Add warning log for lost blocks
Add warning log for lost blocks

bluebore/dfs,yvxiang/dfs,linyvxiang/dfs,yvxiang/dfs,myawan/bfs-1,bluebore/bfs,lylei/dfs,bluebore/bfs,bluebore/dfs,lylei/dfs,yvxiang/coverage_for_bfs,yvxiang/coverage_for_bfs,myawan/bfs-1,lylei/dfs,yvxiang/coverage_for_bfs,baidu/bfs,baidu/bfs,linyvxiang/dfs,bluebore/bfs,myawan/bfs-1,bluebore/dfs,baidu/bfs,myawan/bfs-1,linyvxiang/dfs,baidu/bfs,yvxiang/dfs,yvxiang/dfs,lylei/dfs,yvxiang/coverage_for_bfs