I am considering to use a machine to save a
redundant copy of HDFS metadata through setting dfs.name.dir in hdfs-site.xml
like this (as in YDN):
<property>
<name>dfs.name.dir</name>
<value>/home/hadoop/dfs/name,/mnt/namenode-backup</value>
<final>true</final>
</property>
where the two folders are on different machines so that /mnt/namenode-backup
keeps a copy of hdfs file system information and its machine can be used to
replace the first machine that fails as namenode.
So, my question is how big this hdfs metatdata will consume? I guess it is
proportional to the hdfs capacity. What ratio is that or what size will be for
150TB hdfs?
Thanks,
Michael
