https://docs.cloudera.com/documentation/enterprise/6/latest/topics/cdh_hag_hdfs_ha_config.html
after opening high availability, need to modify the place
1.hive all related services must be completely shut down, and then update the Hive Metastore Namenode, then restart
If you open the hive on spark, no update Hive Metastore Namenode, will be reported the following error
delegation token can be issued only with kerberos or web authentication
2. Install HttpFS
After installation, do not forget kerberos credentials generated HttpFS, otherwise start unsuccessful
steps: Administration -> Security -> Kerberos credentials -> Generate missing credentials
3.Hue
will serve Hue Hue role of HDFS Web interface configured to HTTPFS role, rather than NameNode
