiveLocation is a directory You may wish to
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* add code to check for tape libraries, etc.. So, since it is a
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* directory, we use stat to test if its accessible
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*/
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if (stat(archiveLocation, &stat_buf) != 0)
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{
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fprintf(stderr, "pg_standby: archiveLocation \"%s\" does not exist\n", archiveLocation);
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fflush(stderr);
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exit(2);
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}
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}
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/*
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* CustomizableNextWALFileReady()
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*
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* Is the requested file ready yet?
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*/
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static bool
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CustomizableNextWALFileReady()
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{
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if (stat(WALFilePath, &stat_buf) == 0)
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{
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/*
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* If its a backup file, return immediately If its a regular file
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* return only if its the right size already
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*/
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if (strlen(nextWALFileName) > 24 &&
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strspn(nextWALFileName, "0123456789ABCDEF") == 24 &&
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strcmp(nextWALFileName + strlen(nextWALFileName) - strlen(".backup"),
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".backup") == 0)
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{
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nextWALFileType = XLOG_BACKUP_LABEL;
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return true;
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}
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else if (stat_buf.st_size == XLOG_SEG_SIZE)
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{
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#ifdef WIN32
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/*
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* Windows reports that the file has the right number of bytes
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* even though the file is still being copied and cannot be opened
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* by pg_standby yet. So we wait for sleeptime secs before
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* attempting to restore. If that is not enough, we will rely on
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* the retry/holdoff mechanism.
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*/
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pg_usleep(sleeptime * 1000000L);
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#endif
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nextWALFileType = XLOG_DATA;
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return true;
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}
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/*
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* If still too small, wait until it is the correct size
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*/
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if (stat_buf.st_size > XLOG_SEG_SIZE)
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{
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if (debug)
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{
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fprintf(stderr, "file size greater than expected\n");
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fflush(stderr);
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}
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exit(3);
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}
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}
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return false;
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}
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#define MaxSegmentsPerLogFile ( 0xFFFFFFFF / XLOG_SEG_SIZE )
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static void
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CustomizableCleanupPriorWALFiles(void)
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{
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/*
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* Work out name of prior file from current filename
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*/
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if (nextWALFileType == XLOG_DATA)
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{
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int rc;
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DIR *xldir;
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struct dirent *xlde;
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/*
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* Assume its OK to keep failing. The failure situation may change
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* over time, so we'd rather keep going on the main processing than
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* fail because we couldnt clean up yet.
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*/
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if ((xldir = opendir(archiveLocation)) != NULL)
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{
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while ((xlde = readdir(xldir)) != NULL)
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{
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/*
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* We ignore the timeline part of the XLOG segment identifiers
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* in deciding whether a segment is still needed. This
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* ensures that we won't prematurely remove a segment from a
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* parent timeline. We could probably be a little more
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* proactive about removing segments of non-parent timelines,
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* but that would be a whole lot more complicated.
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*
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* We use the alphanumeric sorting property of the filenames
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* to decide which ones are earlier than the
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* exclusiveCleanupFileName file. Note that this means files
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* are not removed in the order they were originally written,
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* in case this worries you.
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*/
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if (strlen(xlde->d_name) == XLOG_DATA_FNAME_LEN &&
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strspn(xlde->d_name, "0123456789ABCDEF") == XLOG_DATA_FNAME_LEN &&
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strcmp(xlde->d_name + 8, exclusiveCleanupFileName + 8) < 0)
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{
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#ifdef WIN32
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snprintf(WALFilePath, MAXPGPATH, "%s\\%s", archiveLocation, xlde->d_name);
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#else
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snprintf(WALFilePath, MAXPGPATH, "%s/%s", archiveLocation, xlde->d_name);
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#endif
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if (debug)
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fprintf(stderr, "\nremoving \"%s\"", WALFilePath);
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rc = unlink(WALFilePath);
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if (rc != 0)
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{
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fprintf(stderr, "\npg_standby: ERROR failed to remove \"%s\": %s",
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WALFilePath, strerror(errno));
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break;
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}
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}
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}
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if (debug)
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fprintf(stderr, "\n");
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}
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else
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fprintf(stderr, "pg_standby: archiveLocation \"%s\" open error\n", archiveLocation);
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closedir(xldir);
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fflush(stderr);
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}
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}
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/* =====================================================================
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* End of Customizable section
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* =====================================================================
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*/
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/*
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* SetWALFileNameForCleanup()
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*
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* Set the earliest WAL filename that we want to keep on the archive
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* and decide whether we need_cleanup
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*/
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static bool
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SetWALFileNameForCleanup(void)
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{
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uint32 tli = 1,
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log = 0,
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seg = 0;
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uint32 log_diff = 0,
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seg_diff = 0;
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bool cleanup = false;
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if (restartWALFileName)
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{
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/*
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* Don't do cleanup if the restartWALFileName provided
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* is later than the xlog file requested. This is an error
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* and we must not remove these files from archive.
