1 files changed, 104 insertions, 45 deletions

diff --git a/storage/pbxt/src/xaction_xt.cc b/storage/pbxt/src/xaction_xt.cc
index 48abc5d2b66..c5f07eedabf 100644
--- a/storage/pbxt/src/xaction_xt.cc
+++ b/storage/pbxt/src/xaction_xt.cc
@@ -1287,27 +1287,61 @@ xtPublic xtBool xt_xn_begin(XTThreadPtr self)
 	return OK;
 }
 
-static xtBool xn_end_xact(XTThreadPtr thread, u_int status)
+static void xn_end_release_locks(XTThreadPtr thread)
+{
+	XTXactDataPtr	xact = thread->st_xact_data;
+	XTDatabaseHPtr	db = thread->st_database;
+	ASSERT_NS(xact);
+
+	/* {REMOVE-LOCKS} Drop locks if you have any: */
+	thread->st_lock_list.xt_remove_all_locks(db, thread);
+
+	/* Do this afterwards to make sure the sweeper
+	 * does not cleanup transactions start cleaning up
+	 * before any transactions that were waiting for
+	 * this transaction have completed!
+	 */
+	xact->xd_end_xn_id = db->db_xn_curr_id;
+
+	/* Now you can sweep! */
+	xact->xd_flags |= XT_XN_XAC_SWEEP;
+}
+
+/* The commit is split into two phases: one "fast" for MariaDB commit_ordered(),
+ * and one "slow" for commit(). When not using internal 2pc, there is only one
+ * call combining both phases.
+ */
+
+enum {
+	XN_END_PHASE_FAST = 1,
+	XN_END_PHASE_SLOW = 2,
+	XN_END_PHASE_BOTH = 3
+};
+
+static xtBool xn_end_xact(XTThreadPtr thread, u_int status, xtBool writer, int phase)
 {
 	XTXactDataPtr	xact;
 	xtBool			ok = TRUE;
+	xtBool			err;
 
 	ASSERT_NS(thread->st_xact_data);
 	if ((xact = thread->st_xact_data)) {
 		XTDatabaseHPtr	db = thread->st_database;
 		xtXactID		xn_id = xact->xd_start_xn_id;
-		xtBool			writer;
 		
-		if ((writer = thread->st_xact_writer)) {
+		if (writer) {
 			/* The transaction wrote something: */
 			XTXactEndEntryDRec	entry;
 			xtWord4				sum;
 
-			sum = XT_CHECKSUM4_XACT(xn_id) ^ XT_CHECKSUM4_XACT(0);
-			entry.xe_status_1 = status;
-			entry.xe_checksum_1 = XT_CHECKSUM_1(sum);
-			XT_SET_DISK_4(entry.xe_xact_id_4, xn_id);
-			XT_SET_DISK_4(entry.xe_not_used_4, 0);
+			if (phase & XN_END_PHASE_FAST)
+			{
+				sum = XT_CHECKSUM4_XACT(xn_id) ^ XT_CHECKSUM4_XACT(0);
+				entry.xe_status_1 = status;
+				entry.xe_checksum_1 = XT_CHECKSUM_1(sum);
+				XT_SET_DISK_4(entry.xe_xact_id_4, xn_id);
+				XT_SET_DISK_4(entry.xe_not_used_4, 0);
+			}
 
 #ifdef XT_IMPLEMENT_NO_ACTION
 			/* This will check any resticts that have been delayed to the end of the statement. */
@@ -1319,20 +1353,35 @@ static xtBool xn_end_xact(XTThreadPtr thread, u_int status)
 			}
 #endif
 
-			/* Flush the data log: */
-			if (!thread->st_dlog_buf.dlb_flush_log(TRUE, thread)) {
+			/* Flush the data log (in the "fast" case we already did it in prepare: */
+			if ((phase & XN_END_PHASE_SLOW) && !thread->st_dlog_buf.dlb_flush_log(TRUE, thread)) {
 				ok = FALSE;
 				status = XT_LOG_ENT_ABORT;
 			}
 
 			/* Write and flush the transaction log: */
-			if (!xt_xlog_log_data(thread, sizeof(XTXactEndEntryDRec), (XTXactLogBufferDPtr) &entry, xt_db_flush_log_at_trx_commit)) {
+			if (phase == XN_END_PHASE_FAST) {
+				/* Fast phase, delay any write or flush to later. */
+				err = !xt_xlog_log_data(thread, sizeof(XTXactEndEntryDRec), (XTXactLogBufferDPtr) &entry, XT_XLOG_NO_WRITE_NO_FLUSH);
+			} else if (phase == XN_END_PHASE_SLOW) {
+				/* We already appended the commit record in the fast phase.
+				 * Now just call with empty record to ensure we write/flush
+				 * the log as needed for this commit.
+				 */
+				err = !xt_xlog_log_data(thread, 0, NULL, xt_db_flush_log_at_trx_commit);
+			} else /* phase == XN_END_PHASE_BOTH */ {
+				/* Both phases at once, append commit record and write/flush normally. */
+				ASSERT_NS(phase == XN_END_PHASE_BOTH);
+				err = !xt_xlog_log_data(thread, sizeof(XTXactEndEntryDRec), (XTXactLogBufferDPtr) &entry, xt_db_flush_log_at_trx_commit);
+			}
+
+			if (err) {
 				ok = FALSE;
 				status = XT_LOG_ENT_ABORT;
 				/* Make sure this is done, if we failed to log
 				 * the transction end!
 				 */
-				if (thread->st_xact_writer) {
+				if (writer) {
 					/* Adjust this in case of error, but don't forget
 					 * to lock!
 					 */
@@ -1347,46 +1396,46 @@ static xtBool xn_end_xact(XTThreadPtr thread, u_int status)
 				}
 			}
 
