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

Browse Source 
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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650
src/backend/access/transam/xact.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.204 2005/06/06 20:22:57 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.205 2005/06/17 22:32:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -22,6 +22,7 @@
#include "access/multixact.h"
#include "access/subtrans.h"
#include "access/twophase.h"
#include "access/xact.h"
#include "catalog/heap.h"
#include "catalog/index.h"
@ -68,7 +69,8 @@ typedef enum TransState
TRANS_START,
TRANS_INPROGRESS,
TRANS_COMMIT,
TRANS_ABORT
TRANS_ABORT,
TRANS_PREPARE
} TransState;
/*
@ -90,6 +92,7 @@ typedef enum TBlockState
TBLOCK_ABORT, /* failed xact, awaiting ROLLBACK */
TBLOCK_ABORT_END, /* failed xact, ROLLBACK received */
TBLOCK_ABORT_PENDING, /* live xact, ROLLBACK received */
TBLOCK_PREPARE, /* live xact, PREPARE received */
/* subtransaction states */
TBLOCK_SUBBEGIN, /* starting a subtransaction */
@ -172,6 +175,12 @@ static CommandId currentCommandId;
static AbsoluteTime xactStartTime; /* integer part */
static int xactStartTimeUsec; /* microsecond part */
/*
* GID to be used for preparing the current transaction. This is also
* global to a whole transaction, so we don't keep it in the state stack.
*/
static char *prepareGID;
/*
* List of add-on start- and end-of-xact callbacks
@ -267,10 +276,12 @@ IsTransactionState(void)
return true;
case TRANS_ABORT:
return true;
case TRANS_PREPARE:
return true;
}
/*
* Shouldn't get here, but lint is not happy with this...
* Shouldn't get here, but lint is not happy without this...
*/
return false;
}
@ -660,12 +671,12 @@ void
RecordTransactionCommit(void)
{
int nrels;
RelFileNode *rptr;
RelFileNode *rels;
int nchildren;
TransactionId *children;
/* Get data needed for commit record */
nrels = smgrGetPendingDeletes(true, &rptr);
nrels = smgrGetPendingDeletes(true, &rels);
nchildren = xactGetCommittedChildren(&children);
/*
@ -726,7 +737,7 @@ RecordTransactionCommit(void)
if (nrels > 0)
{
rdata[0].next = &(rdata[1]);
rdata[1].data = (char *) rptr;
rdata[1].data = (char *) rels;
rdata[1].len = nrels * sizeof(RelFileNode);
rdata[1].buffer = InvalidBuffer;
lastrdata = 1;
@ -809,12 +820,9 @@ RecordTransactionCommit(void)
MyXactMadeXLogEntry = false;
MyXactMadeTempRelUpdate = false;
/* Show myself as out of the transaction in PGPROC array */
MyProc->logRec.xrecoff = 0;
/* And clean up local data */
if (rptr)
pfree(rptr);
if (rels)
pfree(rels);
if (children)
pfree(children);
}
@ -970,12 +978,12 @@ static void
RecordTransactionAbort(void)
{
int nrels;
RelFileNode *rptr;
RelFileNode *rels;
int nchildren;
TransactionId *children;
/* Get data needed for abort record */
nrels = smgrGetPendingDeletes(false, &rptr);
nrels = smgrGetPendingDeletes(false, &rels);
nchildren = xactGetCommittedChildren(&children);
/*
@ -1026,7 +1034,7 @@ RecordTransactionAbort(void)
if (nrels > 0)
{
rdata[0].next = &(rdata[1]);
rdata[1].data = (char *) rptr;
rdata[1].data = (char *) rels;
rdata[1].len = nrels * sizeof(RelFileNode);
rdata[1].buffer = InvalidBuffer;
lastrdata = 1;
@ -1069,12 +1077,9 @@ RecordTransactionAbort(void)
MyXactMadeXLogEntry = false;
MyXactMadeTempRelUpdate = false;
/* Show myself as out of the transaction in PGPROC array */
MyProc->logRec.xrecoff = 0;
/* And clean up local data */
if (rptr)
pfree(rptr);
if (rels)
pfree(rels);
if (children)
pfree(children);
}
@ -1166,13 +1171,13 @@ static void
RecordSubTransactionAbort(void)
{
int nrels;
RelFileNode *rptr;
RelFileNode *rels;
TransactionId xid = GetCurrentTransactionId();
int nchildren;
TransactionId *children;
/* Get data needed for abort record */
nrels = smgrGetPendingDeletes(false, &rptr);
nrels = smgrGetPendingDeletes(false, &rels);
nchildren = xactGetCommittedChildren(&children);
/*
@ -1212,7 +1217,7 @@ RecordSubTransactionAbort(void)
if (nrels > 0)
{
rdata[0].next = &(rdata[1]);
rdata[1].data = (char *) rptr;
rdata[1].data = (char *) rels;
rdata[1].len = nrels * sizeof(RelFileNode);
rdata[1].buffer = InvalidBuffer;
lastrdata = 1;
@ -1256,8 +1261,8 @@ RecordSubTransactionAbort(void)
XidCacheRemoveRunningXids(xid, nchildren, children);
/* And clean up local data */
if (rptr)
pfree(rptr);
if (rels)
pfree(rels);
if (children)
pfree(children);
}
@ -1419,8 +1424,11 @@ StartTransaction(void)
ShowTransactionState("StartTransaction");
}
/*
* CommitTransaction
*
* NB: if you change this routine, better look at PrepareTransaction too!
