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Reset btpo.xact following recovery of btree delete page. Add btpo_xact

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field into WAL record and reset it from there, rather than using
FrozenTransactionId which can lead to some corner case bugs.

Problem report and suggested route to a fix from Heikki, details by me.
This commit is contained in:
Simon Riggs 2010-03-19 10:41:22 +00:00
parent 2827516394
commit 5c73ae17d1
3 changed files with 7 additions and 5 deletions
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3
src/backend/access/nbtree/nbtpage.c
View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.120 2010/02/26 02:00:34 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.121 2010/03/19 10:41:21 sriggs Exp $
*
* NOTES
* Postgres btree pages look like ordinary relation pages. The opaque
@ -1301,6 +1301,7 @@ _bt_pagedel(Relation rel, Buffer buf, BTStack stack)
xlrec.deadblk = target;
xlrec.leftblk = leftsib;
xlrec.rightblk = rightsib;
xlrec.btpo_xact = opaque->btpo.xact;
rdata[0].data = (char *) &xlrec;
rdata[0].len = SizeOfBtreeDeletePage;

4
src/backend/access/nbtree/nbtxlog.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.62 2010/02/26 02:00:34 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.63 2010/03/19 10:41:22 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -729,7 +729,7 @@ btree_xlog_delete_page(uint8 info, XLogRecPtr lsn, XLogRecord *record)
pageop->btpo_prev = leftsib;
pageop->btpo_next = rightsib;
pageop->btpo.xact = FrozenTransactionId;
pageop->btpo.xact = xlrec->btpo_xact;
pageop->btpo_flags = BTP_DELETED;
pageop->btpo_cycleid = 0;

5
src/include/access/nbtree.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.130 2010/02/26 02:01:21 momjian Exp $
* $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.131 2010/03/19 10:41:22 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -375,7 +375,7 @@ typedef struct xl_btree_vacuum
* identifies the tuple removed from the parent page (note that we remove
* this tuple's downlink and the *following* tuple's key). Note we do not
* store any content for the deleted page --- it is just rewritten as empty
* during recovery.
* during recovery, apart from resetting the btpo.xact.
*/
typedef struct xl_btree_delete_page
{
@ -383,6 +383,7 @@ typedef struct xl_btree_delete_page
BlockNumber deadblk; /* child block being deleted */
BlockNumber leftblk; /* child block's left sibling, if any */
BlockNumber rightblk; /* child block's right sibling */
TransactionId btpo_xact; /* value of btpo.xact for use in recovery */
/* xl_btree_metadata FOLLOWS IF XLOG_BTREE_DELETE_PAGE_META */
} xl_btree_delete_page;