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* This shouldn't happen, but better safe than sorry.
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*/
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if (strcmp(restartWALFileName, nextWALFileName) > 0)
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return false;
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strcpy(exclusiveCleanupFileName, restartWALFileName);
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return true;
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}
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if (keepfiles > 0)
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{
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sscanf(nextWALFileName, "%08X%08X%08X", &tli, &log, &seg);
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if (tli > 0 && log >= 0 && seg > 0)
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{
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log_diff = keepfiles / MaxSegmentsPerLogFile;
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seg_diff = keepfiles % MaxSegmentsPerLogFile;
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if (seg_diff > seg)
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{
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log_diff++;
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seg = MaxSegmentsPerLogFile - seg_diff;
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}
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else
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seg -= seg_diff;
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if (log >= log_diff)
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{
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log -= log_diff;
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cleanup = true;
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}
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else
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{
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log = 0;
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seg = 0;
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}
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}
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}
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XLogFileName(exclusiveCleanupFileName, tli, log, seg);
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return cleanup;
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}
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/*
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* CheckForExternalTrigger()
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*
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* Is there a trigger file?
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*/
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static bool
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CheckForExternalTrigger(void)
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{
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int rc;
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/*
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* Look for a trigger file, if that option has been selected
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*
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* We use stat() here because triggerPath is always a file rather than
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* potentially being in an archive
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*/
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if (triggerPath && stat(triggerPath, &stat_buf) == 0)
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{
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fprintf(stderr, "trigger file found\n");
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fflush(stderr);
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/*
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* If trigger file found, we *must* delete it. Here's why: When
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* recovery completes, we will be asked again for the same file from
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* the archive using pg_standby so must remove trigger file so we can
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* reload file again and come up correctly.
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*/
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rc = unlink(triggerPath);
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if (rc != 0)
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{
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fprintf(stderr, "\n ERROR: could not remove \"%s\": %s", triggerPath, strerror(errno));
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fflush(stderr);
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exit(rc);
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}
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return true;
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}
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return false;
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}
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/*
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* RestoreWALFileForRecovery()
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*
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* Perform the action required to restore the file from archive
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*/
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static bool
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RestoreWALFileForRecovery(void)
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{
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int rc = 0;
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int numretries = 0;
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if (debug)
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{
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fprintf(stderr, "\nrunning restore :");
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fflush(stderr);
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}
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while (numretries < maxretries)
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{
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rc = system(restoreCommand);
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if (rc == 0)
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{
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if (debug)
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{
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fprintf(stderr, " OK");
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fflush(stderr);
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}
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return true;
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}
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pg_usleep(numretries++ * sleeptime * 1000000L);
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}
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/*
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* Allow caller to add additional info
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*/
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if (debug)
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fprintf(stderr, "not restored : ");
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return false;
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}
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static void
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usage(void)
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{
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fprintf(stderr, "\npg_standby allows Warm Standby servers to be configured\n");
