SET DEFAULT_STORAGE_ENGINE='tokudb';
drop table if exists t;
create table t (a int primary key, b int);
insert into t values (1,0);
set session transaction isolation level serializable;
begin;
select * from t where a=1 for update;
a	b
1	0
update t set b=b+1 where a=1;
connect conn1,localhost,root;
set session transaction isolation level serializable;
begin;
select * from t where a=1 for update;
connection default;
commit;
connection conn1;
a	b
1	1
update t set b=b+1 where a=1;
select * from t;
a	b
1	2
commit;
connection default;
disconnect conn1;
drop table t;