test flush on replace
1	s1
2	s2
3	s3
exception on create and fill
0
1	1	s1
2	2	s2
3	3	s3
1	1	s1
2	2	s2
3	3	s3
1	1	s1
2	2	s2
3	3	s3
4	4	s4
buf
dist
join
t