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Fix possible recovery trouble if TRUNCATE overlaps a checkpoint.

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If TRUNCATE causes some buffers to be invalidated and thus the
checkpoint does not flush them, TRUNCATE must also ensure that the
corresponding files are truncated on disk. Otherwise, a replay
from the checkpoint might find that the buffers exist but have
the wrong contents, which may cause replay to fail.

Report by Teja Mupparti. Patch by Kyotaro Horiguchi, per a design
suggestion from Heikki Linnakangas, with some changes to the
comments by me. Review of this and a prior patch that approached
the issue differently by Heikki Linnakangas, Andres Freund, Álvaro
Herrera, Masahiko Sawada, and Tom Lane.

Discussion: http://postgr.es/m/BYAPR06MB6373BF50B469CA393C614257ABF00@BYAPR06MB6373.namprd06.prod.outlook.com
This commit is contained in:
Robert Haas
2022-03-24 14:32:06 -04:00
parent 86459b3296
commit 412ad7a556
11 changed files with 120 additions and 28 deletions
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26
src/backend/storage/ipc/procarray.c
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@@ -698,7 +698,10 @@ ProcArrayEndTransaction(PGPROC *proc, TransactionId latestXid)
proc->lxid = InvalidLocalTransactionId;
proc->xmin = InvalidTransactionId;
proc->delayChkpt = false; /* be sure this is cleared in abort */
/* be sure this is cleared in abort */
proc->delayChkpt = 0;
proc->recoveryConflictPending = false;
/* must be cleared with xid/xmin: */
@@ -737,7 +740,10 @@ ProcArrayEndTransactionInternal(PGPROC *proc, TransactionId latestXid)
proc->xid = InvalidTransactionId;
proc->lxid = InvalidLocalTransactionId;
proc->xmin = InvalidTransactionId;
proc->delayChkpt = false; /* be sure this is cleared in abort */
/* be sure this is cleared in abort */
proc->delayChkpt = 0;
proc->recoveryConflictPending = false;
/* must be cleared with xid/xmin: */
@@ -3053,7 +3059,8 @@ GetOldestSafeDecodingTransactionId(bool catalogOnly)
* delaying checkpoint because they have critical actions in progress.
*
* Constructs an array of VXIDs of transactions that are currently in commit
* critical sections, as shown by having delayChkpt set in their PGPROC.
* critical sections, as shown by having specified delayChkpt bits set in their
* PGPROC.
*
* Returns a palloc'd array that should be freed by the caller.
* *nvxids is the number of valid entries.
@@ -3067,13 +3074,15 @@ GetOldestSafeDecodingTransactionId(bool catalogOnly)
* for clearing of delayChkpt to propagate is unimportant for correctness.
*/
VirtualTransactionId *
GetVirtualXIDsDelayingChkpt(int *nvxids)
GetVirtualXIDsDelayingChkpt(int *nvxids, int type)
{
VirtualTransactionId *vxids;
ProcArrayStruct *arrayP = procArray;
int count = 0;
int index;
Assert(type != 0);
/* allocate what's certainly enough result space */
vxids = (VirtualTransactionId *)
palloc(sizeof(VirtualTransactionId) * arrayP->maxProcs);
@@ -3085,7 +3094,7 @@ GetVirtualXIDsDelayingChkpt(int *nvxids)
int pgprocno = arrayP->pgprocnos[index];
PGPROC *proc = &allProcs[pgprocno];
if (proc->delayChkpt)
if ((proc->delayChkpt & type) != 0)
{
VirtualTransactionId vxid;
@@ -3111,12 +3120,14 @@ GetVirtualXIDsDelayingChkpt(int *nvxids)
* those numbers should be small enough for it not to be a problem.
*/
bool
HaveVirtualXIDsDelayingChkpt(VirtualTransactionId *vxids, int nvxids)
HaveVirtualXIDsDelayingChkpt(VirtualTransactionId *vxids, int nvxids, int type)
{
bool result = false;
ProcArrayStruct *arrayP = procArray;
int index;
Assert(type != 0);
LWLockAcquire(ProcArrayLock, LW_SHARED);
for (index = 0; index < arrayP->numProcs; index++)
@@ -3127,7 +3138,8 @@ HaveVirtualXIDsDelayingChkpt(VirtualTransactionId *vxids, int nvxids)
GET_VXID_FROM_PGPROC(vxid, *proc);
if (proc->delayChkpt && VirtualTransactionIdIsValid(vxid))
if ((proc->delayChkpt & type) != 0 &&
VirtualTransactionIdIsValid(vxid))
{
int i;