*/
static void
CommitTransaction(void)
@ -1510,6 +1518,8 @@ CommitTransaction(void)
* xid 0 as running as well, or it will be able to see two tuple versions
* - one deleted by xid 1 and one inserted by xid 0. See notes in
* GetSnapshotData.
*
* Note: MyProc may be null during bootstrap.
*----------
*/
if (MyProc != NULL)
@ -1608,6 +1618,225 @@ CommitTransaction(void)
RESUME_INTERRUPTS();
}
/*
* PrepareTransaction
*
* NB: if you change this routine, better look at CommitTransaction too!
*/
static void
PrepareTransaction(void)
{
TransactionState s = CurrentTransactionState;
TransactionId xid = GetCurrentTransactionId();
GlobalTransaction gxact;
ShowTransactionState("PrepareTransaction");
/*
* check the current transaction state
*/
if (s->state != TRANS_INPROGRESS)
elog(WARNING, "PrepareTransaction while in %s state",
TransStateAsString(s->state));
Assert(s->parent == NULL);
/*
* Do pre-commit processing (most of this stuff requires database
* access, and in fact could still cause an error...)
*
* It is possible for PrepareHoldablePortals to invoke functions that
* queue deferred triggers, and it's also possible that triggers create
* holdable cursors. So we have to loop until there's nothing left to
* do.
*/
for (;;)
{
/*
* Fire all currently pending deferred triggers.
*/
AfterTriggerFireDeferred();
/*
* Convert any open holdable cursors into static portals. If there
* weren't any, we are done ... otherwise loop back to check if they
* queued deferred triggers. Lather, rinse, repeat.
*/
if (!PrepareHoldablePortals())
break;
}
/* Now we can shut down the deferred-trigger manager */
AfterTriggerEndXact(true);
/* Close any open regular cursors */
AtCommit_Portals();
/*
* Let ON COMMIT management do its thing (must happen after closing
* cursors, to avoid dangling-reference problems)
*/
PreCommit_on_commit_actions();
/* close large objects before lower-level cleanup */
AtEOXact_LargeObject(true);
/* NOTIFY and flatfiles will be handled below */
/* Prevent cancel/die interrupt while cleaning up */
HOLD_INTERRUPTS();
/*
* set the current transaction state information appropriately during
* the processing
*/
s->state = TRANS_PREPARE;
/* Tell bufmgr and smgr to prepare for commit */
BufmgrCommit();
/*
* Reserve the GID for this transaction. This could fail if the
* requested GID is invalid or already in use.
*/
gxact = MarkAsPreparing(xid, MyDatabaseId, prepareGID, GetUserId());
prepareGID = NULL;
/*
* Collect data for the 2PC state file. Note that in general, no actual
* state change should happen in the called modules during this step,
* since it's still possible to fail before commit, and in that case we
* want transaction abort to be able to clean up. (In particular, the
* AtPrepare routines may error out if they find cases they cannot
* handle.) State cleanup should happen in the PostPrepare routines
* below. However, some modules can go ahead and clear state here
* because they wouldn't do anything with it during abort anyway.
