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Change a couple of "can't happen" error messages to be a shade more 

verbose when they do happen.  The "left link changed unexpectedly"
one in particular has been seen more than once in the field.
This commit is contained in:
Tom Lane 2005-08-12 14:34:14 +00:00
parent 3ae7e4a33b
commit 6ea05c16a4
1 changed files with 7 additions and 5 deletions
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12
src/backend/access/nbtree/nbtpage.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.86 2005/06/06 20:22:57 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.87 2005/08/12 14:34:14 tgl Exp $
*
* NOTES
* Postgres btree pages look like ordinary relation pages. The opaque
@ -826,7 +826,8 @@ _bt_pagedel(Relation rel, Buffer buf, bool vacuum_full)
_bt_relbuf(rel, lbuf);
if (leftsib == P_NONE)
{
elog(LOG, "no left sibling (concurrent deletion?)");
elog(LOG, "no left sibling (concurrent deletion?) in \"%s\"",
RelationGetRelationName(rel));
return 0;
}
lbuf = _bt_getbuf(rel, leftsib, BT_WRITE);
@ -861,7 +862,8 @@ _bt_pagedel(Relation rel, Buffer buf, bool vacuum_full)
return 0;
}
if (opaque->btpo_prev != leftsib)
elog(ERROR, "left link changed unexpectedly");
elog(ERROR, "left link changed unexpectedly in block %u of \"%s\"",
target, RelationGetRelationName(rel));
/*
* And next write-lock the (current) right sibling.
@ -984,8 +986,8 @@ _bt_pagedel(Relation rel, Buffer buf, bool vacuum_full)
itemid = PageGetItemId(page, nextoffset);
btitem = (BTItem) PageGetItem(page, itemid);
if (ItemPointerGetBlockNumber(&(btitem->bti_itup.t_tid)) != rightsib)
elog(PANIC, "right sibling is not next child");
elog(PANIC, "right sibling is not next child in \"%s\"",
RelationGetRelationName(rel));
PageIndexTupleDelete(page, nextoffset);
}