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Map basebackup tablespaces using a tablespace_map file
Windows can't reliably restore symbolic links from a tar format, so instead during backup start we create a tablespace_map file, which is used by the restoring postgres to create the correct links in pg_tblspc. The backup protocol also now has an option to request this file to be included in the backup stream, and this is used by pg_basebackup when operating in tar mode. This is done on all platforms, not just Windows. This means that pg_basebackup will not not work in tar mode against 9.4 and older servers, as this protocol option isn't implemented there. Amit Kapila, reviewed by Dilip Kumar, with a little editing from me.
This commit is contained in:
Andrew Dunstan
parent
d02f16470f
commit
72d422a522
@ -836,8 +836,11 @@ SELECT pg_start_backup('label');
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<function>pg_start_backup</> creates a <firstterm>backup label</> file,
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called <filename>backup_label</>, in the cluster directory with
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information about your backup, including the start time and label
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string. The file is critical to the integrity of the backup, should
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you need to restore from it.
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string. The function also creates a <firstterm>tablespace map</> file,
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called <filename>tablespace_map</>, in the cluster directory with
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information about tablespace symbolic links in <filename>pg_tblspc/</>
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if one or more such link is present. Both files are critical to the
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integrity of the backup, should you need to restore from it.
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</para>
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<para>
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@ -965,17 +968,20 @@ SELECT pg_stop_backup();
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<para>
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It's also worth noting that the <function>pg_start_backup</> function
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makes a file named <filename>backup_label</> in the database cluster
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directory, which is removed by <function>pg_stop_backup</>.
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This file will of course be archived as a part of your backup dump file.
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The backup label file includes the label string you gave to
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<function>pg_start_backup</>, as well as the time at which
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<function>pg_start_backup</> was run, and the name of the starting WAL
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file. In case of confusion it is therefore possible to look inside a
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backup dump file and determine exactly which backup session the dump file
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came from. However, this file is not merely for your information; its
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presence and contents are critical to the proper operation of the system's
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recovery process.
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makes files named <filename>backup_label</> and
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<filename>tablesapce_map</> in the database cluster directory,
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which are removed by <function>pg_stop_backup</>. These files will of
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course be archived as a part of your backup dump file. The backup label
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file includes the label string you gave to <function>pg_start_backup</>,
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as well as the time at which <function>pg_start_backup</> was run, and
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the name of the starting WAL file. In case of confusion it is therefore
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possible to look inside a backup dump file and determine exactly which
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backup session the dump file came from. The tablespace map file includes
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the symbolic link names as they exist in the directory
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<filename>pg_tblspc/</> and the full path of each symbolic link.
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These files are not merely for your information; their presence and
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contents are critical to the proper operation of the system's recovery
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process.
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</para>
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<para>
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@ -16591,11 +16591,12 @@ SELECT set_config('log_statement_stats', 'off', false);
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<function>pg_start_backup</> accepts an
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arbitrary user-defined label for the backup. (Typically this would be
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the name under which the backup dump file will be stored.) The function
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writes a backup label file (<filename>backup_label</>) into the
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database cluster's data directory, performs a checkpoint,
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and then returns the backup's starting transaction log location as text.
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The user can ignore this result value, but it is
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provided in case it is useful.
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writes a backup label file (<filename>backup_label</>) and, if there
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are any links in the <filename>pg_tblspc/</> directory, a tablespace map
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file (<filename>tablespace_map</>) into the database cluster's data
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directory, performs a checkpoint, and then returns the backup's starting
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transaction log location as text. The user can ignore this result value,
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but it is provided in case it is useful.
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<programlisting>
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postgres=# select pg_start_backup('label_goes_here');
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pg_start_backup
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@ -16610,7 +16611,8 @@ postgres=# select pg_start_backup('label_goes_here');
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</para>
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<para>
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<function>pg_stop_backup</> removes the label file created by
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<function>pg_stop_backup</> removes the label file and, if it exists,
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the <filename>tablespace_map</> file created by
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<function>pg_start_backup</>, and creates a backup history file in
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the transaction log archive area. The history file includes the label given to
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<function>pg_start_backup</>, the starting and ending transaction log locations for
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@ -1882,7 +1882,7 @@ The commands accepted in walsender mode are:
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</varlistentry>
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<varlistentry>
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<term>BASE_BACKUP [<literal>LABEL</literal> <replaceable>'label'</replaceable>] [<literal>PROGRESS</literal>] [<literal>FAST</literal>] [<literal>WAL</literal>] [<literal>NOWAIT</literal>] [<literal>MAX_RATE</literal> <replaceable>rate</replaceable>]
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<term>BASE_BACKUP [<literal>LABEL</literal> <replaceable>'label'</replaceable>] [<literal>PROGRESS</literal>] [<literal>FAST</literal>] [<literal>WAL</literal>] [<literal>NOWAIT</literal>] [<literal>MAX_RATE</literal> <replaceable>rate</replaceable>] [<literal>TABLESPACE_MAP</literal>]
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<indexterm><primary>BASE_BACKUP</primary></indexterm>
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</term>
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<listitem>
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@ -1968,6 +1968,19 @@ The commands accepted in walsender mode are:
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>TABLESPACE_MAP</literal></term>
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<listitem>
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<para>
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Include information about symbolic links present in the directory
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<filename>pg_tblspc</filename> in a file named
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<filename>tablespace_map</filename>. The tablespace map file includes
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each symbolic link name as it exists in the directory
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<filename>pg_tblspc/</> and the full path of that symbolic link.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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@ -587,11 +587,23 @@ PostgreSQL documentation
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tablespaces.
