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Cleanup initialization of Hot Standby. Clarify working with reanalysis

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of requirements and documentation on LogStandbySnapshot(). Fixes
two minor bugs reported by Tom Lane that would lead to an incorrect
snapshot after transaction wraparound. Also fix two other problems
discovered that would give incorrect snapshots in certain cases.
ProcArrayApplyRecoveryInfo() substantially rewritten. Some minor
refactoring of xact_redo_apply() and ExpireTreeKnownAssignedTransactionIds().
This commit is contained in:
Simon Riggs
2010-05-13 11:15:38 +00:00
parent c2e7f78abe
commit 8431e296ea
6 changed files with 254 additions and 122 deletions
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5
src/include/storage/procarray.h
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@ -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/storage/procarray.h,v 1.31 2010/01/23 16:37:12 sriggs Exp $
* $PostgreSQL: pgsql/src/include/storage/procarray.h,v 1.32 2010/05/13 11:15:38 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -35,7 +35,8 @@ extern void ProcArrayApplyXidAssignment(TransactionId topxid,
extern void RecordKnownAssignedTransactionIds(TransactionId xid);
extern void ExpireTreeKnownAssignedTransactionIds(TransactionId xid,
int nsubxids, TransactionId *subxids);
int nsubxids, TransactionId *subxids,
TransactionId max_xid);
extern void ExpireAllKnownAssignedTransactionIds(void);
extern void ExpireOldKnownAssignedTransactionIds(TransactionId xid);

4
src/include/storage/standby.h
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@ -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/storage/standby.h,v 1.9 2010/02/26 02:01:28 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/standby.h,v 1.10 2010/05/13 11:15:38 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -68,6 +68,7 @@ typedef struct xl_running_xacts
bool subxid_overflow; /* snapshot overflowed, subxids missing */
TransactionId nextXid; /* copy of ShmemVariableCache->nextXid */
TransactionId oldestRunningXid; /* *not* oldestXmin */
TransactionId latestCompletedXid; /* so we can set xmax */
TransactionId xids[1]; /* VARIABLE LENGTH ARRAY */
} xl_running_xacts;
@ -97,6 +98,7 @@ typedef struct RunningTransactionsData
bool subxid_overflow; /* snapshot overflowed, subxids missing */
TransactionId nextXid; /* copy of ShmemVariableCache->nextXid */
TransactionId oldestRunningXid; /* *not* oldestXmin */
TransactionId latestCompletedXid; /* so we can set xmax */
TransactionId *xids; /* array of (sub)xids still running */
} RunningTransactionsData;