[hadoop] hadoop namenode format 格式化 hdfs / 重置 hdfs 空間
安裝 hadoop hdfs 重要的一步就是 namenode format ，如果檔案損毀想要放棄 測試用的cluster 或是重置所有的資料，也可以使用 hadoop namenode format
"The first step to starting up your Hadoop installation is formatting the Hadoop filesystem, which is implemented on top of the local filesystems of your cluster. You need to do this the first time you set up a Hadoop installation. Do not format a running Hadoop filesystem, this will cause all your data to be erased."
先切換 成 hdfs user
一般來說是用 hdfs 去建立相關的資料夾
su hdfs
% $HADOOP_INSTALL/hadoop/bin/hadoop namenode -format
GettingStartedWithHadoop - Hadoop Wiki
https://wiki.apache.org/hadoop/GettingStartedWithHadoop#Formatting_the_Namenode
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