Pread chose random chunkserver
Pread chose random chunkserver

yvxiang/dfs,yvxiang/coverage_for_bfs,lylei/dfs,baidu/bfs,bluebore/dfs,lylei/dfs,myawan/bfs-1,lylei/dfs,bluebore/bfs,myawan/bfs-1,yvxiang/dfs,bluebore/bfs,lylei/dfs,bluebore/bfs,linyvxiang/dfs,yvxiang/dfs,baidu/bfs,linyvxiang/dfs,imotai/bfs,bluebore/dfs,bluebore/dfs,yvxiang/coverage_for_bfs,imotai/bfs,00k/ToyDFS,yvxiang/coverage_for_bfs,baidu/bfs,yvxiang/coverage_for_bfs,myawan/bfs-1,imotai/bfs,baidu/bfs,00k/ToyDFS,myawan/bfs-1,yvxiang/dfs,linyvxiang/dfs