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Repair assert failure in tuple-chain-moving logic (introduced by yours 

truly, I'm afraid).
This commit is contained in:
Tom Lane 2000-04-06 00:29:51 +00:00
parent 7c6bac0071
commit eace269b47
1 changed files with 26 additions and 10 deletions
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36
src/backend/commands/vacuum.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.144 2000/03/17 02:36:06 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.145 2000/04/06 00:29:51 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1510,6 +1510,8 @@ vc_repair_frag(VRelStats *vacrelstats, Relation onerel,
ItemPointerSetInvalid(&Ctid);
for (ti = 0; ti < num_vtmove; ti++)
{
VPageDescr destvpd = vtmove[ti].vpd;
/* Get tuple from chain */
tuple.t_self = vtmove[ti].tid;
Cbuf = ReadBuffer(onerel,
@ -1521,7 +1523,7 @@ vc_repair_frag(VRelStats *vacrelstats, Relation onerel,
tuple.t_data = (HeapTupleHeader) PageGetItem(Cpage, Citemid);
tuple_len = tuple.t_len = ItemIdGetLength(Citemid);
/* Get page to move in */
cur_buffer = ReadBuffer(onerel, vtmove[ti].vpd->vpd_blkno);
cur_buffer = ReadBuffer(onerel, destvpd->vpd_blkno);
/*
* We should LockBuffer(cur_buffer) but don't, at the
@ -1530,9 +1532,24 @@ vc_repair_frag(VRelStats *vacrelstats, Relation onerel,
* to get t_infomask of inserted heap tuple !!!
*/
ToPage = BufferGetPage(cur_buffer);
/* if this page was not used before - clean it */
/*
* If this page was not used before - clean it.
*
* This path is different from the other callers of
* vc_vacpage, because we have already incremented the
* vpd's vpd_offsets_used field to account for the
* tuple(s) we expect to move onto the page. Therefore
* vc_vacpage's check for vpd_offsets_used == 0 is wrong.
* But since that's a good debugging check for all other
* callers, we work around it here rather than remove it.
*/
if (!PageIsEmpty(ToPage) && vtmove[ti].cleanVpd)
vc_vacpage(ToPage, vtmove[ti].vpd);
{
int sv_offsets_used = destvpd->vpd_offsets_used;
destvpd->vpd_offsets_used = 0;
vc_vacpage(ToPage, destvpd);
destvpd->vpd_offsets_used = sv_offsets_used;
}
heap_copytuple_with_tuple(&tuple, &newtup);
RelationInvalidateHeapTuple(onerel, &tuple);
TransactionIdStore(myXID, (TransactionId *) &(newtup.t_data->t_cmin));
@ -1543,17 +1560,16 @@ vc_repair_frag(VRelStats *vacrelstats, Relation onerel,
InvalidOffsetNumber, LP_USED);
if (newoff == InvalidOffsetNumber)
{
elog(ERROR, "\
moving chain: failed to add item with len = %u to page %u",
tuple_len, vtmove[ti].vpd->vpd_blkno);
elog(ERROR, "moving chain: failed to add item with len = %u to page %u",
tuple_len, destvpd->vpd_blkno);
}
newitemid = PageGetItemId(ToPage, newoff);
pfree(newtup.t_data);
newtup.t_datamcxt = NULL;
newtup.t_data = (HeapTupleHeader) PageGetItem(ToPage, newitemid);
ItemPointerSet(&(newtup.t_self), vtmove[ti].vpd->vpd_blkno, newoff);
if (((int) vtmove[ti].vpd->vpd_blkno) > last_move_dest_block)
last_move_dest_block = vtmove[ti].vpd->vpd_blkno;
ItemPointerSet(&(newtup.t_self), destvpd->vpd_blkno, newoff);
if (((int) destvpd->vpd_blkno) > last_move_dest_block)
last_move_dest_block = destvpd->vpd_blkno;
/*
* Set t_ctid pointing to itself for last tuple in