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Posted to hdfs-user@hadoop.apache.org by Shengdi Jin <ji...@gmail.com> on 2015/03/03 20:57:02 UTC
configure a backup namenode
Hi all,
I have a small cluster with one namenode1 and one datanode.
I want to configure another namenode2 to replace the namenode1 by only
replicating the files in namenode directory of namenode1 to namenode2 and
changing IP of namenode2 to namenode1's.
I tried this, the replacing namenode2 can work with datanode, like
start/stop hdfs, create directory, delete directory, a new mapreduce job....
But when I want to check the directories and files created by namenode1,
nothing found.
So i suspect that the blocking-mapping information is not included in
namenode directory of namenode1.
Am I right? Does anyone know how the namenode manages the mapping block
information. Please give me some ideas.
If I am wrong. Please correct me. Thanks a looooooot.
Shengdi