Allow_TLI_Increment_without_Checkpoint_20120618.patch

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 0d68760..70b4972 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -5276,6 +5276,7 @@ BootStrapXLOG(void)
 	ControlFile->system_identifier = sysidentifier;
 	ControlFile->state = DB_SHUTDOWNED;
 	ControlFile->time = checkPoint.time;
+	ControlFile->latestTLI = ThisTimeLineID;
 	ControlFile->checkPoint = checkPoint.redo;
 	ControlFile->checkPointCopy = checkPoint;
 
@@ -6083,7 +6084,7 @@ StartupXLOG(void)
 	 * Initialize on the assumption we want to recover to the same timeline
 	 * that's active according to pg_control.
 	 */
-	recoveryTargetTLI = ControlFile->checkPointCopy.ThisTimeLineID;
+	recoveryTargetTLI = ControlFile->latestTLI;
 
 	/*
 	 * Check for recovery control file, and if so set up state for offline
@@ -6100,11 +6101,11 @@ StartupXLOG(void)
 	 * timeline.
 	 */
 	if (!list_member_int(expectedTLIs,
-						 (int) ControlFile->checkPointCopy.ThisTimeLineID))
+						 (int) ControlFile->latestTLI))
 		ereport(FATAL,
 				(errmsg("requested timeline %u is not a child of database system timeline %u",
 						recoveryTargetTLI,
-						ControlFile->checkPointCopy.ThisTimeLineID)));
+						ControlFile->latestTLI)));
 
 	/*
 	 * Save the selected recovery target timeline ID and
@@ -6791,9 +6792,12 @@ StartupXLOG(void)
 	 *
 	 * In a normal crash recovery, we can just extend the timeline we were in.
 	 */
+
+	ThisTimeLineID = findNewestTimeLine(recoveryTargetTLI);
+	
 	if (InArchiveRecovery)
 	{
-		ThisTimeLineID = findNewestTimeLine(recoveryTargetTLI) + 1;
+		ThisTimeLineID++;
 		ereport(LOG,
 				(errmsg("selected new timeline ID: %u", ThisTimeLineID)));
 		writeTimeLineHistory(ThisTimeLineID, recoveryTargetTLI,
@@ -6946,6 +6950,7 @@ StartupXLOG(void)
 	LWLockAcquire(ControlFileLock, LW_EXCLUSIVE);
 	ControlFile->state = DB_IN_PRODUCTION;
 	ControlFile->time = (pg_time_t) time(NULL);
+	ControlFile->latestTLI = ThisTimeLineID;
 	UpdateControlFile();
 	LWLockRelease(ControlFileLock);
 
@@ -8710,12 +8715,6 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
 			SpinLockRelease(&xlogctl->info_lck);
 		}
 
-		/* TLI should not change in an on-line checkpoint */
-		if (checkPoint.ThisTimeLineID != ThisTimeLineID)
-			ereport(PANIC,
-					(errmsg("unexpected timeline ID %u (should be %u) in checkpoint record",
-							checkPoint.ThisTimeLineID, ThisTimeLineID)));
-
 		RecoveryRestartPoint(&checkPoint);
 	}
 	else if (info == XLOG_NOOP)
diff --git a/src/bin/pg_controldata/pg_controldata.c b/src/bin/pg_controldata/pg_controldata.c
index 38c263c..7f2cdb8 100644
--- a/src/bin/pg_controldata/pg_controldata.c
+++ b/src/bin/pg_controldata/pg_controldata.c
@@ -192,6 +192,8 @@ main(int argc, char *argv[])
 		   dbState(ControlFile.state));
 	printf(_("pg_control last modified:             %s\n"),
 		   pgctime_str);
+	printf(_("Latest timeline ID:                   %d\n"),
+		   ControlFile.latestTLI);
 	printf(_("Latest checkpoint location:           %X/%X\n"),
 		   ControlFile.checkPoint.xlogid,
 		   ControlFile.checkPoint.xrecoff);
diff --git a/src/include/catalog/pg_control.h b/src/include/catalog/pg_control.h
index 5cff396..c78d483 100644
--- a/src/include/catalog/pg_control.h
+++ b/src/include/catalog/pg_control.h
@@ -21,7 +21,7 @@
 
 
 /* Version identifier for this pg_control format */
-#define PG_CONTROL_VERSION	922
+#define PG_CONTROL_VERSION	923
 
 /*
  * Body of CheckPoint XLOG records.  This is declared here because we keep
@@ -116,6 +116,7 @@ typedef struct ControlFileData
 	 */
 	DBState		state;			/* see enum above */
 	pg_time_t	time;			/* time stamp of last pg_control update */
+	TimeLineID  latestTLI;      /* latest TLI we reached */
 	XLogRecPtr	checkPoint;		/* last check point record ptr */
 	XLogRecPtr	prevCheckPoint; /* previous check point record ptr */