4：

R_I ← R_I ∪ p_r

5：

end for

6：

for i = (ζ ∗ α + 1) to ζ do

7：

select p_r from online peer set randomly

8：

R_II ← R_II ∪ p_r

9：

end for

10：

filter peers which experienced some content fetching failure in R_I , R_II , respectively

11：

filter peers whose workload exceed the threshold γ in R_I , R_II , respectively

12：

sort R_I , R_II in descending order of τ_i

13：

R ← R_I ∪ R_II

14：

return R

15：

end procedure