1 files changed, 3 insertions, 53 deletions

diff --git a/storage/xtradb/row/row0umod.c b/storage/xtradb/row/row0umod.c
index 9597c476125..3c933c87b27 100644
--- a/storage/xtradb/row/row0umod.c
+++ b/storage/xtradb/row/row0umod.c
@@ -69,36 +69,6 @@ If you make a change in this module make sure that no codepath is
 introduced where a call to log_free_check() is bypassed. */
 
 /***********************************************************//**
-Checks if also the previous version of the clustered index record was
-modified or inserted by the same transaction, and its undo number is such
-that it should be undone in the same rollback.
-@return	TRUE if also previous modify or insert of this row should be undone */
-static
-ibool
-row_undo_mod_undo_also_prev_vers(
-/*=============================*/
-	undo_node_t*	node,	/*!< in: row undo node */
-	undo_no_t*	undo_no)/*!< out: the undo number */
-{
-	trx_undo_rec_t*	undo_rec;
-	trx_t*		trx;
-
-	trx = node->trx;
-
-	if (node->new_trx_id != trx->id) {
-
-		*undo_no = 0;
-		return(FALSE);
-	}
-
-	undo_rec = trx_undo_get_undo_rec_low(node->new_roll_ptr, node->heap);
-
-	*undo_no = trx_undo_rec_get_undo_no(undo_rec);
-
-	return(trx->roll_limit <= *undo_no);
-}
-
-/***********************************************************//**
 Undoes a modify in a clustered index record.
 @return	DB_SUCCESS, DB_FAIL, or error code: we may run out of file space */
 static
@@ -226,19 +196,11 @@ row_undo_mod_clust(
 	btr_pcur_t*	pcur;
 	mtr_t		mtr;
 	ulint		err;
-	ibool		success;
-	ibool		more_vers;
-	undo_no_t	new_undo_no;
 
 	ut_ad(node && thr);
 
 	log_free_check();
 
-	/* Check if also the previous version of the clustered index record
-	should be undone in this same rollback operation */
-
-	more_vers = row_undo_mod_undo_also_prev_vers(node, &new_undo_no);
-
 	pcur = &(node->pcur);
 
 	mtr_start(&mtr);
@@ -286,20 +248,6 @@ row_undo_mod_clust(
 
 	trx_undo_rec_release(node->trx, node->undo_no);
 
-	if (more_vers && err == DB_SUCCESS) {
-
-		/* Reserve the undo log record to the prior version after
-		committing &mtr: this is necessary to comply with the latching
-		order, as &mtr may contain the fsp latch which is lower in
-		the latch hierarchy than trx->undo_mutex. */
-
-		success = trx_undo_rec_reserve(node->trx, new_undo_no);
-
-		if (success) {
-			node->state = UNDO_NODE_PREV_VERS;
-		}
-	}
-
 	return(err);
 }
 
@@ -571,6 +519,7 @@ row_undo_mod_upd_del_sec(
 	ulint		err	= DB_SUCCESS;
 
 	ut_ad(node->rec_type == TRX_UNDO_UPD_DEL_REC);
+	ut_ad(!node->undo_row);
 	heap = mem_heap_create(1024);
 
 	while (node->index != NULL) {
@@ -632,6 +581,8 @@ row_undo_mod_del_mark_sec(
 	dict_index_t*	index;
 	ulint		err;
 
+	ut_ad(!node->undo_row);
+
 	heap = mem_heap_create(1024);
 
 	while (node->index != NULL) {
@@ -847,7 +798,6 @@ row_undo_mod_parse_undo_rec(
 	trx_undo_update_rec_get_update(ptr, clust_index, type, trx_id,
 				       roll_ptr, info_bits, trx,
 				       node->heap, &(node->update));
-	node->new_roll_ptr = roll_ptr;
 	node->new_trx_id = trx_id;
 	node->cmpl_info = cmpl_info;
 }