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Make WAL-related utilities handle .partial WAL files properly.

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Commit de76884 changed an archive recovery so that the last WAL
segment with old timeline was renamed with suffix .partial. It should
have updated WAL-related utilities so that they can handle such
.paritial WAL files, but we forgot that.

This patch changes pg_archivecleanup so that it can clean up even
archived WAL files with .partial suffix. Also it allows us to specify
.partial WAL file name as the command-line argument "oldestkeptwalfile".

This patch also changes pg_resetxlog so that it can remove .partial
WAL files in pg_xlog directory.

pg_xlogdump cannot handle .partial WAL files. Per discussion,
we decided only to document that limitation instead of adding the fix.
Because a user can easily work around the limitation (i.e., just remove
.partial suffix from the file name) and the fix seems complicated for
very narrow use case.

Back-patch to 9.5 where the problem existed.

Review by Michael Paquier.
Discussion: http://www.postgresql.org/message-id/CAHGQGwGxMKnVHGgTfiig2Bt_2djec0in3-DLJmtg7+nEiidFdQ@mail.gmail.com
This commit is contained in:
Fujii Masao 2015-07-03 11:53:58 +09:00
parent 5671aaca87
commit 8650d161ae
4 changed files with 43 additions and 10 deletions
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6
doc/src/sgml/ref/pg_xlogdump.sgml
View File

@ -215,6 +215,12 @@ PostgreSQL documentation
Only the specified timeline is displayed (or the default, if none is
specified). Records in other timelines are ignored.
</para>
<para>
<application>pg_xlogdump</> cannot read WAL files with suffix
<literal>.partial</>. If those files need to be read, <literal>.partial</>
suffix needs to be removed from the filename.
</para>
</refsect1>
<refsect1>

6
doc/src/sgml/ref/pgarchivecleanup.sgml
View File

@ -60,8 +60,10 @@ archive_cleanup_command = 'pg_archivecleanup <replaceable>archivelocation</> %r'
<para>
When used as a standalone program all WAL files logically preceding the
<replaceable>oldestkeptwalfile</> will be removed from <replaceable>archivelocation</>.
In this mode, if you specify a <filename>.backup</> file name, then only the file prefix
will be used as the <replaceable>oldestkeptwalfile</>. This allows you to remove
In this mode, if you specify a <filename>.partial</> or <filename>.backup</>
file name, then only the file prefix will be used as the
<replaceable>oldestkeptwalfile</>. This treatment of <filename>.backup</>
file name allows you to remove
all WAL files archived prior to a specific base backup without error.
For example, the following example will remove all files older than
WAL file name <filename>000000010000003700000010</>:

31
src/bin/pg_archivecleanup/pg_archivecleanup.c
View File

@ -125,7 +125,7 @@ CleanupPriorWALFiles(void)
* file. Note that this means files are not removed in the order
* they were originally written, in case this worries you.
*/
if (IsXLogFileName(walfile) &&
if ((IsXLogFileName(walfile) || IsPartialXLogFileName(walfile)) &&
strcmp(walfile + 8, exclusiveCleanupFileName + 8) < 0)
{
/*
@ -181,7 +181,7 @@ CleanupPriorWALFiles(void)
* SetWALFileNameForCleanup()
*
* Set the earliest WAL filename that we want to keep on the archive
* and decide whether we need_cleanup
* and decide whether we need cleanup
*/
static void
SetWALFileNameForCleanup(void)
@ -192,9 +192,10 @@ SetWALFileNameForCleanup(void)
/*
* 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
* restartWALFileName is a .partial or .backup filename, make sure we use
* the prefix of the filename, otherwise we will remove wrong files since
* 000000010000000000000010.partial and
* 000000010000000000000010.00000020.backup are after
* 000000010000000000000010.
*/
if (IsXLogFileName(restartWALFileName))
@ -202,6 +203,26 @@ SetWALFileNameForCleanup(void)
strcpy(exclusiveCleanupFileName, restartWALFileName);
fnameOK = true;
}
else if (IsPartialXLogFileName(restartWALFileName))
{
int args;
uint32 tli = 1,
log = 0,
seg = 0;
args = sscanf(restartWALFileName, "%08X%08X%08X.partial",
&tli, &log, &seg);
if (args == 3)
{
fnameOK = true;
/*
* Use just the prefix of the filename, ignore everything after
* first period
*/
XLogFileNameById(exclusiveCleanupFileName, tli, log, seg);
}
}
else if (IsBackupHistoryFileName(restartWALFileName))
{
int args;

10
src/bin/pg_resetxlog/pg_resetxlog.c
View File

@ -906,7 +906,8 @@ FindEndOfXLOG(void)
while (errno = 0, (xlde = readdir(xldir)) != NULL)
{
if (IsXLogFileName(xlde->d_name))
if (IsXLogFileName(xlde->d_name) ||
IsPartialXLogFileName(xlde->d_name))
{
unsigned int tli,
log,
@ -976,7 +977,8 @@ KillExistingXLOG(void)
while (errno = 0, (xlde = readdir(xldir)) != NULL)
{
if (IsXLogFileName(xlde->d_name))
if (IsXLogFileName(xlde->d_name) ||
IsPartialXLogFileName(xlde->d_name))
{
snprintf(path, MAXPGPATH, "%s/%s", XLOGDIR, xlde->d_name);
if (unlink(path) < 0)
@ -1028,7 +1030,9 @@ KillExistingArchiveStatus(void)
{
if (strspn(xlde->d_name, "0123456789ABCDEF") == XLOG_FNAME_LEN &&
(strcmp(xlde->d_name + XLOG_FNAME_LEN, ".ready") == 0 ||
strcmp(xlde->d_name + XLOG_FNAME_LEN, ".done") == 0))
strcmp(xlde->d_name + XLOG_FNAME_LEN, ".done") == 0 ||
strcmp(xlde->d_name + XLOG_FNAME_LEN, ".partial.ready") == 0 ||
strcmp(xlde->d_name + XLOG_FNAME_LEN, ".partial.done") == 0))
{
snprintf(path, MAXPGPATH, "%s/%s", ARCHSTATDIR, xlde->d_name);
if (unlink(path) < 0)