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Make pg_receivexlog and pg_basebackup -X stream work across timeline switches.

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This mirrors the changes done earlier to the server in standby mode. When
receivelog reaches the end of a timeline, as reported by the server, it
fetches the timeline history file of the next timeline, and restarts
streaming from the new timeline by issuing a new START_STREAMING command.

When pg_receivexlog crosses a timeline, it leaves the .partial suffix on the
last segment on the old timeline. This helps you to tell apart a partial
segment left in the directory because of a timeline switch, and a completed
segment. If you just follow a single server, it won't make a difference, but
it can be significant in more complicated scenarios where new WAL is still
generated on the old timeline.

This includes two small changes to the streaming replication protocol:
First, when you reach the end of timeline while streaming, the server now
sends the TLI of the next timeline in the server's history to the client.
pg_receivexlog uses that as the next timeline, so that it doesn't need to
parse the timeline history file like a standby server does. Second, when
BASE_BACKUP command sends the begin and end WAL positions, it now also sends
the timeline IDs corresponding the positions.
This commit is contained in:
Heikki Linnakangas
2013-01-17 20:23:00 +02:00
parent 8ae35e9180
commit 0b6329130e
12 changed files with 699 additions and 312 deletions
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4
src/backend/access/transam/xlogfuncs.c
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@ -56,7 +56,7 @@ pg_start_backup(PG_FUNCTION_ARGS)
backupidstr = text_to_cstring(backupid);
startpoint = do_pg_start_backup(backupidstr, fast, NULL);
startpoint = do_pg_start_backup(backupidstr, fast, NULL, NULL);
snprintf(startxlogstr, sizeof(startxlogstr), "%X/%X",
(uint32) (startpoint >> 32), (uint32) startpoint);
@ -82,7 +82,7 @@ pg_stop_backup(PG_FUNCTION_ARGS)
XLogRecPtr stoppoint;
char stopxlogstr[MAXFNAMELEN];
stoppoint = do_pg_stop_backup(NULL, true);
stoppoint = do_pg_stop_backup(NULL, true, NULL);
snprintf(stopxlogstr, sizeof(stopxlogstr), "%X/%X",
(uint32) (stoppoint >> 32), (uint32) stoppoint);