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fprintf(stderr, "Usage:\n");
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fprintf(stderr, " pg_standby [OPTION]... ARCHIVELOCATION NEXTWALFILE XLOGFILEPATH [RESTARTWALFILE]\n");
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fprintf(stderr, " note space between ARCHIVELOCATION and NEXTWALFILE\n");
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fprintf(stderr, "with main intended use as a restore_command in the recovery.conf\n");
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fprintf(stderr, " restore_command = 'pg_standby [OPTION]... ARCHIVELOCATION %%f %%p %%r'\n");
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fprintf(stderr, "e.g. restore_command = 'pg_standby -l /mnt/server/archiverdir %%f %%p %%r'\n");
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fprintf(stderr, "\nOptions:\n");
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fprintf(stderr, " -c copies file from archive (default)\n");
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fprintf(stderr, " -d generate lots of debugging output (testing only)\n");
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fprintf(stderr, " -k NUMFILESTOKEEP if RESTARTWALFILE not used, removes files prior to limit (0 keeps all)\n");
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fprintf(stderr, " -l links into archive (leaves file in archive)\n");
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fprintf(stderr, " -r MAXRETRIES max number of times to retry, with progressive wait (default=3)\n");
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fprintf(stderr, " -s SLEEPTIME seconds to wait between file checks (min=1, max=60, default=5)\n");
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fprintf(stderr, " -t TRIGGERFILE defines a trigger file to initiate failover (no default)\n");
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fprintf(stderr, " -w MAXWAITTIME max seconds to wait for a file (0=no limit)(default=0)\n");
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fflush(stderr);
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}
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static void
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sighandler(int sig)
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{
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signaled = true;
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}
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/*------------ MAIN ----------------------------------------*/
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int
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main(int argc, char **argv)
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{
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int c;
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(void) signal(SIGINT, sighandler);
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(void) signal(SIGQUIT, sighandler);
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while ((c = getopt(argc, argv, "cdk:lr:s:t:w:")) != -1)
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{
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switch (c)
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{
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case 'c': /* Use copy */
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restoreCommandType = RESTORE_COMMAND_COPY;
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break;
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case 'd': /* Debug mode */
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debug = true;
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break;
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case 'k': /* keepfiles */
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keepfiles = atoi(optarg);
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if (keepfiles < 0)
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{
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fprintf(stderr, "usage: pg_standby -k keepfiles must be >= 0\n");
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usage();
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exit(2);
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}
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break;
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case 'l': /* Use link */
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restoreCommandType = RESTORE_COMMAND_LINK;
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break;
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case 'r': /* Retries */
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maxretries = atoi(optarg);
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if (maxretries < 0)
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{
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fprintf(stderr, "usage: pg_standby -r maxretries must be >= 0\n");
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usage();
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exit(2);
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}
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break;
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case 's': /* Sleep time */
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sleeptime = atoi(optarg);
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if (sleeptime <= 0 || sleeptime > 60)
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{
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fprintf(stderr, "usage: pg_standby -s sleeptime incorrectly set\n");
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usage();
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exit(2);
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}
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break;
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case 't': /* Trigger file */
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triggerPath = optarg;
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if (CheckForExternalTrigger())
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exit(1); /* Normal exit, with non-zero */
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break;
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case 'w': /* Max wait time */
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maxwaittime = atoi(optarg);
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if (maxwaittime < 0)
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{
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fprintf(stderr, "usage: pg_standby -w maxwaittime incorrectly set\n");
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usage();
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exit(2);
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}
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break;
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default:
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usage();
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exit(2);
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break;
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}
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}
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/*
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* Parameter checking - after checking to see if trigger file present
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*/
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if (argc == 1)
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{
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usage();
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exit(2);
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}
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/*
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* We will go to the archiveLocation to get nextWALFileName.
