06-26-2017 02:15 AM
I have a question about this subject. ( I know this is pretty old issue ... )
I'm using namenode HA(QJM). And for more redundancy, I set "dfs.namenode.name.dir" to multiple directories and one of them is a nfs mounted on other server( especially on master node ).
But in this post and on the Cloudera's deploying guide site( https://www.cloudera.com/documentation/enterprise/5-4-x/topics/cdh_ig_hdfs_cluster_deploy.html ), they say "If you are using HA, you should not configure these directories on an NFS mount".
Why Cloudera says that?
Is it just "no more required" NFS under HA?
or Is there any potential problem using NFS directory under HA?