*
* Note: because the 2PC state file records will be replayed in the same
* order they are made, the order of these calls has to match the order
* in which we want things to happen during COMMIT PREPARED or
* ROLLBACK PREPARED; in particular, pay attention to whether things
* should happen before or after releasing the transaction's locks.
*/
StartPrepare(gxact);
AtPrepare_Notify();
AtPrepare_UpdateFlatFiles();
AtPrepare_Inval();
AtPrepare_Locks();
/*
* Here is where we really truly prepare.
*
* We have to record transaction prepares even if we didn't
* make any updates, because the transaction manager might
* get confused if we lose a global transaction.
*/
EndPrepare(gxact);
/*
* Mark the prepared transaction as valid. As soon as we mark ourselves
* not running in MyProc below, others can commit/rollback the xact.
*
* NB: a side effect of this is to make a dummy ProcArray entry for the
* prepared XID. This must happen before we clear the XID from MyProc,
* else there is a window where the XID is not running according to
* TransactionIdInProgress, and onlookers would be entitled to assume
* the xact crashed. Instead we have a window where the same XID
* appears twice in ProcArray, which is OK.
*/
MarkAsPrepared(gxact);
/*
* Now we clean up backend-internal state and release internal
* resources.
*/
/* Break the chain of back-links in the XLOG records I output */
MyLastRecPtr.xrecoff = 0;
MyXactMadeXLogEntry = false;
MyXactMadeTempRelUpdate = false;
/*
* Let others know about no transaction in progress by me. This has
* to be done *after* the prepared transaction has been marked valid,
* else someone may think it is unlocked and recyclable.
*/
/* Lock ProcArrayLock because that's what GetSnapshotData uses. */
LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
MyProc->xid = InvalidTransactionId;
MyProc->xmin = InvalidTransactionId;
/* Clear the subtransaction-XID cache too while holding the lock */
MyProc->subxids.nxids = 0;
MyProc->subxids.overflowed = false;
LWLockRelease(ProcArrayLock);
/*
* This is all post-transaction cleanup. Note that if an error is raised
* here, it's too late to abort the transaction. This should be just
* noncritical resource releasing. See notes in CommitTransaction.
*/
CallXactCallbacks(XACT_EVENT_PREPARE);
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_BEFORE_LOCKS,
true, true);
/* Check we've released all buffer pins */
AtEOXact_Buffers(true);
/* notify and flatfiles don't need a postprepare call */
PostPrepare_Inval();
PostPrepare_smgr();
AtEOXact_MultiXact();
PostPrepare_Locks(xid);
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_LOCKS,
true, true);
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_AFTER_LOCKS,
true, true);
/* PREPARE acts the same as COMMIT as far as GUC is concerned */
AtEOXact_GUC(true, false);
AtEOXact_SPI(true);
AtEOXact_on_commit_actions(true);
AtEOXact_Namespace(true);
/* smgrcommit already done */
AtEOXact_Files();
CurrentResourceOwner = NULL;
ResourceOwnerDelete(TopTransactionResourceOwner);
s->curTransactionOwner = NULL;
CurTransactionResourceOwner = NULL;
TopTransactionResourceOwner = NULL;
AtCommit_Memory();
s->transactionId = InvalidTransactionId;
s->subTransactionId = InvalidSubTransactionId;
s->nestingLevel = 0;
s->childXids = NIL;
/*
* done with 1st phase commit processing, set current transaction
* state back to default
*/
s->state = TRANS_DEFAULT;
RESUME_INTERRUPTS();
}
/*
* AbortTransaction
*/
@ -1640,7 +1869,7 @@ AbortTransaction(void)
/*
* check the current transaction state
*/
if (s->state != TRANS_INPROGRESS)
if (s->state != TRANS_INPROGRESS && s->state != TRANS_PREPARE)
elog(WARNING, "AbortTransaction while in %s state",
TransStateAsString(s->state));
Assert(s->parent == NULL);
@ -1833,6 +2062,7 @@ StartTransactionCommand(void)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(ERROR, "StartTransactionCommand: unexpected state %s",
BlockStateAsString(s->blockState));
break;
@ -1934,6 +2164,15 @@ CommitTransactionCommand(void)
s->blockState = TBLOCK_DEFAULT;
break;
/*
* We are completing a "PREPARE TRANSACTION" command. Do it and
* return to the idle state.
