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Fix an old bug in multixact and two-phase commit. Prepared transactions can

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be part of multixacts, so allocate a slot for each prepared transaction in
the "oldest member" array in multixact.c. On PREPARE TRANSACTION, transfer
the oldest member value from the current backends slot to the prepared xact
slot. Also save and recover the value from the 2pc state file.

The symptom of the bug was that after a transaction prepared, a shared lock
still held by the prepared transaction was sometimes ignored by other
transactions.

Fix back to 8.1, where both 2PC and multixact were introduced.
This commit is contained in:
Heikki Linnakangas
2009-11-23 09:58:36 +00:00
parent c194ff20d2
commit cd87b6f8a5
7 changed files with 191 additions and 19 deletions
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5
src/backend/access/transam/xact.c
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@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.275 2009/09/01 02:54:51 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.276 2009/11/23 09:58:36 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1856,6 +1856,7 @@ PrepareTransaction(void)
AtPrepare_Inval();
AtPrepare_Locks();
AtPrepare_PgStat();
AtPrepare_MultiXact();
/*
* Here is where we really truly prepare.
@@ -1909,7 +1910,7 @@ PrepareTransaction(void)
PostPrepare_smgr();
AtEOXact_MultiXact();
PostPrepare_MultiXact(xid);
PostPrepare_Locks(xid);