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</para>
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<para>
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When tar format mode is used, it is the user's responsibility to unpack each
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tar file before starting postgres. If there are additional tablespaces, the
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tar files for them need to be unpacked in the correct locations. In this
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case the symbolic links for those tablespaces will be created by Postgres
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according to the contents of the <filename>tablespace_map</> file that is
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included in the <filename>base.tar</> file.
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</para>
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<para>
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<application>pg_basebackup</application> works with servers of the same
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or an older major version, down to 9.1. However, WAL streaming mode (-X
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stream) only works with server version 9.3 and later.
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stream) only works with server version 9.3 and later, and tar format mode
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(--format=tar) of the current version only works with server version 9.5
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or later.
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</para>
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</refsect1>
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<refsect1>
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@ -42,6 +42,7 @@
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#include "pgstat.h"
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#include "postmaster/bgwriter.h"
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#include "postmaster/startup.h"
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#include "replication/basebackup.h"
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#include "replication/logical.h"
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#include "replication/slot.h"
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#include "replication/origin.h"
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@ -824,6 +825,8 @@ static void xlog_outdesc(StringInfo buf, XLogReaderState *record);
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static void pg_start_backup_callback(int code, Datum arg);
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static bool read_backup_label(XLogRecPtr *checkPointLoc,
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bool *backupEndRequired, bool *backupFromStandby);
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static bool read_tablespace_map(List **tablespaces);
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static void rm_redo_error_callback(void *arg);
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static int get_sync_bit(int method);
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@ -5917,6 +5920,7 @@ StartupXLOG(void)
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bool wasShutdown;
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bool reachedStopPoint = false;
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bool haveBackupLabel = false;
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bool haveTblspcMap = false;
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XLogRecPtr RecPtr,
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checkPointLoc,
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EndOfLog;
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@ -6001,16 +6005,6 @@ StartupXLOG(void)
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*/
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ValidateXLOGDirectoryStructure();
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/*
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* Clear out any old relcache cache files. This is *necessary* if we do
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* any WAL replay, since that would probably result in the cache files
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* being out of sync with database reality. In theory we could leave them
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* in place if the database had been cleanly shut down, but it seems
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* safest to just remove them always and let them be rebuilt during the
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* first backend startup.
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*/
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RelationCacheInitFileRemove();
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/*
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* Initialize on the assumption we want to recover to the latest timeline
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* that's active according to pg_control.
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@ -6080,6 +6074,8 @@ StartupXLOG(void)
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if (read_backup_label(&checkPointLoc, &backupEndRequired,
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&backupFromStandby))
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{
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List *tablespaces = NIL;
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/*
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* Archive recovery was requested, and thanks to the backup label
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* file, we know how far we need to replay to reach consistency. Enter
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@ -6124,6 +6120,59 @@ StartupXLOG(void)
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errhint("If you are not restoring from a backup, try removing the file \"%s/backup_label\".", DataDir)));
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wasShutdown = false; /* keep compiler quiet */
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}
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/* read the tablespace_map file if present and create symlinks. */
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if (read_tablespace_map(&tablespaces))
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{
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ListCell *lc;
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struct stat st;
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foreach(lc, tablespaces)
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{
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tablespaceinfo *ti = lfirst(lc);
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char *linkloc;
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linkloc = psprintf("pg_tblspc/%s", ti->oid);
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/*
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* Remove the existing symlink if any and Create the symlink
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* under PGDATA. We need to use rmtree instead of rmdir as
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* the link location might contain directories or files
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* corresponding to the actual path. Some tar utilities do
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* things that way while extracting symlinks.
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*/
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if (lstat(linkloc, &st) == 0 && S_ISDIR(st.st_mode))
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{
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if (!rmtree(linkloc,true))
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not remove directory \"%s\": %m",
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linkloc)));
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}
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else
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{
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if (unlink(linkloc) < 0 && errno != ENOENT)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not remove symbolic link \"%s\": %m",
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linkloc)));
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}
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if (symlink(ti->path, linkloc) < 0)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not create symbolic link \"%s\": %m",
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linkloc)));
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pfree(ti->oid);
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pfree(ti->path);
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pfree(ti);
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}
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/* set flag to delete it later */
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haveTblspcMap = true;
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}
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/* set flag to delete it later */
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haveBackupLabel = true;
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}
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@ -6197,6 +6246,20 @@ StartupXLOG(void)
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wasShutdown = (record->xl_info == XLOG_CHECKPOINT_SHUTDOWN);
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}
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/*
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* Clear out any old relcache cache files. This is *necessary* if we do
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* any WAL replay, since that would probably result in the cache files
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* being out of sync with database reality. In theory we could leave them
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* in place if the database had been cleanly shut down, but it seems
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* safest to just remove them always and let them be rebuilt during the
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* first backend startup. These files needs to be removed from all
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* directories including pg_tblspc, however the symlinks are created
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* only after reading tablesapce_map file in case of archive recovery
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* from backup, so needs to clear old relcache files here after creating
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* symlinks.
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*/
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RelationCacheInitFileRemove();
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/*
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* If the location of the checkpoint record is not on the expected
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* timeline in the history of the requested timeline, we cannot proceed:
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@ -6466,6 +6529,23 @@ StartupXLOG(void)
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BACKUP_LABEL_FILE, BACKUP_LABEL_OLD)));
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}
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/*
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* If there was a tablespace_map file, it's done its job and the
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* symlinks have been created. We must get rid of the map file
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* so that if we crash during recovery, we don't create symlinks
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* again. It seems prudent though to just rename the file out of
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* the way rather than delete it completely.