*/
case TBLOCK_PREPARE:
PrepareTransaction();
s->blockState = TBLOCK_DEFAULT;
break;
/*
* We were just issued a SAVEPOINT inside a transaction block.
* Start a subtransaction. (DefineSavepoint already did
@ -1964,6 +2203,12 @@ CommitTransactionCommand(void)
CommitTransaction();
s->blockState = TBLOCK_DEFAULT;
}
else if (s->blockState == TBLOCK_PREPARE)
{
Assert(s->parent == NULL);
PrepareTransaction();
s->blockState = TBLOCK_DEFAULT;
}
else
{
Assert(s->blockState == TBLOCK_INPROGRESS ||
@ -2155,6 +2400,17 @@ AbortCurrentTransaction(void)
s->blockState = TBLOCK_DEFAULT;
break;
/*
* Here, we failed while trying to PREPARE. Clean up the
* transaction and return to idle state (we do not want to
* stay in the transaction).
*/
case TBLOCK_PREPARE:
AbortTransaction();
CleanupTransaction();
s->blockState = TBLOCK_DEFAULT;
break;
/*
* We got an error inside a subtransaction. Abort just the
* subtransaction, and go to the persistent SUBABORT state
@ -2487,12 +2743,64 @@ BeginTransactionBlock(void)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(FATAL, "BeginTransactionBlock: unexpected state %s",
BlockStateAsString(s->blockState));
break;
}
}
/*
* PrepareTransactionBlock
* This executes a PREPARE command.
*
* Since PREPARE may actually do a ROLLBACK, the result indicates what
* happened: TRUE for PREPARE, FALSE for ROLLBACK.
*
* Note that we don't actually do anything here except change blockState.
* The real work will be done in the upcoming PrepareTransaction().
* We do it this way because it's not convenient to change memory context,
* resource owner, etc while executing inside a Portal.
*/
bool
PrepareTransactionBlock(char *gid)
{
TransactionState s;
bool result;
/* Set up to commit the current transaction */
result = EndTransactionBlock();
/* If successful, change outer tblock state to PREPARE */
if (result)
{
s = CurrentTransactionState;
while (s->parent != NULL)
s = s->parent;
if (s->blockState == TBLOCK_END)
{
/* Save GID where PrepareTransaction can find it again */
prepareGID = MemoryContextStrdup(TopTransactionContext, gid);
s->blockState = TBLOCK_PREPARE;
}
else
{
/*
* ignore case where we are not in a transaction;
* EndTransactionBlock already issued a warning.
*/
Assert(s->blockState == TBLOCK_STARTED);
/* Don't send back a PREPARE result tag... */
result = false;
}
}
return result;
}
/*
* EndTransactionBlock
* This executes a COMMIT command.
@ -2603,6 +2911,7 @@ EndTransactionBlock(void)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(FATAL, "EndTransactionBlock: unexpected state %s",
BlockStateAsString(s->blockState));
break;
@ -2694,6 +3003,7 @@ UserAbortTransactionBlock(void)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(FATAL, "UserAbortTransactionBlock: unexpected state %s",
BlockStateAsString(s->blockState));
break;
@ -2740,6 +3050,7 @@ DefineSavepoint(char *name)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(FATAL, "DefineSavepoint: unexpected state %s",
BlockStateAsString(s->blockState));
break;
@ -2795,6 +3106,7 @@ ReleaseSavepoint(List *options)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(FATAL, "ReleaseSavepoint: unexpected state %s",
BlockStateAsString(s->blockState));
break;
