Fix WAL replay of truncate operations to cope with the possibility that the

truncated relation was deleted later in the WAL sequence.  Since replay
normally auto-creates a relation upon its first reference by a WAL log entry,
failure is seen only if the truncate entry happens to be the first reference
after the checkpoint we're restarting from; which is a pretty unusual case but
of course not impossible.  Fix by making truncate entries auto-create like
the other ones do.  Per report and test case from Dharmendra Goyal.

diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index 3d4f5b5ccd8c5696ec312b9c3db9fce0e42c285d..8831edac701357f1530b7fdae20c69762cb45453 100644 (file)
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.101.2.1 2007/07/08 22:23:25 tgl Exp $
+ *       $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.101.2.2 2007/07/20 16:29:59 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -912,6 +912,14 @@ smgr_redo(XLogRecPtr lsn, XLogRecord *record)
 
                reln = smgropen(xlrec->rnode);
 
+               /*
+                * Forcibly create relation if it doesn't exist (which suggests that
+                * it was dropped somewhere later in the WAL sequence).  As in
+                * XLogOpenRelation, we prefer to recreate the rel and replay the
+                * log as best we can until the drop is seen.
+                */
+               smgrcreate(reln, false, true);
+
                /* Can't use smgrtruncate because it would try to xlog */
 
                /*