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Two-phase commit. Original patch by Heikki Linnakangas, with additional

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hacking by Alvaro Herrera and Tom Lane.
This commit is contained in:
Tom Lane
2005-06-17 22:32:51 +00:00
parent 5495575903
commit d0a89683a3
61 changed files with 4454 additions and 439 deletions
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25
src/backend/access/transam/transam.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/transam.c,v 1.64 2005/02/20 21:46:48 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/transam.c,v 1.65 2005/06/17 22:32:42 tgl Exp $
*
* NOTES
* This file contains the high level access-method interface to the
@ -173,6 +173,14 @@ TransactionIdDidCommit(TransactionId transactionId)
* recursively. However, if it's older than TransactionXmin, we can't
* look at pg_subtrans; instead assume that the parent crashed without
* cleaning up its children.
*
* Originally we Assert'ed that the result of SubTransGetParent was
* not zero. However with the introduction of prepared transactions,
* there can be a window just after database startup where we do not
* have complete knowledge in pg_subtrans of the transactions after
* TransactionXmin. StartupSUBTRANS() has ensured that any missing
* information will be zeroed. Since this case should not happen under
* normal conditions, it seems reasonable to emit a WARNING for it.
*/
if (xidstatus == TRANSACTION_STATUS_SUB_COMMITTED)
{
@ -181,7 +189,12 @@ TransactionIdDidCommit(TransactionId transactionId)
if (TransactionIdPrecedes(transactionId, TransactionXmin))
return false;
parentXid = SubTransGetParent(transactionId);
Assert(TransactionIdIsValid(parentXid));
if (!TransactionIdIsValid(parentXid))
{
elog(WARNING, "no pg_subtrans entry for subcommitted XID %u",
transactionId);
return false;
}
return TransactionIdDidCommit(parentXid);
}
@ -224,7 +237,13 @@ TransactionIdDidAbort(TransactionId transactionId)
if (TransactionIdPrecedes(transactionId, TransactionXmin))
return true;
parentXid = SubTransGetParent(transactionId);
Assert(TransactionIdIsValid(parentXid));
if (!TransactionIdIsValid(parentXid))
{
/* see notes in TransactionIdDidCommit */
elog(WARNING, "no pg_subtrans entry for subcommitted XID %u",
transactionId);
return true;
}
return TransactionIdDidAbort(parentXid);
}