add join_process
add join_process
add random partitioner
refactor:log message
fix:Starting and stopping timing of cleanup process
refactor:Unused code deleted.
refactor:Starting and stopping timing of cleanup process.
Merge branch 'master' into part
Merge branch 'spushv' into part

Conflicts:
	ruby/server/lib/roma/stats.rb
refactor:Use the __method__ in log messages.
refactor:Delete a unused method.
refactor:Add new functions.
fix:run_iterate_storage flag is used in one thread.
Delete a deprecated option and method in recover command.
Merge branch 'spushv' into part
fix:Protects the 'reqpushv' request in the join process.
refactor:Add alias.
Add recover function in the partitioner module.
refactor:join process
refactor:for release process