tree 548266989acdf15468330072d433070f89f3ee1d
parent 0b7cb5f02bdf4d185c6b123b49a8a14f06d9735d
author Chaoyi Bian <bcy@pku.edu.cn> 1333491710 -0700
committer Chaoyi Bian <bcy@pku.edu.cn> 1333491710 -0700

correct two logic:
when oldSeq.session != newSeq.session, fetch from 0
when found seq's session != current session, return seq as 0