database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-16 15:02:33 +03:00
Code Activity

Derive latestRemovedXid for btree deletes by reading heap pages. The

Browse Source 
WAL record for btree delete contains a list of tids, even when backup
blocks are present. We follow the tids to their heap tuples, taking
care to follow LP_REDIRECT tuples. We ignore LP_DEAD tuples on the
understanding that they will always have xmin/xmax earlier than any
LP_NORMAL tuples referred to by killed index tuples. Iff all tuples
are LP_DEAD we return InvalidTransactionId. The heap relfilenode is
added to the WAL record, requiring API changes to pass down the heap
Relation. XLOG_PAGE_MAGIC updated.
This commit is contained in:
Simon Riggs
2010-03-28 09:27:02 +00:00
parent 59292f28ca
commit a760893dbd
6 changed files with 254 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

122
src/backend/access/nbtree/nbtpage.c
View File

@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.121 2010/03/19 10:41:21 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.122 2010/03/28 09:27:01 sriggs Exp $
*
* NOTES
* Postgres btree pages look like ordinary relation pages. The opaque
@@ -719,15 +719,12 @@ _bt_page_recyclable(Page page)
* ensure correct locking.
*/
void
_bt_delitems(Relation rel, Buffer buf,
OffsetNumber *itemnos, int nitems, bool isVacuum,
BlockNumber lastBlockVacuumed)
_bt_delitems_vacuum(Relation rel, Buffer buf,
OffsetNumber *itemnos, int nitems, BlockNumber lastBlockVacuumed)
{
Page page = BufferGetPage(buf);
BTPageOpaque opaque;
Assert(isVacuum || lastBlockVacuumed == 0);
/* No ereport(ERROR) until changes are logged */
START_CRIT_SECTION();
@@ -759,35 +756,14 @@ _bt_delitems(Relation rel, Buffer buf,
XLogRecPtr recptr;
XLogRecData rdata[2];
if (isVacuum)
{
xl_btree_vacuum xlrec_vacuum;
xl_btree_vacuum xlrec_vacuum;
xlrec_vacuum.node = rel->rd_node;
xlrec_vacuum.block = BufferGetBlockNumber(buf);
xlrec_vacuum.lastBlockVacuumed = lastBlockVacuumed;
rdata[0].data = (char *) &xlrec_vacuum;
rdata[0].len = SizeOfBtreeVacuum;
}
else
{
xl_btree_delete xlrec_delete;
xlrec_delete.node = rel->rd_node;
xlrec_delete.block = BufferGetBlockNumber(buf);
/*
* XXX: We would like to set an accurate latestRemovedXid, but
* there is no easy way of obtaining a useful value. So we punt
* and store InvalidTransactionId, which forces the standby to
* wait for/cancel all currently running transactions.
*/
xlrec_delete.latestRemovedXid = InvalidTransactionId;
rdata[0].data = (char *) &xlrec_delete;
rdata[0].len = SizeOfBtreeDelete;
}
xlrec_vacuum.node = rel->rd_node;
xlrec_vacuum.block = BufferGetBlockNumber(buf);
xlrec_vacuum.lastBlockVacuumed = lastBlockVacuumed;
rdata[0].data = (char *) &xlrec_vacuum;
rdata[0].len = SizeOfBtreeVacuum;
rdata[0].buffer = InvalidBuffer;
rdata[0].next = &(rdata[1]);
@@ -810,10 +786,82 @@ _bt_delitems(Relation rel, Buffer buf,
rdata[1].buffer_std = true;
rdata[1].next = NULL;
if (isVacuum)
recptr = XLogInsert(RM_BTREE_ID, XLOG_BTREE_VACUUM, rdata);
else
recptr = XLogInsert(RM_BTREE_ID, XLOG_BTREE_DELETE, rdata);
recptr = XLogInsert(RM_BTREE_ID, XLOG_BTREE_VACUUM, rdata);
PageSetLSN(page, recptr);
PageSetTLI(page, ThisTimeLineID);
}
END_CRIT_SECTION();
}
void
_bt_delitems_delete(Relation rel, Buffer buf,
OffsetNumber *itemnos, int nitems, Relation heapRel)
{
Page page = BufferGetPage(buf);
BTPageOpaque opaque;
Assert(nitems > 0);
/* No ereport(ERROR) until changes are logged */
START_CRIT_SECTION();
/* Fix the page */
PageIndexMultiDelete(page, itemnos, nitems);
/*
* We can clear the vacuum cycle ID since this page has certainly been
* processed by the current vacuum scan.
*/
opaque = (BTPageOpaque) PageGetSpecialPointer(page);
opaque->btpo_cycleid = 0;
/*
* Mark the page as not containing any LP_DEAD items. This is not
* certainly true (there might be some that have recently been marked, but
* weren't included in our target-item list), but it will almost always be
* true and it doesn't seem worth an additional page scan to check it.
* Remember that BTP_HAS_GARBAGE is only a hint anyway.
*/
opaque->btpo_flags &= ~BTP_HAS_GARBAGE;
MarkBufferDirty(buf);
/* XLOG stuff */
if (!rel->rd_istemp)
{
XLogRecPtr recptr;
XLogRecData rdata[3];
xl_btree_delete xlrec_delete;
xlrec_delete.node = rel->rd_node;
xlrec_delete.hnode = heapRel->rd_node;
xlrec_delete.block = BufferGetBlockNumber(buf);
xlrec_delete.nitems = nitems;
rdata[0].data = (char *) &xlrec_delete;
rdata[0].len = SizeOfBtreeDelete;
rdata[0].buffer = InvalidBuffer;
rdata[0].next = &(rdata[1]);
/*
* We need the target-offsets array whether or not we store the
* to allow us to find the latestRemovedXid on a standby server.
*/
rdata[1].data = (char *) itemnos;
rdata[1].len = nitems * sizeof(OffsetNumber);
rdata[1].buffer = InvalidBuffer;
rdata[1].next = &(rdata[2]);
rdata[2].data = NULL;
rdata[2].len = 0;
rdata[2].buffer = buf;
rdata[2].buffer_std = true;
rdata[2].next = NULL;
recptr = XLogInsert(RM_BTREE_ID, XLOG_BTREE_DELETE, rdata);
PageSetLSN(page, recptr);
PageSetTLI(page, ThisTimeLineID);