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*/
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if (haveTblspcMap)
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{
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unlink(TABLESPACE_MAP_OLD);
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if (rename(TABLESPACE_MAP, TABLESPACE_MAP_OLD) != 0)
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ereport(FATAL,
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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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TABLESPACE_MAP, TABLESPACE_MAP_OLD)));
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}
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/* Check that the GUCs used to generate the WAL allow recovery */
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CheckRequiredParameterValues();
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@ -9610,16 +9690,27 @@ XLogFileNameP(TimeLineID tli, XLogSegNo segno)
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*
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* There are two kind of backups: exclusive and non-exclusive. An exclusive
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* backup is started with pg_start_backup(), and there can be only one active
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* at a time. The backup label file of an exclusive backup is written to
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* $PGDATA/backup_label, and it is removed by pg_stop_backup().
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* at a time. The backup and tablespace map files of an exclusive backup are
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* written to $PGDATA/backup_label and $PGDATA/tablespace_map, and they are
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* removed by pg_stop_backup().
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*
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* A non-exclusive backup is used for the streaming base backups (see
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* src/backend/replication/basebackup.c). The difference to exclusive backups
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* is that the backup label file is not written to disk. Instead, its would-be
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* contents are returned in *labelfile, and the caller is responsible for
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* including it in the backup archive as 'backup_label'. There can be many
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* non-exclusive backups active at the same time, and they don't conflict
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* with an exclusive backup either.
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* is that the backup label and tablespace map files are not written to disk.
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* Instead, there would-be contents are returned in *labelfile and *tblspcmapfile,
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* and the caller is responsible for including them in the backup archive as
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* 'backup_label' and 'tablespace_map'. There can be many non-exclusive backups
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* active at the same time, and they don't conflict with an exclusive backup
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* either.
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*
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* tblspcmapfile is required mainly for tar format in windows as native windows
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* utilities are not able to create symlinks while extracting files from tar.
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* However for consistency, the same is used for all platforms.
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*
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* needtblspcmapfile is true for the cases (exclusive backup and for
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* non-exclusive backup only when tar format is used for taking backup)
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* when backup needs to generate tablespace_map file, it is used to
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* embed escape character before newline character in tablespace path.
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*
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* Returns the minimum WAL position that must be present to restore from this
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* backup, and the corresponding timeline ID in *starttli_p.
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@ -9632,7 +9723,9 @@ XLogFileNameP(TimeLineID tli, XLogSegNo segno)
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*/
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XLogRecPtr
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do_pg_start_backup(const char *backupidstr, bool fast, TimeLineID *starttli_p,
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char **labelfile)
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char **labelfile, DIR *tblspcdir, List **tablespaces,
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char **tblspcmapfile, bool infotbssize,
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bool needtblspcmapfile)
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{
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bool exclusive = (labelfile == NULL);
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bool backup_started_in_recovery = false;
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@ -9646,6 +9739,7 @@ do_pg_start_backup(const char *backupidstr, bool fast, TimeLineID *starttli_p,
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struct stat stat_buf;
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FILE *fp;
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StringInfoData labelfbuf;
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StringInfoData tblspc_mapfbuf;
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backup_started_in_recovery = RecoveryInProgress();
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@ -9717,6 +9811,9 @@ do_pg_start_backup(const char *backupidstr, bool fast, TimeLineID *starttli_p,
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PG_ENSURE_ERROR_CLEANUP(pg_start_backup_callback, (Datum) BoolGetDatum(exclusive));
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{
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bool gotUniqueStartpoint = false;
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struct dirent *de;
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tablespaceinfo *ti;
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int datadirpathlen;
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/*
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* Force an XLOG file switch before the checkpoint, to ensure that the
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@ -9836,6 +9933,98 @@ do_pg_start_backup(const char *backupidstr, bool fast, TimeLineID *starttli_p,
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XLByteToSeg(startpoint, _logSegNo);
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XLogFileName(xlogfilename, ThisTimeLineID, _logSegNo);
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/*
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* Construct tablespace_map file
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*/
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initStringInfo(&tblspc_mapfbuf);
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datadirpathlen = strlen(DataDir);
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/* Collect information about all tablespaces */
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while ((de = ReadDir(tblspcdir, "pg_tblspc")) != NULL)
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{
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char fullpath[MAXPGPATH];
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char linkpath[MAXPGPATH];
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char *relpath = NULL;
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int rllen;
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StringInfoData buflinkpath;
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char *s = linkpath;
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/* Skip special stuff */
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if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0)
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continue;
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snprintf(fullpath, sizeof(fullpath), "pg_tblspc/%s", de->d_name);
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#if defined(HAVE_READLINK) || defined(WIN32)
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rllen = readlink(fullpath, linkpath, sizeof(linkpath));
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if (rllen < 0)
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{
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ereport(WARNING,
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(errmsg("could not read symbolic link \"%s\": %m",
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fullpath)));
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continue;
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}
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else if (rllen >= sizeof(linkpath))
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{
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ereport(WARNING,
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(errmsg("symbolic link \"%s\" target is too long",
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fullpath)));
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continue;
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}
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linkpath[rllen] = '\0';
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/*
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* Add the escape character '\\' before newline in a string
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* to ensure that we can distinguish between the newline in
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* the tablespace path and end of line while reading
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* tablespace_map file during archive recovery.
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*/
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initStringInfo(&buflinkpath);
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while (*s)
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{
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if ((*s == '\n' || *s == '\r') && needtblspcmapfile)
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appendStringInfoChar(&buflinkpath, '\\');
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appendStringInfoChar(&buflinkpath, *s++);
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}
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/*
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* Relpath holds the relative path of the tablespace directory
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* when it's located within PGDATA, or NULL if it's located
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* elsewhere.
