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Mon, 23 Mar 2026 04:47:27 -0700 (PDT) MIME-Version: 1.0 From: Nikhil Chawla Date: Mon, 23 Mar 2026 17:17:15 +0530 X-Gm-Features: AaiRm52Y_aY-bKbPxr33dR1CupUQGNFgH72FUt_Ydo9pHMWXhupY4ZIWRT1YebQ Message-ID: Subject: [PATCH] Add prepared_orphaned_transaction_timeout GUC To: pgsql-hackers@lists.postgresql.org Content-Type: multipart/mixed; boundary="00000000000050b70f064daf9921" List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --00000000000050b70f064daf9921 Content-Type: multipart/alternative; boundary="00000000000050b70e064daf991f" --00000000000050b70e064daf991f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, Orphaned prepared transactions cause escalating harm the longer they persist: 1. *Lock retention* : All locks (row-level, table-level, advisory) acquired during the transaction are held indefinitely, blocking concurre= nt DML and DDL 2. *VACUUM blockage :* The prepared transaction's XID becomes the oldest running transaction, preventing VACUUM from freezing tuples or reclaimin= g dead rows across the entire cluster, leading to table and index bloat 3. *Transaction ID wraparound risk *: In extreme cases, the frozen XID horizon cannot advance, eventually threatening XID wraparound shutdown 4. *Resource consumption *: Shared memory slots (max_prepared_transactions) remain occupied; the WAL records for the prepared state persist Today, the only remediation is manual intervention: a DBA must discover the orphan (via pg_prepared_xacts), determine it's truly abandoned, and issue ROLLBACK PREPARED. PostgreSQL already has timeout-based safety nets for other "stuck" session states such as, idle_in_transaction_session_timeout, idle_session_timeout, statement_timeout, but no equivalent for prepared transactions. This patch fills that gap. *How it works ?* CleanupOrphanedPreparedTransactions(): Phase 1 =E2=80=94 Collect candidates (under TwoPhaseStateLock, shared mod= e): for each GlobalTransactionData (gxact) in TwoPhaseState: if gxact->valid AND TimestampDifferenceExceeds(gxact->prepared_at, now, timeout): save gxact->gid to candidate list Phase 2 =E2=80=94 Roll back each candidate (lock released): for each saved GID: lock =3D LockGXactForCleanup(gid) if lock succeeded: FinishPreparedTransaction(gid, isCommit=3Dfalse) log: "rolling back orphaned prepared transaction %s" *Safety Properties* 1. Timeout =3D 0 (default): Feature is completely disabled, no behavior change from default PostgreSQL 2. No false positives on active transactions: The check uses prepared_at, which is set once at PREPARE TRANSACTION time. A transactio= n that is actively being committed/rolled back by a client will either complete before the timeout or be skipped by LockGXactForCleanup (which returns NULL if the gxact is already locked by another backend) 3. Crash-safe: If the checkpointer crashes during cleanup, the prepared transaction's WAL state is unchanged, it remains prepared and will be cleaned up after recovery 4. Idempotent: If the GID was already resolved between Phase 1 and Phase 2, LockGXactForCleanup returns NULL and the cleanup is silently skipped --=20 Regards, Nikhil Chawla Twitter | LinkedIn --00000000000050b70e064daf991f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

Orphaned prepared transactions cause escal= ating harm the longer they persist:

  1. Lock retention=C2= =A0:=C2=A0 All locks (row-level, table-level, advisory) acquired during the= transaction are held indefinitely, blocking concurrent DML and DDL
    2. VACUUM blockage :=C2=A0The prepared transaction's XID becomes t= he oldest running transaction, preventing VACUUM from freezing tuples or re= claiming dead rows across the entire cluster, leading to table and index bl= oat
  2. Transaction ID wraparound risk : In extreme cases, the f= rozen XID horizon cannot advance, eventually threatening XID wraparound shu= tdown
  3. Resource consumption : Shared memory slots (max_prepar= ed_transactions) remain occupied; the WAL records for the prepared state pe= rsist
Today, the only remediation is manual intervention: a DBA mu= st discover the orphan (via pg_prepared_xacts), determine it's truly ab= andoned, and issue ROLLBACK PREPARED. PostgreSQL already has timeout-based = safety nets for other "stuck" session states such as, idle_in_tra= nsaction_session_timeout, idle_session_timeout, statement_timeout, but no e= quivalent for prepared transactions. This patch fills that gap.

<= b>How it works ?


CleanupOrphanedPreparedTransactions():<= br>
=C2=A0 Phase 1 =E2=80=94 Collect candidates (under TwoPhaseStateLock= , shared mode):
=C2=A0 =C2=A0 for each GlobalTransactionData (gxact) in = TwoPhaseState:
=C2=A0 =C2=A0 =C2=A0 if gxact->valid AND
=C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0TimestampDifferenceExceeds(gxact->prepared_at, n= ow, timeout):
=C2=A0 =C2=A0 =C2=A0 =C2=A0 save gxact->gid to candidat= e list

=C2=A0 Phase 2 =E2=80=94 Roll back each candidate (lock relea= sed):
=C2=A0 =C2=A0 for each saved GID:
=C2=A0 =C2=A0 =C2=A0 lock =3D= LockGXactForCleanup(gid)
=C2=A0 =C2=A0 =C2=A0 if lock succeeded:
=C2= =A0 =C2=A0 =C2=A0 =C2=A0 FinishPreparedTransaction(gid, isCommit=3Dfalse)=C2=A0 =C2=A0 =C2=A0 =C2=A0 log: "rolling back orphaned prepared tra= nsaction %s"

Safety Properties

  1. Tim= eout =3D 0 (default): Feature is completely disabled, no behavior change fr= om default PostgreSQL
  2. No false positives on active transactions: Th= e check uses prepared_at, which is set once at PREPARE TRANSACTION time. A = transaction that is actively being committed/rolled back by a client will e= ither complete before the timeout or be skipped by LockGXactForCleanup (whi= ch returns NULL if the gxact is already locked by another backend)
  3. = Crash-safe: If the checkpointer crashes during cleanup, the prepared transa= ction's WAL state is unchanged, it remains prepared and will be cleaned= up after recovery
  4. Idempotent: If the GID was already resolved betw= een Phase 1 and Phase 2, LockGXactForCleanup returns NULL and the cleanup i= s silently skipped

--
Regards,
Nikhil Chawla

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