23. 系统的三个部分
client library
master server
many tablet servers(可以动态增加)
24. master的功能
assign tablets to table servers(负载均衡)
detecting the addition and expiration of table
server
(table server的动态增减)
balancing the tablet-server load
garbage collection of files in GFS
(不知道具体指什么)
handle schema changes such as table and column
faimily creations
25. tablet server的功能
管理一系列tablet, 10~1000个
handle read and write requst to
the tablets
splits tablets that have grown too
large