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*/
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if (rllen > datadirpathlen &&
|
||||
strncmp(linkpath, DataDir, datadirpathlen) == 0 &&
|
||||
IS_DIR_SEP(linkpath[datadirpathlen]))
|
||||
relpath = linkpath + datadirpathlen + 1;
|
||||
|
||||
ti = palloc(sizeof(tablespaceinfo));
|
||||
ti->oid = pstrdup(de->d_name);
|
||||
ti->path = pstrdup(buflinkpath.data);
|
||||
ti->rpath = relpath ? pstrdup(relpath) : NULL;
|
||||
ti->size = infotbssize ? sendTablespace(fullpath, true) : -1;
|
||||
|
||||
if(tablespaces)
|
||||
*tablespaces = lappend(*tablespaces, ti);
|
||||
|
||||
appendStringInfo(&tblspc_mapfbuf, "%s %s\n", ti->oid, ti->path);
|
||||
|
||||
pfree(buflinkpath.data);
|
||||
#else
|
||||
|
||||
/*
|
||||
* If the platform does not have symbolic links, it should not be
|
||||
* possible to have tablespaces - clearly somebody else created
|
||||
* them. Warn about it and ignore.
|
||||
*/
|
||||
ereport(WARNING,
|
||||
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
||||
errmsg("tablespaces are not supported on this platform")));
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* Construct backup label file
|
||||
*/
|
||||
@ -9899,9 +10088,51 @@ do_pg_start_backup(const char *backupidstr, bool fast, TimeLineID *starttli_p,
|
||||
errmsg("could not write file \"%s\": %m",
|
||||
BACKUP_LABEL_FILE)));
|
||||
pfree(labelfbuf.data);
|
||||
|
||||
/* Write backup tablespace_map file. */
|
||||
if (tblspc_mapfbuf.len > 0)
|
||||
{
|
||||
if (stat(TABLESPACE_MAP, &stat_buf) != 0)
|
||||
{
|
||||
if (errno != ENOENT)
|
||||
ereport(ERROR,
|
||||
(errcode_for_file_access(),
|
||||
errmsg("could not stat file \"%s\": %m",
|
||||
TABLESPACE_MAP)));
|
||||
}
|
||||
else
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
||||
errmsg("a backup is already in progress"),
|
||||
errhint("If you're sure there is no backup in progress, remove file \"%s\" and try again.",
|
||||
TABLESPACE_MAP)));
|
||||
|
||||
fp = AllocateFile(TABLESPACE_MAP, "w");
|
||||
|
||||
if (!fp)
|
||||
ereport(ERROR,
|
||||
(errcode_for_file_access(),
|
||||
errmsg("could not create file \"%s\": %m",
|
||||
TABLESPACE_MAP)));
|
||||
if (fwrite(tblspc_mapfbuf.data, tblspc_mapfbuf.len, 1, fp) != 1 ||
|
||||
fflush(fp) != 0 ||
|
||||
pg_fsync(fileno(fp)) != 0 ||
|
||||
ferror(fp) ||
|
||||
FreeFile(fp))
|
||||
ereport(ERROR,
|
||||
(errcode_for_file_access(),
|
||||
errmsg("could not write file \"%s\": %m",
|
||||
TABLESPACE_MAP)));
|
||||
}
|
||||
|
||||
pfree(tblspc_mapfbuf.data);
|
||||
}
|
||||
else
|
||||
{
|
||||
*labelfile = labelfbuf.data;
|
||||
if (tblspc_mapfbuf.len > 0)
|
||||
*tblspcmapfile = tblspc_mapfbuf.data;
|
||||
}
|
||||
}
|
||||
PG_END_ENSURE_ERROR_CLEANUP(pg_start_backup_callback, (Datum) BoolGetDatum(exclusive));
|
||||
|
||||
@ -10072,6 +10303,12 @@ do_pg_stop_backup(char *labelfile, bool waitforarchive, TimeLineID *stoptli_p)
|
||||
(errcode_for_file_access(),
|
||||
errmsg("could not remove file \"%s\": %m",
|
||||
BACKUP_LABEL_FILE)));
|
||||
|
||||
/*
|
||||
* Remove tablespace_map file if present, it is created
|
||||
* only if there are tablespaces.
|
||||
*/
|
||||
unlink(TABLESPACE_MAP);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -10471,6 +10708,86 @@ read_backup_label(XLogRecPtr *checkPointLoc, bool *backupEndRequired,
|
||||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* read_tablespace_map: check to see if a tablespace_map file is present
|
||||
*
|
||||
* If we see a tablespace_map file during recovery, we assume that we are
|
||||
* recovering from a backup dump file, and we therefore need to create symlinks
|
||||
* as per the information present in tablespace_map file.
|
||||
*
|
||||
* Returns TRUE if a tablespace_map file was found (and fills the link
|
||||
* information for all the tablespace links present in file); returns FALSE
|
||||
* if not.
|
||||
*/
|
||||
static bool
|
||||
read_tablespace_map(List **tablespaces)
|
||||
{
|
||||
tablespaceinfo *ti;
|
||||
FILE *lfp;
|
||||
char tbsoid[MAXPGPATH];
|
||||
char *tbslinkpath;
|
||||
char str[MAXPGPATH];
|
||||
int ch, prev_ch = -1,
|
||||
i = 0, n;
|
||||
|
||||
/*
|
||||
* See if tablespace_map file is present
|
||||
*/
|
||||
lfp = AllocateFile(TABLESPACE_MAP, "r");
|
||||
if (!lfp)
|
||||
{
|
||||
if (errno != ENOENT)
|
||||
ereport(FATAL,
|
||||
(errcode_for_file_access(),
|
||||
errmsg("could not read file \"%s\": %m",
|
||||
TABLESPACE_MAP)));
|
||||
return false; /* it's not there, all is fine */
|
||||
}
|
||||
|
||||
/*
|
||||
* Read and parse the link name and path lines from tablespace_map file
|
||||
* (this code is pretty crude, but we are not expecting any variability
|
||||
* in the file format). While taking backup we embed escape character
|
||||
* '\\' before newline in tablespace path, so that during reading of
|
||||
* tablespace_map file, we could distinguish newline in tablespace path
|
||||
* and end of line. Now while reading tablespace_map file, remove the
|
||||
* escape character that has been added in tablespace path during backup.
