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Prevent WAL files created by pg_basebackup -x/X from being archived again.

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WAL (and timeline history) files created by pg_basebackup did not
maintain the new base backup's archive status. That's currently not a
problem if the new node is used as a standby - but if that node is
promoted all still existing files can get archived again.  With a high
wal_keep_segment settings that can happen a significant time later -
which is quite confusing.

Change both the backend (for the -x/-X fetch case) and pg_basebackup
(for -X stream) itself to always mark WAL/timeline files included in
the base backup as .done. That's in line with walreceiver.c doing so.

The verbosity of the pg_basebackup changes show pretty clearly that it
needs some refactoring, but that'd result in not be backpatchable
changes.

Backpatch to 9.1 where pg_basebackup was introduced.

Discussion: 20141205002854.GE21964@awork2.anarazel.de
This commit is contained in:
Andres Freund 2015-01-03 20:51:52 +01:00
parent 6dd305029e
commit 2a0bfa4d66
1 changed files with 20 additions and 0 deletions
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20
src/backend/replication/basebackup.c
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@ -257,7 +257,9 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
while (true)
{
/* Send another xlog segment */
char sn[MAXPGPATH];
char fn[MAXPGPATH];
char pathbuf[MAXPGPATH];
int i;
XLogFilePath(fn, ThisTimeLineID, logid, logseg);
@ -290,6 +292,15 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
* boundary, so padding is never necessary.
*/
/*
* Mark file as archived, otherwise files can get archived again
* after promotion of a new node. This is in line with
* walreceiver.c always doing a XLogArchiveForceDone() after a
* complete segment.
*/
XLogFileName(sn, ThisTimeLineID, logid, logseg);
StatusFilePath(pathbuf, sn, ".done");
sendFileWithContent(pathbuf, "");
/* Advance to the next WAL file */
NextLogSeg(logid, logseg);
@ -715,6 +726,15 @@ sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces)
_tarWriteHeader(pathbuf + basepathlen + 1, NULL, &statbuf);
}
size += 512; /* Size of the header just added */
/*
* Also send archive_status directory (by hackishly reusing
* statbuf from above ...).
*/
if (!sizeonly)
_tarWriteHeader("./pg_xlog/archive_status", NULL, &statbuf);
size += 512; /* Size of the header just added */
continue; /* don't recurse into pg_xlog */
}