@ -2892,6 +3204,7 @@ RollbackToSavepoint(List *options)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(FATAL, "RollbackToSavepoint: unexpected state %s",
BlockStateAsString(s->blockState));
break;
@ -2999,6 +3312,7 @@ BeginInternalSubTransaction(char *name)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(FATAL, "BeginInternalSubTransaction: unexpected state %s",
BlockStateAsString(s->blockState));
break;
@ -3064,6 +3378,7 @@ RollbackAndReleaseCurrentSubTransaction(void)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBRESTART:
case TBLOCK_SUBABORT_RESTART:
case TBLOCK_PREPARE:
elog(FATAL, "RollbackAndReleaseCurrentSubTransaction: unexpected state %s",
BlockStateAsString(s->blockState));
break;
@ -3111,6 +3426,7 @@ AbortOutOfAnyTransaction(void)
case TBLOCK_INPROGRESS:
case TBLOCK_END:
case TBLOCK_ABORT_PENDING:
case TBLOCK_PREPARE:
/* In a transaction, so clean up */
AbortTransaction();
CleanupTransaction();
@ -3202,6 +3518,7 @@ TransactionBlockStatusCode(void)
case TBLOCK_SUBINPROGRESS:
case TBLOCK_END:
case TBLOCK_SUBEND:
case TBLOCK_PREPARE:
return 'T'; /* in transaction */
case TBLOCK_ABORT:
case TBLOCK_SUBABORT:
@ -3684,6 +4001,8 @@ BlockStateAsString(TBlockState blockState)
return "ABORT END";
case TBLOCK_ABORT_PENDING:
return "ABORT PEND";
case TBLOCK_PREPARE:
return "PREPARE";
case TBLOCK_SUBBEGIN:
return "SUB BEGIN";
case TBLOCK_SUBINPROGRESS:
@ -3717,12 +4036,14 @@ TransStateAsString(TransState state)
return "DEFAULT";
case TRANS_START:
return "START";
case TRANS_INPROGRESS:
return "INPROGR";
case TRANS_COMMIT:
return "COMMIT";
case TRANS_ABORT:
return "ABORT";
case TRANS_INPROGRESS:
return "INPROGR";
case TRANS_PREPARE:
return "PREPARE";
}
return "UNRECOGNIZED";
}
@ -3767,6 +4088,76 @@ xactGetCommittedChildren(TransactionId **ptr)
* XLOG support routines
*/
static void
xact_redo_commit(xl_xact_commit *xlrec, TransactionId xid)
{
TransactionId *sub_xids;
TransactionId max_xid;
int i;
TransactionIdCommit(xid);
/* Mark committed subtransactions as committed */
sub_xids = (TransactionId *) &(xlrec->xnodes[xlrec->nrels]);
TransactionIdCommitTree(xlrec->nsubxacts, sub_xids);
/* Make sure nextXid is beyond any XID mentioned in the record */
max_xid = xid;
for (i = 0; i < xlrec->nsubxacts; i++)
{
if (TransactionIdPrecedes(max_xid, sub_xids[i]))
max_xid = sub_xids[i];
}
if (TransactionIdFollowsOrEquals(max_xid,
ShmemVariableCache->nextXid))
{
ShmemVariableCache->nextXid = max_xid;
TransactionIdAdvance(ShmemVariableCache->nextXid);
}
/* Make sure files supposed to be dropped are dropped */
for (i = 0; i < xlrec->nrels; i++)
{
XLogCloseRelation(xlrec->xnodes[i]);
smgrdounlink(smgropen(xlrec->xnodes[i]), false, true);
}
}
static void
xact_redo_abort(xl_xact_abort *xlrec, TransactionId xid)
{
TransactionId *sub_xids;
TransactionId max_xid;
int i;
TransactionIdAbort(xid);
/* Mark subtransactions as aborted */
sub_xids = (TransactionId *) &(xlrec->xnodes[xlrec->nrels]);
TransactionIdAbortTree(xlrec->nsubxacts, sub_xids);
/* Make sure nextXid is beyond any XID mentioned in the record */
max_xid = xid;
for (i = 0; i < xlrec->nsubxacts; i++)
{
if (TransactionIdPrecedes(max_xid, sub_xids[i]))
max_xid = sub_xids[i];
}
if (TransactionIdFollowsOrEquals(max_xid,
ShmemVariableCache->nextXid))
{