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* nextWALFileName may not exist yet, which would not be an error, so we
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* separate the archiveLocation and nextWALFileName so we can check
|
|
* separately whether archiveLocation exists, if not that is an error
|
|
*/
|
|
if (optind < argc)
|
|
{
|
|
archiveLocation = argv[optind];
|
|
optind++;
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "pg_standby: must specify archiveLocation\n");
|
|
usage();
|
|
exit(2);
|
|
}
|
|
|
|
if (optind < argc)
|
|
{
|
|
nextWALFileName = argv[optind];
|
|
optind++;
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "pg_standby: use %%f to specify nextWALFileName\n");
|
|
usage();
|
|
exit(2);
|
|
}
|
|
|
|
if (optind < argc)
|
|
{
|
|
xlogFilePath = argv[optind];
|
|
optind++;
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "pg_standby: use %%p to specify xlogFilePath\n");
|
|
usage();
|
|
exit(2);
|
|
}
|
|
|
|
if (optind < argc)
|
|
{
|
|
restartWALFileName = argv[optind];
|
|
optind++;
|
|
}
|
|
|
|
CustomizableInitialize();
|
|
|
|
need_cleanup = SetWALFileNameForCleanup();
|
|
|
|
if (debug)
|
|
{
|
|
fprintf(stderr, "\nTrigger file : %s", triggerPath ? triggerPath : "<not set>");
|
|
fprintf(stderr, "\nWaiting for WAL file : %s", nextWALFileName);
|
|
fprintf(stderr, "\nWAL file path : %s", WALFilePath);
|
|
fprintf(stderr, "\nRestoring to... : %s", xlogFilePath);
|
|
fprintf(stderr, "\nSleep interval : %d second%s",
|
|
sleeptime, (sleeptime > 1 ? "s" : " "));
|
|
fprintf(stderr, "\nMax wait interval : %d %s",
|
|
maxwaittime, (maxwaittime > 0 ? "seconds" : "forever"));
|
|
fprintf(stderr, "\nCommand for restore : %s", restoreCommand);
|
|
fprintf(stderr, "\nKeep archive history : ");
|
|
if (need_cleanup)
|
|
fprintf(stderr, "%s and later", exclusiveCleanupFileName);
|
|
else
|
|
fprintf(stderr, "No cleanup required");
|
|
fflush(stderr);
|
|
}
|
|
|
|
/*
|
|
* Check for initial history file: always the first file to be requested
|
|
* It's OK if the file isn't there - all other files need to wait
|
|
*/
|
|
if (strlen(nextWALFileName) > 8 &&
|
|
strspn(nextWALFileName, "0123456789ABCDEF") == 8 &&
|
|
strcmp(nextWALFileName + strlen(nextWALFileName) - strlen(".history"),
|
|
".history") == 0)
|
|
{
|
|
nextWALFileType = XLOG_HISTORY;
|
|
if (RestoreWALFileForRecovery())
|
|
exit(0);
|
|
else
|
|
{
|
|
if (debug)
|
|
{
|
|
fprintf(stderr, "history file not found\n");
|
|
fflush(stderr);
|
|
}
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Main wait loop
|
|
*/
|
|
while (!CustomizableNextWALFileReady() && !triggered)
|
|
{
|
|
if (sleeptime <= 60)
|
|
pg_usleep(sleeptime * 1000000L);
|
|
|
|
if (signaled)
|
|
{
|
|
triggered = true;
|
|
if (debug)
|
|
{
|
|
fprintf(stderr, "\nsignaled to exit\n");
|
|
fflush(stderr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
|
|
if (debug)
|
|
{
|
|
fprintf(stderr, "\nWAL file not present yet.");
|
|
if (triggerPath)
|
|
fprintf(stderr, " Checking for trigger file...");
|
|
fflush(stderr);
|
|
}
|
|
|
|
waittime += sleeptime;
|
|
|
|
if (!triggered && (CheckForExternalTrigger() || (waittime >= maxwaittime && maxwaittime > 0)))
|
|
{
|
|
triggered = true;
|
|
if (debug && waittime >= maxwaittime && maxwaittime > 0)
|
|
fprintf(stderr, "\nTimed out after %d seconds\n", waittime);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Action on exit
|
|
*/
|
|
if (triggered)
|
|
exit(1); /* Normal exit, with non-zero */
|
|
|
|
/*
|
|
* Once we have restored this file successfully we can remove some prior
|
|
* WAL files. If this restore fails we musn't remove any file because some
|
|
* of them will be requested again immediately after the failed restore,
|
|
* or when we restart recovery.
|
|
*/
|
|
if (RestoreWALFileForRecovery() && need_cleanup)
|
|
CustomizableCleanupPriorWALFiles();
|
|
|
|
return 0;
|
|
}
|