diff --git a/src/test/regress/expected/isolation_add_remove_node.out b/src/test/regress/expected/isolation_add_remove_node.out
index e5f583bd0..e6d03b1a4 100644
--- a/src/test/regress/expected/isolation_add_remove_node.out
+++ b/src/test/regress/expected/isolation_add_remove_node.out
@@ -31,6 +31,41 @@ nodename       nodeport       isactive
 master_remove_node
 
 
+starting permutation: s1-begin s1-add-node-1 s2-add-node-2 s1-commit s1-show-nodes
+?column?       
+
+1              
+step s1-begin: 
+	BEGIN;
+
+step s1-add-node-1: 
+	SELECT 1 FROM master_add_node('localhost', 57637);
+
+?column?       
+
+1              
+step s2-add-node-2: 
+	SELECT 1 FROM master_add_node('localhost', 57638);
+ <waiting ...>
+step s1-commit: 
+	COMMIT;
+
+step s2-add-node-2: <... completed>
+?column?       
+
+1              
+step s1-show-nodes: 
+	SELECT nodename, nodeport, isactive FROM pg_dist_node ORDER BY nodename, nodeport;
+
+nodename       nodeport       isactive       
+
+localhost      57637          t              
+localhost      57638          t              
+master_remove_node
+
+               
+               
+
 starting permutation: s1-begin s1-add-node-1 s2-add-node-1 s1-commit s1-show-nodes
 ?column?       
 
@@ -64,7 +99,40 @@ master_remove_node
 
                
 
-starting permutation: s1-begin s1-add-node-1 s2-add-node-1 s1-commit s1-show-nodes
+starting permutation: s1-begin s1-add-node-1 s2-add-node-2 s1-abort s1-show-nodes
+?column?       
+
+1              
+step s1-begin: 
+	BEGIN;
+
+step s1-add-node-1: 
+	SELECT 1 FROM master_add_node('localhost', 57637);
+
+?column?       
+
+1              
+step s2-add-node-2: 
+	SELECT 1 FROM master_add_node('localhost', 57638);
+ <waiting ...>
+step s1-abort: 
+	ABORT;
+
+step s2-add-node-2: <... completed>
+?column?       
+
+1              
+step s1-show-nodes: 
+	SELECT nodename, nodeport, isactive FROM pg_dist_node ORDER BY nodename, nodeport;
+
+nodename       nodeport       isactive       
+
+localhost      57638          t              
+master_remove_node
+
+               
+
+starting permutation: s1-begin s1-add-node-1 s2-add-node-1 s1-abort s1-show-nodes
 ?column?       
 
 1              
@@ -80,8 +148,8 @@ step s1-add-node-1:
 step s2-add-node-1: 
 	SELECT 1 FROM master_add_node('localhost', 57637);
  <waiting ...>
-step s1-commit: 
-	COMMIT;
+step s1-abort: 
+	ABORT;
 
 step s2-add-node-1: <... completed>
 ?column?       
@@ -486,3 +554,81 @@ localhost      57637          f
 master_remove_node
 
                
+
+starting permutation: s1-add-inactive-1 s1-begin s1-activate-node-1 s2-disable-node-1 s1-abort s1-show-nodes
+?column?       
+
+1              
+step s1-add-inactive-1: 
+	SELECT 1 FROM master_add_inactive_node('localhost', 57637);
+
+?column?       
+
+1              
+step s1-begin: 
+	BEGIN;
+
+step s1-activate-node-1: 
+	SELECT 1 FROM master_activate_node('localhost', 57637);
+
+?column?       
+
+1              
+step s2-disable-node-1: 
+	SELECT 1 FROM master_disable_node('localhost', 57637);
+ <waiting ...>
+step s1-abort: 
+	ABORT;
+
+step s2-disable-node-1: <... completed>
+?column?       
+
+1              
+step s1-show-nodes: 
+	SELECT nodename, nodeport, isactive FROM pg_dist_node ORDER BY nodename, nodeport;
+
+nodename       nodeport       isactive       
+
+localhost      57637          f              
+master_remove_node
+
+               
+
+starting permutation: s1-add-node-1 s1-begin s1-disable-node-1 s2-disable-node-1 s1-abort s1-show-nodes
+?column?       
+
+1              
+step s1-add-node-1: 
+	SELECT 1 FROM master_add_node('localhost', 57637);
+
+?column?       
+
+1              
+step s1-begin: 
+	BEGIN;
+
+step s1-disable-node-1: 
+	SELECT 1 FROM master_disable_node('localhost', 57637);
+
+?column?       
+
+1              
+step s2-disable-node-1: 
+	SELECT 1 FROM master_disable_node('localhost', 57637);
+ <waiting ...>
+step s1-abort: 
+	ABORT;
+
+step s2-disable-node-1: <... completed>
+?column?       
+
+1              
+step s1-show-nodes: 
+	SELECT nodename, nodeport, isactive FROM pg_dist_node ORDER BY nodename, nodeport;
+
+nodename       nodeport       isactive       
+
+localhost      57637          f              
+master_remove_node
+
+               
diff --git a/src/test/regress/expected/isolation_distributed_transaction_id.out b/src/test/regress/expected/isolation_distributed_transaction_id.out
index 823b9b049..0c4c2584b 100644
--- a/src/test/regress/expected/isolation_distributed_transaction_id.out
+++ b/src/test/regress/expected/isolation_distributed_transaction_id.out
@@ -98,7 +98,7 @@ step s1-get-current-transaction-id:
 
