Esempio n. 1
0
/*
 * SetWALFileNameForCleanup()
 *
 *	  Set the earliest WAL filename that we want to keep on the archive
 *	  and decide whether we need_cleanup
 */
static void
SetWALFileNameForCleanup(void)
{
	bool		fnameOK = false;

	TrimExtension(restartWALFileName, additional_ext);

	/*
	 * If restartWALFileName is a WAL file name then just use it directly. If
	 * restartWALFileName is a .backup filename, make sure we use the prefix
	 * of the filename, otherwise we will remove wrong files since
	 * 000000010000000000000010.00000020.backup is after
	 * 000000010000000000000010.
	 */
	if (IsXLogFileName(restartWALFileName))
	{
		strcpy(exclusiveCleanupFileName, restartWALFileName);
		fnameOK = true;
	}
	else if (IsBackupHistoryFileName(restartWALFileName))
	{
		int			args;
		uint32		tli = 1,
					log = 0,
					seg = 0,
					offset = 0;

		args = sscanf(restartWALFileName, "%08X%08X%08X.%08X.backup", &tli, &log, &seg, &offset);
		if (args == 4)
		{
			fnameOK = true;

			/*
			 * Use just the prefix of the filename, ignore everything after
			 * first period
			 */
			XLogFileNameById(exclusiveCleanupFileName, tli, log, seg);
		}
	}

	if (!fnameOK)
	{
		fprintf(stderr, "%s: invalid filename input\n", progname);
		fprintf(stderr, "Try \"%s --help\" for more information.\n", progname);
		exit(2);
	}
}
Esempio n. 2
0
/*
 * CustomizableNextWALFileReady()
 *
 *	  Is the requested file ready yet?
 */
static bool
CustomizableNextWALFileReady(void)
{
	if (stat(WALFilePath, &stat_buf) == 0)
	{
		/*
		 * If we've not seen any WAL segments, we don't know the WAL segment
		 * size, which we need. If it looks like a WAL segment, determine size
		 * of segments for the cluster.
		 */
		if (WalSegSz == -1 && IsXLogFileName(nextWALFileName))
		{
			if (SetWALSegSize())
			{
				/*
				 * Successfully determined WAL segment size. Can compute
				 * cleanup cutoff now.
				 */
				need_cleanup = SetWALFileNameForCleanup();
				if (debug)
				{
					fprintf(stderr,
							_("WAL segment size:     %d \n"), WalSegSz);
					fprintf(stderr, "Keep archive history: ");

					if (need_cleanup)
						fprintf(stderr, "%s and later\n",
								exclusiveCleanupFileName);
					else
						fprintf(stderr, "no cleanup required\n");
				}
			}
		}

		/*
		 * If it's a backup file, return immediately. If it's a regular file
		 * return only if it's the right size already.
		 */
		if (IsBackupHistoryFileName(nextWALFileName))
		{
			nextWALFileType = XLOG_BACKUP_LABEL;
			return true;
		}
		else if (WalSegSz > 0 && stat_buf.st_size == WalSegSz)
		{
#ifdef WIN32

			/*
			 * Windows 'cp' sets the final file size before the copy is
			 * complete, and not yet ready to be opened by pg_standby. So we
			 * wait for sleeptime secs before attempting to restore. If that
			 * is not enough, we will rely on the retry/holdoff mechanism.
			 * GNUWin32's cp does not have this problem.
			 */
			pg_usleep(sleeptime * 1000000L);
#endif
			nextWALFileType = XLOG_DATA;
			return true;
		}

		/*
		 * If still too small, wait until it is the correct size
		 */
		if (WalSegSz > 0 && stat_buf.st_size > WalSegSz)
		{
			if (debug)
			{
				fprintf(stderr, "file size greater than expected\n");
				fflush(stderr);
			}
			exit(3);
		}
	}

	return false;
}