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 240329ae66d409b4e1e8ba8a8b75733ecf59d7ac..7137d2dc08c854f432e4182554f26f9500a8c509 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 1.104 2007/07/08 22:23:16 tgl Exp $
+ *   $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.105 2007/07/20 16:29:53 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -811,6 +811,14 @@ 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 */
 
        /*