Hadoop如何修改HDFS文件存储块大小

一、 临时修改可以在执行上传文件命令时，显示地指定存储的块大小。1. 查看当前 HDFS文件块大小我这里查看HDFS上的TEST目录下的jdk-7u25-linux-x64.gz 文件存储块大小。1.1 终端命令方式查看[xiaoyu@hadoop02 hadoop-1.1.2]$ ./bin/hadoop fs -stat "%o" TEST/jdk-7u25-linux-x64.gz
51200单位为B（字节）1.2 或页面方式查看打开haddop datanode节点的hdfs监控页面：http://hadoop01:50070



如下所示：




二、永久修改这个需要修改hdfs-site.conf配置文件，增加全局参数dfs.block.size。如下：修改后参数



把配置同步到其它节点，并重启hdfs。[xiaoyu@hadoop02 hadoop-1.1.2]$ bin/stop-dfs.sh
no namenode to stop
hadoop02: stopping datanode
hadoop01: stopping secondarynamenode
[xiaoyu@hadoop02 hadoop-1.1.2]$ bin/start-dfs.sh
starting namenode, logging to /home/xiaoyu/hadoop-1.1.2/libexec/../logs/hadoop-xiaoyu-namenode-hadoop02.out
hadoop02: starting datanode, logging to /home/xiaoyu/hadoop-1.1.2/libexec/../logs/hadoop-xiaoyu-datanode-hadoop02.out
hadoop01: starting secondarynamenode, logging to /home/xiaoyu/hadoop-1.1.2/libexec/../logs/hadoop-xiaoyu-secondarynamenode-hadoop01.out重新查看TEST/jdk-7u25-linux-x64.gz 文件存储的块大小：



重新上传文件到HDFS，并重命名为 比较用_jdk-7u25-linux-x64.gz



参考资料：http://hadoop.apache.org/docs/r0.18.3/cluster_setup.html#Configuration