TODO List

[lylei]

1. Logging.h按时间&大小切log
   Logging.h switch file when the file reach a size limit
2. 多盘负载均衡
   Load balance between disks
3. 异构机器调度
   Load balance between different server type(disk number, etc)
4. 机架感知
   rack recognize
5. chunkserver停机dump数据
   chunk server should close opened files before shutdown
6. sdk端sync支持超时
   sdk support sync timeout
7. 副本恢复与gc逻辑使用后台扫描触发
   background gc and replica recover strategy
8. SDK里File结构的生命周期管理
   Managing file cycle for files in sdk
9. 统一SDK里两个CloseFile逻辑
   There are tow CloseFile in SDK.
10. webservice实现剥离出nameserver_impl
    Separate web service from Nameserver_impl
11. 错误码，人性化报错
    Make error code readable
12. 读写文件优先选择Client本地副本
    Read/write local copy first
13. Nameserver high availablity
14. 文件锁
    File lock
15. 拆分metaserver
    Separate Metaserver from Nameserver
16. Fuse LowLevel implementation
17. 大文件分块
    Supporting huge file
18. 多用户
    Multi user support. Access & quota control
19. 文档完善
    Documentation
20. 测试完善
    Unit test, functional test, integration test
21. docker 支持
    Docker image
22. benchmark
23. 单CS挂机不影响写入
    Single CS down should not infect writing
24. Load Balance: for new blocks & old blocks
25. SDK lease
26. RS encode