log_lock_waits = on
deadlock_timeout = 1s

$ ag_ctl stop
waiting for server to shut down.... done
server stopped
$ ag_ctl start
server starting

agens=# begin;
BEGIN
agens=# create (:n{id:1});
GRAPH WRITE (INSERT VERTEX 1, INSERT EDGE 0)
agens=# rollback;
ROLLBACK
agens=#

agens=# create (:n{id:1});
GRAPH WRITE (INSERT VERTEX 1, INSERT EDGE 0)

LOG:  process 3908 still waiting for ShareLock on transaction 1586 after 1001.058 ms
DETAIL:  Process holding the lock: 3906. Wait queue: 3908.
CONTEXT:  while inserting index tuple (0,7) in relation "n_id_idx"
STATEMENT:  create (:n{id:1});
LOG:  process 3908 acquired ShareLock on transaction 1586 after 4639.630 ms
CONTEXT:  while inserting index tuple (0,7) in relation "n_id_idx"
STATEMENT:  create (:n{id:1});