ShmemVariableCache->nextXid = max_xid;
TransactionIdAdvance(ShmemVariableCache->nextXid);
}
/* Make sure files supposed to be dropped are dropped */
for (i = 0; i < xlrec->nrels; i++)
{
XLogCloseRelation(xlrec->xnodes[i]);
smgrdounlink(smgropen(xlrec->xnodes[i]), false, true);
}
}
void
xact_redo(XLogRecPtr lsn, XLogRecord *record)
{
@ -3775,138 +4166,137 @@ xact_redo(XLogRecPtr lsn, XLogRecord *record)
if (info == XLOG_XACT_COMMIT)
{
xl_xact_commit *xlrec = (xl_xact_commit *) XLogRecGetData(record);
TransactionId *sub_xids;
TransactionId max_xid;
int i;
TransactionIdCommit(record->xl_xid);
/* Mark committed subtransactions as committed */
sub_xids = (TransactionId *) &(xlrec->xnodes[xlrec->nrels]);
TransactionIdCommitTree(xlrec->nsubxacts, sub_xids);
/* Make sure nextXid is beyond any XID mentioned in the record */
max_xid = record->xl_xid;
for (i = 0; i < xlrec->nsubxacts; i++)
{
if (TransactionIdPrecedes(max_xid, sub_xids[i]))
max_xid = sub_xids[i];
}
if (TransactionIdFollowsOrEquals(max_xid,
ShmemVariableCache->nextXid))
{
ShmemVariableCache->nextXid = max_xid;
TransactionIdAdvance(ShmemVariableCache->nextXid);
}
/* Make sure files supposed to be dropped are dropped */
for (i = 0; i < xlrec->nrels; i++)
{
XLogCloseRelation(xlrec->xnodes[i]);
smgrdounlink(smgropen(xlrec->xnodes[i]), false, true);
}
xact_redo_commit(xlrec, record->xl_xid);
}
else if (info == XLOG_XACT_ABORT)
{
xl_xact_abort *xlrec = (xl_xact_abort *) XLogRecGetData(record);
TransactionId *sub_xids;
TransactionId max_xid;
int i;
TransactionIdAbort(record->xl_xid);
xact_redo_abort(xlrec, record->xl_xid);
}
else if (info == XLOG_XACT_PREPARE)
{
/* the record contents are exactly the 2PC file */
RecreateTwoPhaseFile(record->xl_xid,
XLogRecGetData(record), record->xl_len);
}
else if (info == XLOG_XACT_COMMIT_PREPARED)
{
xl_xact_commit_prepared *xlrec = (xl_xact_commit_prepared *) XLogRecGetData(record);
/* Mark subtransactions as aborted */
sub_xids = (TransactionId *) &(xlrec->xnodes[xlrec->nrels]);
TransactionIdAbortTree(xlrec->nsubxacts, sub_xids);
xact_redo_commit(&xlrec->crec, xlrec->xid);
RemoveTwoPhaseFile(xlrec->xid, false);
}
else if (info == XLOG_XACT_ABORT_PREPARED)
{
xl_xact_abort_prepared *xlrec = (xl_xact_abort_prepared *) XLogRecGetData(record);
/* Make sure nextXid is beyond any XID mentioned in the record */
max_xid = record->xl_xid;
for (i = 0; i < xlrec->nsubxacts; i++)
{
if (TransactionIdPrecedes(max_xid, sub_xids[i]))
max_xid = sub_xids[i];
}
if (TransactionIdFollowsOrEquals(max_xid,
ShmemVariableCache->nextXid))
{
ShmemVariableCache->nextXid = max_xid;
TransactionIdAdvance(ShmemVariableCache->nextXid);
}
/* Make sure files supposed to be dropped are dropped */
for (i = 0; i < xlrec->nrels; i++)
{
XLogCloseRelation(xlrec->xnodes[i]);
smgrdounlink(smgropen(xlrec->xnodes[i]), false, true);
}
xact_redo_abort(&xlrec->arec, xlrec->xid);
RemoveTwoPhaseFile(xlrec->xid, false);
}
else
elog(PANIC, "xact_redo: unknown op code %u", info);
}
static void
xact_desc_commit(char *buf, xl_xact_commit *xlrec)
{
struct tm *tm = localtime(&xlrec->xtime);
int i;
sprintf(buf + strlen(buf), "%04u-%02u-%02u %02u:%02u:%02u",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
if (xlrec->nrels > 0)
{
