How do I switch HDFS to using Quorum based storage?

[#1]

I installed a Cloudera Hadoop cluster last week, and shifted HDFS to high availability via it's automated "Enable High Availability" button. Now it's giving me the warning message "HDFS High Availability using shared NFS mounts is not supported with CDH 5.0 and later versions. You..."

I can't find any documentation on how I might go about this. It all seems to assume that it was done correctly when the system did the conversion. How can I fix this?

[#2 · Accepted solution]

This turned out to be a configuration setting issue.

"dfs.namenode.shared.edits.dir" had a directory value in it, and needed to be cleared.