|
||||
*/
|
||||
while ((ch = fgetc(lfp)) != EOF)
|
||||
{
|
||||
if ((ch == '\n' || ch == '\r') && prev_ch != '\\')
|
||||
{
|
||||
str[i] = '\0';
|
||||
if (sscanf(str, "%s %n", tbsoid, &n) != 1)
|
||||
ereport(FATAL,
|
||||
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
||||
errmsg("invalid data in file \"%s\"", TABLESPACE_MAP)));
|
||||
tbslinkpath = str + n;
|
||||
i = 0;
|
||||
|
||||
ti = palloc(sizeof(tablespaceinfo));
|
||||
ti->oid = pstrdup(tbsoid);
|
||||
ti->path = pstrdup(tbslinkpath);
|
||||
|
||||
*tablespaces = lappend(*tablespaces, ti);
|
||||
continue;
|
||||
}
|
||||
else if ((ch == '\n' || ch == '\r') && prev_ch == '\\')
|
||||
str[i-1] = ch;
|
||||
else
|
||||
str[i++] = ch;
|
||||
prev_ch = ch;
|
||||
}
|
||||
|
||||
if (ferror(lfp) || FreeFile(lfp))
|
||||
ereport(FATAL,
|
||||
(errcode_for_file_access(),
|
||||
errmsg("could not read file \"%s\": %m",
|
||||
TABLESPACE_MAP)));
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* Error context callback for errors occurring during rm_redo().
|
||||
*/
|
||||
@ -10502,11 +10819,16 @@ BackupInProgress(void)
|
||||
}
|
||||
|
||||
/*
|
||||
* CancelBackup: rename the "backup_label" file to cancel backup mode
|
||||
* CancelBackup: rename the "backup_label" and "tablespace_map"
|
||||
* files to cancel backup mode
|
||||
*
|
||||
* If the "backup_label" file exists, it will be renamed to "backup_label.old".
|
||||
* Note that this will render an online backup in progress useless.
|
||||
* To correctly finish an online backup, pg_stop_backup must be called.
|
||||
* Similarly, if the "tablespace_map" file exists, it will be renamed to
|
||||
* "tablespace_map.old".
|
||||
*
|
||||
* Note that this will render an online backup in progress
|
||||
* useless. To correctly finish an online backup, pg_stop_backup must be
|
||||
* called.
|
||||
*/
|
||||
void
|
||||
CancelBackup(void)
|
||||
@ -10535,6 +10857,29 @@ CancelBackup(void)
|
||||
errdetail("Could not rename \"%s\" to \"%s\": %m.",
|
||||
BACKUP_LABEL_FILE, BACKUP_LABEL_OLD)));
|
||||
}
|
||||
|
||||
/* if the tablespace_map file is not there, return */
|
||||
if (stat(TABLESPACE_MAP, &stat_buf) < 0)
|
||||
return;
|
||||
|
||||
/* remove leftover file from previously canceled backup if it exists */
|
||||
unlink(TABLESPACE_MAP_OLD);
|
||||
|
||||
if (rename(TABLESPACE_MAP, TABLESPACE_MAP_OLD) == 0)
|
||||
{
|
||||
ereport(LOG,
|
||||
(errmsg("online backup mode canceled"),
|
||||
errdetail("\"%s\" was renamed to \"%s\".",
|
||||
TABLESPACE_MAP, TABLESPACE_MAP_OLD)));
|
||||
}
|
||||
else
|
||||
{
|
||||
ereport(WARNING,
|
||||
(errcode_for_file_access(),
|
||||
errmsg("online backup mode was not canceled"),
|
||||
errdetail("Could not rename \"%s\" to \"%s\": %m.",
|
||||
TABLESPACE_MAP, TABLESPACE_MAP_OLD)));
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
|
||||
@ -51,6 +51,7 @@ pg_start_backup(PG_FUNCTION_ARGS)
|
||||
bool fast = PG_GETARG_BOOL(1);
|
||||
char *backupidstr;
|
||||
XLogRecPtr startpoint;
|
||||
DIR *dir;
|
||||
|
||||
backupidstr = text_to_cstring(backupid);
|
||||
|
||||
@ -59,7 +60,16 @@ pg_start_backup(PG_FUNCTION_ARGS)
|
||||
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
||||
errmsg("must be superuser or replication role to run a backup")));
|
||||
|
||||
startpoint = do_pg_start_backup(backupidstr, fast, NULL, NULL);
|
||||
/* Make sure we can open the directory with tablespaces in it */
|
||||
dir = AllocateDir("pg_tblspc");
|
||||
if (!dir)
|
||||
ereport(ERROR,
|
||||
(errmsg("could not open directory \"%s\": %m", "pg_tblspc")));
|
||||
|
||||
startpoint = do_pg_start_backup(backupidstr, fast, NULL, NULL,
|
||||
dir, NULL, NULL, false, true);
|
||||
|
||||
FreeDir(dir);
|
||||
|
||||
PG_RETURN_LSN(startpoint);
|
||||
}
|
||||
|
||||
@ -46,11 +46,12 @@ typedef struct
|
||||
bool nowait;
|
||||
bool includewal;
|
||||
uint32 maxrate;
|
||||
bool sendtblspcmapfile;
|
||||
} basebackup_options;
|
||||
|
||||
|
||||
static int64 sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces);
|
||||
static int64 sendTablespace(char *path, bool sizeonly);
|
||||
static int64 sendDir(char *path, int basepathlen, bool sizeonly,
|
||||
List *tablespaces, bool sendtblspclinks);
|
||||
static bool sendFile(char *readfilename, char *tarfilename,
|
||||
struct stat * statbuf, bool missing_ok);
|
||||
static void sendFileWithContent(const char *filename, const char *content);
|
||||
@ -93,15 +94,6 @@ static int64 elapsed_min_unit;
|
||||
/* The last check of the transfer rate. */
|
||||
static int64 throttled_last;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
char *oid;
|
||||
char *path;
|
||||
char *rpath; /* relative path within PGDATA, or NULL */
|
||||
int64 size;
|
||||
} tablespaceinfo;
|
||||
|
||||
|
||||
/*
|
||||
* Called when ERROR or FATAL happens in perform_base_backup() after
|
||||
* we have started the backup - make sure we end it!
