Meta server: fix user and group initial set parameters result propagation; implement “is update pending" method with user and group class. Implement meta server admin and stats user and group parameter setting. Use these user and groups id lists to control access to meta server administration (fsck, chunk server retire, etc), and status reporting (stats, ping, etc) RPCs. Always schedule admin and stats user and group id lists update after user and group update completion to ensure that the possible changes in user and group mapping are in effect, prevent possible spurious invalid user and group id list updates.