-			/* Setting this flag completes the transaction,
-			 * Do this before we release the locks, because
-			 * the unlocked transactions expect the
-			 * transaction they are waiting for to be
-			 * gone!
-			 */
-			xact->xd_end_time = ++db->db_xn_end_time;
-			if (status == XT_LOG_ENT_COMMIT) {
-				thread->st_statistics.st_commits++;
-				xact->xd_flags |= (XT_XN_XAC_COMMITTED | XT_XN_XAC_ENDED);
-			}
-			else {
-				thread->st_statistics.st_rollbacks++;
-				xact->xd_flags |= XT_XN_XAC_ENDED;
+			if (phase & XN_END_PHASE_FAST) {
+				/* Setting this flag completes the transaction,
+				 * Do this before we release the locks, because
+				 * the unlocked transactions expect the
+				 * transaction they are waiting for to be
+				 * gone!
+				 */
+				xact->xd_end_time = ++db->db_xn_end_time;
+				if (status == XT_LOG_ENT_COMMIT) {
+					thread->st_statistics.st_commits++;
+					xact->xd_flags |= (XT_XN_XAC_COMMITTED | XT_XN_XAC_ENDED);
+				}
+				else {
+					thread->st_statistics.st_rollbacks++;
+					xact->xd_flags |= XT_XN_XAC_ENDED;
+				}
 			}
 
-			/* {REMOVE-LOCKS} Drop locks is you have any: */
-			thread->st_lock_list.xt_remove_all_locks(db, thread);
-
-			/* Do this afterwards to make sure the sweeper
-			 * does not cleanup transactions start cleaning up
-			 * before any transactions that were waiting for
-			 * this transaction have completed!
+			/* Be as fast as possible in the "fast" path, as we want to be as
+			 * fast as possible here (we will release slow locks immediately
+			 * after in the "slow" part).
+			 * ToDo: If we ran the fast part, the slow part could release locks
+			 * _before_ fsync(), rather than after.
 			 */
-			xact->xd_end_xn_id = db->db_xn_curr_id;
+			if (!(phase & XN_END_PHASE_SLOW))
+				return ok;
 
-			/* Now you can sweep! */
-			xact->xd_flags |= XT_XN_XAC_SWEEP;
+			xn_end_release_locks(thread);
 		}
 		else {
 			/* Read-only transaction can be removed, immediately */
-			xact->xd_end_time = ++db->db_xn_end_time;
-			xact->xd_flags |= (XT_XN_XAC_COMMITTED | XT_XN_XAC_ENDED);
-
-			/* Drop locks is you have any: */
-			thread->st_lock_list.xt_remove_all_locks(db, thread);
+			if (phase & XN_END_PHASE_FAST) {
+				xact->xd_end_time = ++db->db_xn_end_time;
+				xact->xd_flags |= (XT_XN_XAC_COMMITTED | XT_XN_XAC_ENDED);
 
-			xact->xd_end_xn_id = db->db_xn_curr_id;
+				if (!(phase & XN_END_PHASE_SLOW))
+					return ok;
+			}
 
-			xact->xd_flags |= XT_XN_XAC_SWEEP;
+			xn_end_release_locks(thread);
 
 			if (xt_xn_delete_xact(db, xn_id, thread)) {
 				if (db->db_xn_min_ram_id == xn_id)
@@ -1478,12 +1527,22 @@ static xtBool xn_end_xact(XTThreadPtr thread, u_int status)
 
 xtPublic xtBool xt_xn_commit(XTThreadPtr thread)
 {
-	return xn_end_xact(thread, XT_LOG_ENT_COMMIT);
+	return xn_end_xact(thread, XT_LOG_ENT_COMMIT, thread->st_xact_writer, XN_END_PHASE_BOTH);
+}
+
+xtPublic xtBool xt_xn_commit_fast(XTThreadPtr thread, xtBool writer)
+{
+	return xn_end_xact(thread, XT_LOG_ENT_COMMIT, writer, XN_END_PHASE_FAST);
+}
+
+xtPublic xtBool xt_xn_commit_slow(XTThreadPtr thread, xtBool writer)
+{
+	return xn_end_xact(thread, XT_LOG_ENT_COMMIT, writer, XN_END_PHASE_SLOW);
 }
 
 xtPublic xtBool xt_xn_rollback(XTThreadPtr thread)
 {
-	return xn_end_xact(thread, XT_LOG_ENT_ABORT);
+	return xn_end_xact(thread, XT_LOG_ENT_ABORT, thread->st_xact_writer, XN_END_PHASE_BOTH);
 }
 
 xtPublic xtBool xt_xn_log_tab_id(XTThreadPtr self, xtTableID tab_id)