|
||||
@ -126,14 +118,18 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
|
||||
XLogRecPtr endptr;
|
||||
TimeLineID endtli;
|
||||
char *labelfile;
|
||||
char *tblspc_map_file = NULL;
|
||||
int datadirpathlen;
|
||||
List *tablespaces = NIL;
|
||||
|
||||
datadirpathlen = strlen(DataDir);
|
||||
|
||||
backup_started_in_recovery = RecoveryInProgress();
|
||||
|
||||
startptr = do_pg_start_backup(opt->label, opt->fastcheckpoint, &starttli,
|
||||
&labelfile);
|
||||
&labelfile, tblspcdir, &tablespaces,
|
||||
&tblspc_map_file,
|
||||
opt->progress, opt->sendtblspcmapfile);
|
||||
/*
|
||||
* Once do_pg_start_backup has been called, ensure that any failure causes
|
||||
* us to abort the backup so we don't "leak" a backup counter. For this reason,
|
||||
@ -143,9 +139,7 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
|
||||
|
||||
PG_ENSURE_ERROR_CLEANUP(base_backup_cleanup, (Datum) 0);
|
||||
{
|
||||
List *tablespaces = NIL;
|
||||
ListCell *lc;
|
||||
struct dirent *de;
|
||||
tablespaceinfo *ti;
|
||||
|
||||
SendXlogRecPtrResult(startptr, starttli);
|
||||
@ -162,70 +156,9 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
|
||||
else
|
||||
statrelpath = pgstat_stat_directory;
|
||||
|
||||
/* Collect information about all tablespaces */
|
||||
while ((de = ReadDir(tblspcdir, "pg_tblspc")) != NULL)
|
||||
{
|
||||
char fullpath[MAXPGPATH];
|
||||
char linkpath[MAXPGPATH];
|
||||
char *relpath = NULL;
|
||||
int rllen;
|
||||
|
||||
/* Skip special stuff */
|
||||
if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0)
|
||||
continue;
|
||||
|
||||
snprintf(fullpath, sizeof(fullpath), "pg_tblspc/%s", de->d_name);
|
||||
|
||||
#if defined(HAVE_READLINK) || defined(WIN32)
|
||||
rllen = readlink(fullpath, linkpath, sizeof(linkpath));
|
||||
if (rllen < 0)
|
||||
{
|
||||
ereport(WARNING,
|
||||
(errmsg("could not read symbolic link \"%s\": %m",
|
||||
fullpath)));
|
||||
continue;
|
||||
}
|
||||
else if (rllen >= sizeof(linkpath))
|
||||
{
|
||||
ereport(WARNING,
|
||||
(errmsg("symbolic link \"%s\" target is too long",
|
||||
fullpath)));
|
||||
continue;
|
||||
}
|
||||
linkpath[rllen] = '\0';
|
||||
|
||||
/*
|
||||
* Relpath holds the relative path of the tablespace directory
|
||||
* when it's located within PGDATA, or NULL if it's located
|
||||
* elsewhere.
|
||||
*/
|
||||
if (rllen > datadirpathlen &&
|
||||
strncmp(linkpath, DataDir, datadirpathlen) == 0 &&
|
||||
IS_DIR_SEP(linkpath[datadirpathlen]))
|
||||
relpath = linkpath + datadirpathlen + 1;
|
||||
|
||||
ti = palloc(sizeof(tablespaceinfo));
|
||||
ti->oid = pstrdup(de->d_name);
|
||||
ti->path = pstrdup(linkpath);
|
||||
ti->rpath = relpath ? pstrdup(relpath) : NULL;
|
||||
ti->size = opt->progress ? sendTablespace(fullpath, true) : -1;
|
||||
tablespaces = lappend(tablespaces, ti);
|
||||
#else
|
||||
|
||||
/*
|
||||
* If the platform does not have symbolic links, it should not be
|
||||
* possible to have tablespaces - clearly somebody else created
|
||||
* them. Warn about it and ignore.
