http://hadoop.apache.org/docs/r1.0.4/cn/hdfs_design.html
http://www.cnblogs.com/cloudma/articles/hadoop-block.html
https://yq.aliyun.com/wenji/76170
http://hadoop.apache.org/docs/r1.0.4/cn/hdfs_design.html
http://www.cnblogs.com/cloudma/articles/hadoop-block.html
https://yq.aliyun.com/wenji/76170