sprintf(buf + strlen(buf), "; rels:");
for (i = 0; i < xlrec->nrels; i++)
{
RelFileNode rnode = xlrec->xnodes[i];
sprintf(buf + strlen(buf), " %u/%u/%u",
rnode.spcNode, rnode.dbNode, rnode.relNode);
}
}
if (xlrec->nsubxacts > 0)
{
TransactionId *xacts = (TransactionId *)
&xlrec->xnodes[xlrec->nrels];
sprintf(buf + strlen(buf), "; subxacts:");
for (i = 0; i < xlrec->nsubxacts; i++)
sprintf(buf + strlen(buf), " %u", xacts[i]);
}
}
static void
xact_desc_abort(char *buf, xl_xact_abort *xlrec)
{
struct tm *tm = localtime(&xlrec->xtime);
int i;
sprintf(buf + strlen(buf), "%04u-%02u-%02u %02u:%02u:%02u",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
if (xlrec->nrels > 0)
{
sprintf(buf + strlen(buf), "; rels:");
for (i = 0; i < xlrec->nrels; i++)
{
RelFileNode rnode = xlrec->xnodes[i];
sprintf(buf + strlen(buf), " %u/%u/%u",
rnode.spcNode, rnode.dbNode, rnode.relNode);
}
}
if (xlrec->nsubxacts > 0)
{
TransactionId *xacts = (TransactionId *)
&xlrec->xnodes[xlrec->nrels];
sprintf(buf + strlen(buf), "; subxacts:");
for (i = 0; i < xlrec->nsubxacts; i++)
sprintf(buf + strlen(buf), " %u", xacts[i]);
}
}
void
xact_desc(char *buf, uint8 xl_info, char *rec)
{
uint8 info = xl_info & ~XLR_INFO_MASK;
int i;
if (info == XLOG_XACT_COMMIT)
{
xl_xact_commit *xlrec = (xl_xact_commit *) rec;
struct tm *tm = localtime(&xlrec->xtime);
sprintf(buf + strlen(buf), "commit: %04u-%02u-%02u %02u:%02u:%02u",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
if (xlrec->nrels > 0)
{
sprintf(buf + strlen(buf), "; rels:");
for (i = 0; i < xlrec->nrels; i++)
{
RelFileNode rnode = xlrec->xnodes[i];
sprintf(buf + strlen(buf), " %u/%u/%u",
rnode.spcNode, rnode.dbNode, rnode.relNode);
}
}
if (xlrec->nsubxacts > 0)
{
TransactionId *xacts = (TransactionId *)
&xlrec->xnodes[xlrec->nrels];
sprintf(buf + strlen(buf), "; subxacts:");
for (i = 0; i < xlrec->nsubxacts; i++)
sprintf(buf + strlen(buf), " %u", xacts[i]);
}
strcat(buf, "commit: ");
xact_desc_commit(buf, xlrec);
}
else if (info == XLOG_XACT_ABORT)
{
xl_xact_abort *xlrec = (xl_xact_abort *) rec;
struct tm *tm = localtime(&xlrec->xtime);
sprintf(buf + strlen(buf), "abort: %04u-%02u-%02u %02u:%02u:%02u",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
if (xlrec->nrels > 0)
{
sprintf(buf + strlen(buf), "; rels:");
for (i = 0; i < xlrec->nrels; i++)
{
RelFileNode rnode = xlrec->xnodes[i];
strcat(buf, "abort: ");
xact_desc_abort(buf, xlrec);
}
else if (info == XLOG_XACT_PREPARE)
{
strcat(buf, "prepare");
}
else if (info == XLOG_XACT_COMMIT_PREPARED)
{
xl_xact_commit_prepared *xlrec = (xl_xact_commit_prepared *) rec;
sprintf(buf + strlen(buf), " %u/%u/%u",
rnode.spcNode, rnode.dbNode, rnode.relNode);
}
}
if (xlrec->nsubxacts > 0)
{
TransactionId *xacts = (TransactionId *)
&xlrec->xnodes[xlrec->nrels];
sprintf(buf + strlen(buf), "commit %u: ", xlrec->xid);
xact_desc_commit(buf, &xlrec->crec);
}
else if (info == XLOG_XACT_ABORT_PREPARED)
{
xl_xact_abort_prepared *xlrec = (xl_xact_abort_prepared *) rec;
sprintf(buf + strlen(buf), "; subxacts:");
for (i = 0; i < xlrec->nsubxacts; i++)
sprintf(buf + strlen(buf), " %u", xacts[i]);
}
sprintf(buf + strlen(buf), "abort %u: ", xlrec->xid);
xact_desc_abort(buf, &xlrec->arec);
}
else
strcat(buf, "UNKNOWN");