|
||||
*/
|
||||
ereport(WARNING,
|
||||
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
||||
errmsg("tablespaces are not supported on this platform")));
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Add a node for the base directory at the end */
|
||||
ti = palloc0(sizeof(tablespaceinfo));
|
||||
ti->size = opt->progress ? sendDir(".", 1, true, tablespaces) : -1;
|
||||
ti->size = opt->progress ? sendDir(".", 1, true, tablespaces, true) : -1;
|
||||
tablespaces = lappend(tablespaces, ti);
|
||||
|
||||
/* Send tablespace header */
|
||||
@ -274,8 +207,17 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
|
||||
/* In the main tar, include the backup_label first... */
|
||||
sendFileWithContent(BACKUP_LABEL_FILE, labelfile);
|
||||
|
||||
/* ... then the bulk of the files ... */
|
||||
sendDir(".", 1, false, tablespaces);
|
||||
/*
|
||||
* Send tablespace_map file if required and then the bulk of
|
||||
* the files.
|
||||
*/
|
||||
if (tblspc_map_file && opt->sendtblspcmapfile)
|
||||
{
|
||||
sendFileWithContent(TABLESPACE_MAP, tblspc_map_file);
|
||||
sendDir(".", 1, false, tablespaces, false);
|
||||
}
|
||||
else
|
||||
sendDir(".", 1, false, tablespaces, true);
|
||||
|
||||
/* ... and pg_control after everything else. */
|
||||
if (lstat(XLOG_CONTROL_FILE, &statbuf) != 0)
|
||||
@ -567,6 +509,7 @@ parse_basebackup_options(List *options, basebackup_options *opt)
|
||||
bool o_nowait = false;
|
||||
bool o_wal = false;
|
||||
bool o_maxrate = false;
|
||||
bool o_tablespace_map = false;
|
||||
|
||||
MemSet(opt, 0, sizeof(*opt));
|
||||
foreach(lopt, options)
|
||||
@ -637,6 +580,15 @@ parse_basebackup_options(List *options, basebackup_options *opt)
|
||||
opt->maxrate = (uint32) maxrate;
|
||||
o_maxrate = true;
|
||||
}
|
||||
else if (strcmp(defel->defname, "tablespace_map") == 0)
|
||||
{
|
||||
if (o_tablespace_map)
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_SYNTAX_ERROR),
|
||||
errmsg("duplicate option \"%s\"", defel->defname)));
|
||||
opt->sendtblspcmapfile = true;
|
||||
o_tablespace_map = true;
|
||||
}
|
||||
else
|
||||
elog(ERROR, "option \"%s\" not recognized",
|
||||
defel->defname);
|
||||
@ -865,7 +817,7 @@ sendFileWithContent(const char *filename, const char *content)
|
||||
*
|
||||
* Only used to send auxiliary tablespaces, not PGDATA.
|
||||
*/
|
||||
static int64
|
||||
int64
|
||||
sendTablespace(char *path, bool sizeonly)
|
||||
{
|
||||
int64 size;
|
||||
@ -899,7 +851,7 @@ sendTablespace(char *path, bool sizeonly)
|
||||
size = 512; /* Size of the header just added */
|
||||
|
||||
/* Send all the files in the tablespace version directory */
|
||||
size += sendDir(pathbuf, strlen(path), sizeonly, NIL);
|
||||
size += sendDir(pathbuf, strlen(path), sizeonly, NIL, true);
|
||||
|
||||
return size;
|
||||
}
|
||||
@ -911,9 +863,14 @@ sendTablespace(char *path, bool sizeonly)
|
||||
*
|
||||
* Omit any directory in the tablespaces list, to avoid backing up
|
||||
* tablespaces twice when they were created inside PGDATA.
|
||||
*
|
||||
* If sendtblspclinks is true, we need to include symlink
|
||||
* information in the tar file. If not, we can skip that
|
||||
* as it will be sent separately in the tablespace_map file.
|
||||
*/
|
||||
static int64
|
||||
sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces)
|
||||
sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces,
|
||||
bool sendtblspclinks)
|
||||
{
|
||||
DIR *dir;
|
||||
struct dirent *de;
|
||||
@ -941,13 +898,17 @@ sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* If there's a backup_label file, it belongs to a backup started by
|
||||
* the user with pg_start_backup(). It is *not* correct for this
|
||||
* backup, our backup_label is injected into the tar separately.
|
||||
* If there's a backup_label or tablespace_map file, it belongs to a
|
||||
* backup started by the user with pg_start_backup(). It is *not*
|
||||
* correct for this backup, our backup_label/tablespace_map is injected
|
||||
* into the tar separately.
|
||||
*/
|
||||
if (strcmp(de->d_name, BACKUP_LABEL_FILE) == 0)
|
||||
continue;
|
||||
|
||||
if (strcmp(de->d_name, TABLESPACE_MAP) == 0)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* Check if the postmaster has signaled us to exit, and abort with an
|
||||
* error in that case. The error handler further up will call
|
||||
@ -1120,8 +1081,15 @@ sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* skip sending directories inside pg_tblspc, if not required.
