tree 4120b58cab527a85d3d87ff9c66a9df5863ed004
parent ee5c90fe54c40cd9fe4dff22446e8c887d0b7b6c
author Zhenkai Zhu <zhenkai@cs.ucla.edu> 1348788620 -0700
committer Zhenkai Zhu <zhenkai@cs.ucla.edu> 1348788812 -0700

check and update roster