 row            
 
-(0,189)        
+(0,279)        
 step s2-get-first-worker-active-transactions: 
 		SELECT * FROM run_command_on_workers('SELECT row(initiator_node_identifier, transaction_number)
 												FROM	 
@@ -109,4 +109,4 @@ step s2-get-first-worker-active-transactions:
 
 nodename       nodeport       success        result         
 
-localhost      57637          t              (0,189)        
+localhost      57637          t              (0,279)        
diff --git a/src/test/regress/specs/isolation_add_remove_node.spec b/src/test/regress/specs/isolation_add_remove_node.spec
index a164cdb96..348553a08 100644
--- a/src/test/regress/specs/isolation_add_remove_node.spec
+++ b/src/test/regress/specs/isolation_add_remove_node.spec
@@ -50,6 +50,11 @@ step "s1-remove-node-2"
 	SELECT * FROM master_remove_node('localhost', 57638);
 }
 
+step "s1-abort"
+{
+	ABORT;
+}
+
 step "s1-commit"
 {
 	COMMIT;
@@ -105,9 +110,14 @@ step "s2-commit"
 # session 1 adds a node, session 2 removes it, should be ok
 permutation "s1-begin" "s1-add-node-1" "s2-remove-node-1" "s1-commit" "s1-show-nodes"
 # add a different node from 2 sessions, should be ok
-permutation "s1-begin" "s1-add-node-1" "s2-add-node-1" "s1-commit" "s1-show-nodes"
+permutation "s1-begin" "s1-add-node-1" "s2-add-node-2" "s1-commit" "s1-show-nodes"
 # add the same node from 2 sessions, should be ok (idempotent)
 permutation "s1-begin" "s1-add-node-1" "s2-add-node-1" "s1-commit" "s1-show-nodes"
+# add a different node from 2 sessions, one aborts
+permutation "s1-begin" "s1-add-node-1" "s2-add-node-2" "s1-abort" "s1-show-nodes"
+# add the same node from 2 sessions, one aborts
+permutation "s1-begin" "s1-add-node-1" "s2-add-node-1" "s1-abort" "s1-show-nodes"
+
 # remove a different node from 2 transactions, should be ok
 permutation "s1-add-node-1" "s1-add-node-2" "s1-begin" "s1-remove-node-1" "s2-remove-node-2" "s1-commit" "s1-show-nodes"
 # remove the same node from 2 transactions, should be ok (idempotent)
@@ -132,3 +142,8 @@ permutation "s1-add-node-1" "s1-begin" "s1-activate-node-1" "s2-disable-node-1"
 permutation "s1-add-inactive-1" "s1-begin" "s1-disable-node-1" "s2-activate-node-1" "s1-commit" "s1-show-nodes"
 # activate and disable an inactive node node from 2 transactions, should be ok
 permutation "s1-add-inactive-1" "s1-begin" "s1-activate-node-1" "s2-disable-node-1" "s1-commit" "s1-show-nodes"
+
+# activate and disable an inactive node from 2 transactions, one aborts
+permutation "s1-add-inactive-1" "s1-begin" "s1-activate-node-1" "s2-disable-node-1" "s1-abort" "s1-show-nodes"
+# disable an active node from 2 transactions, one aborts
+permutation "s1-add-node-1" "s1-begin" "s1-disable-node-1" "s2-disable-node-1" "s1-abort" "s1-show-nodes"