|
||||
*/
|
||||
if (strcmp(pathbuf, "./pg_tblspc") == 0 && !sendtblspclinks)
|
||||
skip_this_dir = true;
|
||||
|
||||
if (!skip_this_dir)
|
||||
size += sendDir(pathbuf, basepathlen, sizeonly, tablespaces);
|
||||
size += sendDir(pathbuf, basepathlen, sizeonly, tablespaces, sendtblspclinks);
|
||||
}
|
||||
else if (S_ISREG(statbuf.st_mode))
|
||||
{
|
||||
|
||||
@ -71,13 +71,16 @@ Node *replication_parse_result;
|
||||
%token K_NOWAIT
|
||||
%token K_MAX_RATE
|
||||
%token K_WAL
|
||||
%token K_TABLESPACE_MAP
|
||||
%token K_TIMELINE
|
||||
%token K_PHYSICAL
|
||||
%token K_LOGICAL
|
||||
%token K_SLOT
|
||||
|
||||
%type <node> command
|
||||
%type <node> base_backup start_replication start_logical_replication create_replication_slot drop_replication_slot identify_system timeline_history
|
||||
%type <node> base_backup start_replication start_logical_replication
|
||||
create_replication_slot drop_replication_slot identify_system
|
||||
timeline_history
|
||||
%type <list> base_backup_opt_list
|
||||
%type <defelt> base_backup_opt
|
||||
%type <uintval> opt_timeline
|
||||
@ -119,12 +122,14 @@ identify_system:
|
||||
;
|
||||
|
||||
/*
|
||||
* BASE_BACKUP [LABEL '<label>'] [PROGRESS] [FAST] [WAL] [NOWAIT] [MAX_RATE %d]
|
||||
* BASE_BACKUP [LABEL '<label>'] [PROGRESS] [FAST] [WAL] [NOWAIT]
|
||||
* [MAX_RATE %d] [TABLESPACE_MAP]
|
||||
*/
|
||||
base_backup:
|
||||
K_BASE_BACKUP base_backup_opt_list
|
||||
{
|
||||
BaseBackupCmd *cmd = (BaseBackupCmd *) makeNode(BaseBackupCmd);
|
||||
BaseBackupCmd *cmd =
|
||||
(BaseBackupCmd *) makeNode(BaseBackupCmd);
|
||||
cmd->options = $2;
|
||||
$$ = (Node *) cmd;
|
||||
}
|
||||
@ -168,6 +173,11 @@ base_backup_opt:
|
||||
$$ = makeDefElem("max_rate",
|
||||
(Node *)makeInteger($2));
|
||||
}
|
||||
| K_TABLESPACE_MAP
|
||||
{
|
||||
$$ = makeDefElem("tablespace_map",
|
||||
(Node *)makeInteger(TRUE));
|
||||
}
|
||||
;
|
||||
|
||||
create_replication_slot:
|
||||
|
||||
@ -88,6 +88,7 @@ NOWAIT { return K_NOWAIT; }
|
||||
PROGRESS { return K_PROGRESS; }
|
||||
MAX_RATE { return K_MAX_RATE; }
|
||||
WAL { return K_WAL; }
|
||||
TABLESPACE_MAP { return K_TABLESPACE_MAP; }
|
||||
TIMELINE { return K_TIMELINE; }
|
||||
START_REPLICATION { return K_START_REPLICATION; }
|
||||
CREATE_REPLICATION_SLOT { return K_CREATE_REPLICATION_SLOT; }
|
||||
|
||||
@ -1652,13 +1652,14 @@ BaseBackup(void)
|
||||
maxrate_clause = psprintf("MAX_RATE %u", maxrate);
|
||||
|
||||
basebkp =
|
||||
psprintf("BASE_BACKUP LABEL '%s' %s %s %s %s %s",
|
||||
psprintf("BASE_BACKUP LABEL '%s' %s %s %s %s %s %s",
|
||||
escaped_label,
|
||||
showprogress ? "PROGRESS" : "",
|
||||
includewal && !streamwal ? "WAL" : "",
|
||||
fastcheckpoint ? "FAST" : "",
|
||||
includewal ? "NOWAIT" : "",
|
||||
maxrate_clause ? maxrate_clause : "");
|
||||
maxrate_clause ? maxrate_clause : "",
|
||||
format == 't' ? "TABLESPACE_MAP": "");
|
||||
|
||||
if (PQsendQuery(conn, basebkp) == 0)
|
||||
{
|
||||
|
||||
@ -17,6 +17,8 @@
|
||||
#include "access/xlogreader.h"
|
||||
#include "datatype/timestamp.h"
|
||||
#include "lib/stringinfo.h"
|
||||
#include "nodes/pg_list.h"
|
||||
#include "storage/fd.h"
|
||||
|
||||
|
||||
/* Sync methods */
|
||||
@ -258,7 +260,9 @@ extern void assign_checkpoint_completion_target(double newval, void *extra);
|
||||
* Starting/stopping a base backup
|
||||
*/
|
||||
extern XLogRecPtr do_pg_start_backup(const char *backupidstr, bool fast,
|
||||
TimeLineID *starttli_p, char **labelfile);
|
||||
TimeLineID *starttli_p, char **labelfile, DIR *tblspcdir,
|
||||
List **tablespaces, char **tblspcmapfile, bool infotbssize,
|
||||
bool needtblspcmapfile);
|
||||
extern XLogRecPtr do_pg_stop_backup(char *labelfile, bool waitforarchive,
|
||||
TimeLineID *stoptli_p);
|
||||
extern void do_pg_abort_backup(void);
|
||||
@ -267,4 +271,7 @@ extern void do_pg_abort_backup(void);
|
||||
#define BACKUP_LABEL_FILE "backup_label"
|
||||
#define BACKUP_LABEL_OLD "backup_label.old"
|
||||
|
||||
#define TABLESPACE_MAP "tablespace_map"
|
||||
#define TABLESPACE_MAP_OLD "tablespace_map.old"
|
||||
|
||||
#endif /* XLOG_H */
|
||||
|
||||
@ -21,6 +21,16 @@
|
||||
#define MAX_RATE_UPPER 1048576
|
||||
|
||||
|
||||
typedef struct
|
||||
{
|
||||
char *oid;
|
||||
char *path;
|
||||
char *rpath; /* relative path within PGDATA, or NULL */
|
||||
int64 size;
|
||||
} tablespaceinfo;
|
||||
|
||||
extern void SendBaseBackup(BaseBackupCmd *cmd);
|
||||
|
||||
extern int64 sendTablespace(char *path, bool sizeonly);
|
||||
|
||||
#endif /* _BASEBACKUP_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user