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Track the timeline associated with minRecoveryPoint, for more sanity checks.

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This allows recovery to notice certain incorrect recovery scenarios.
If a server has recovered to point X on timeline 5, and you restart
recovery, it better be on timeline 5 when it reaches point X again, not on
some timeline with a higher ID. This can happen e.g if you a standby server
is shut down, a new timeline appears in the WAL archive, and the standby
server is restarted. It will try to follow the new timeline, which is wrong
because some WAL on the old timeline was already replayed before shutdown.

Requires an initdb (or at least pg_resetxlog), because this adds a field to
the control file.
This commit is contained in:
Heikki Linnakangas
2012-12-04 11:24:28 +02:00
parent 2f22765607
commit 5ce108bf32
4 changed files with 68 additions and 5 deletions
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3
src/include/catalog/pg_control.h
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@@ -21,7 +21,7 @@
/* Version identifier for this pg_control format */
#define PG_CONTROL_VERSION 931
#define PG_CONTROL_VERSION 932
/*
* Body of CheckPoint XLOG records. This is declared here because we keep
@@ -153,6 +153,7 @@ typedef struct ControlFileData
* pg_start_backup() call, not accompanied by pg_stop_backup().
*/
XLogRecPtr minRecoveryPoint;
TimeLineID minRecoveryPointTLI;
XLogRecPtr backupStartPoint;
XLogRecPtr backupEndPoint;
bool backupEndRequired;